To all our customers
Regarding the change of names mentioned in the document, such as Mitsubishi
Electric and Mitsubishi XX, to Renesas Technology Corp.
The semiconductor operations of Hitachi and Mitsubishi Electric were transferred to Renesas
Technology Corporation on April 1st 2003. These operations include microcomputer, logic, analog
and discrete devices, and memory chips other than DRAMs (flash memory, SRAMs etc.)
Accordingly, although Mitsubishi Electric, Mitsubishi Electric Corporation, Mitsubishi
Semiconductors, and other Mitsubishi brand names are mentioned in the document, these names
have in fact all been changed to Renesas Technology Corp. Thank you for your understanding.
Except for our corporate trademark, logo and corporate statement, no changes whatsoever have been
made to the contents of the document, and these changes do not constitute any alteration to the
contents of the document itself.
Note : Mitsubishi Electric will continue the business operations of high frequency & optical devices
and power devices.
Renesas Technology Corp.
Customer Support Dept.
April 1, 2003
MITSUBISHI MICROCOMPUTERS
A
IMIN
RY M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
.
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PRE
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
DESCRIPTION
These are single-chip 16-bit microcomputers designed with high-performance CMOS silicon gate technology, being packaged in 42-pin
plastic molded SSOP or shrink plastic molded DIP. These microcomputers support the 7900 Series instruction set, which are enhanced
and expanded instruction set and are upper-compatible with the
7700/7751 Series instruction set.
The CPU of these microcomputers is a 16-bit parallel processor that
can also be switched to perform 8-bit parallel processing. Also, the
bus interface unit of these microcomputers enhances the memory
access efficiency to execute instructions fast. Therefore, these microcomputers are suitable for office, business, and industrial equipment controller that require high-speed processing of large data.
Also, they are suitable for motor-control equipment since each of
them includes the motor control circuit.
DISTINCTIVE FEATURES
• Number of basic machine instructions .................................... 203
• Memory
[M37906M4C-XXXFP, M37906M4C-XXXSP]
[M37906M4H-XXXFP, M37906M4H-XXXSP] (Note)
ROM .............................................................................. 32 Kbytes
RAM .................................................................................. 1 Kbyte
[M37906M6C-XXXFP, M37906M6C-XXXSP]
ROM .............................................................................. 48 Kbytes
RAM ................................................................................ 3 Kbytes
•
•
•
•
•
•
•
•
•
[M37906M8C-XXXFP, M37906M8C-XXXSP]
ROM .............................................................................. 60 Kbytes
RAM ................................................................................ 3 Kbytes
Instruction execution time
The fastest instruction at 20 MHz frequency ........................ 50 ns
Single power supply .................................................... 5 V ± 0.5 V
Interrupts ........... 5 external sources, 18 internal sources, 7 levels
Multi-functional 16-bit timer ................................................. 10 + 3
(Three-phase motor drive waveform or Pulse motor drive waveform output is available.)
Serial I/O (UART or Clock synchronous) ..................................... 2
10-bit A-D converter ............................................ 5-channel inputs
8-bit D-A converter ............................................ 2-channel outputs
12-bit watchdog timer
Programmable input/output (ports P1, P2, P5, P6, P7) ............. 30
Note: The M37906M4C-XXXFP/SP and the M37906M4H-XXXFP/
SP have the same functions, distinctive features, and electrical characteristics.
APPLICATION
• Control devices for office equipment such as copiers and facsimiles
• Control devices for industrial equipment such as communication
and measuring instruments
• Control devices for equipment, requiring motor control, such as
inverter air conditioners and general-purpose inverters
M37906MxX-XXXFP PIN CONFIGURATION (TOP VIEW)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
M37906M4C-XXXFP
M37906M4H-XXXFP
M37906M6C-XXXFP
M37906M8C-XXXFP
VREF
AVSS
(Note) P74/AN4/DA1/INT3/RTPTRG0
P73/AN3/DA0
P72/AN2
P71/AN1
P70/AN0
P65/TA2IN/U/RTP11
P64/TA2OUT/V/RTP10
P63/TA1IN/W/RTP03
P62/TA1OUT/U/RTP02
P61/TA0IN/V/RTP01
P60/TA0OUT/W/RTP00
P57/INT7/TB2IN/IDU
P56/INT6/TB1IN/IDV
(Note)
P55/INT5/TB0IN/IDW
P6OUTCUT/INT4
MD0
VCONT
RESET
VCC
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
Outline 42P2R-E
AVCC
P10/CTS0/RTS0
P11/CTS0/CLK0
P12/RxD0
P13/TxD0
P14/CTS1/RTS1
P15/CTS1/CLK1
P16/RxD1
P17/TxD1
P20/TA4OUT
P21/TA4IN
P22/TA9OUT
P23/TA9IN
P24(/TB0IN)
P25(/TB1IN)
P26(/TB2IN)
P27(/INT3/RTPTRG0)
MD1
XOUT
XIN
VSS
(Note)
Note: Allocation of these pins can
be switched by software.
MI
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NAR
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: Th metric
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Not e para
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PR
MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
M37906MxX-XXXSP PIN CONFIGURATION (TOP VIEW)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
M37906M4C-XXXSP
M37906M4H-XXXSP
M37906M6C-XXXSP
M37906M8C-XXXSP
VREF
AVSS
(Note) P74/AN4/DA1/INT3/RTPTRG0
P73/AN3/DA0
P72/AN2
P71/AN1
P70/AN0
P65/TA2IN/U/RTP11
P64/TA2OUT/V/RTP10
P63/TA1IN/W/RTP03
P62/TA1OUT/U/RTP02
P61/TA0IN/V/RTP01
P60/TA0OUT/W/RTP00
P57/INT7/TB2IN/IDU
(Note)
P56/INT6/TB1IN/IDV
P55/INT5/TB0IN/IDW
P6OUTCUT/INT4
MD0
VCONT
RESET
VCC
Outline 42P4B
2
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
AVCC
P10/CTS0/RTS0
P11/CTS0/CLK0
P12/RxD0
P13/TxD0
P14/CTS1/RTS1
P15/CTS1/CLK1
P16/RxD1
P17/TxD1
P20/TA4OUT
P21/TA4IN
P22/TA9OUT
P23/TA9IN
P24(/TB0IN)
P25(/TB1IN)
P26(/TB2IN)
P27(/INT3/RTPTRG0)
MD1
XOUT
XIN
VSS
(Note)
Note: Allocation of these pins can
be switched by software.
MI
ELI
Y
NAR
.
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ecif ct to c
p
s
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a fin are su
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is is ric limit
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T
met
ice:
Not e para
Som
PR
MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
Data Bus (Even)
Data Bus (Odd)
Data Buffer DQ0 (8)
Data Buffer DQ1 (8)
Data Buffer DQ2 (8)
Address Bus
Data Buffer DQ3 (8)
P6OUTCUT
Instruction Queue Buffer Q0 (8)
Instruction Queue Buffer Q1 (8)
VREF
D-A1 Converter (8)
Instruction Queue Buffer Q5 (8)
A-D Converter (10)
Instruction Queue Buffer Q7 (8)
UART1 (9)
Timer TB0 (16)
Timer TA5 (16)
Timer TA0 (16)
Timer TB2 (16)
Timer TB1 (16)
Program Counter PC (16)
Timer TA6 (16)
Timer TA7 (16)
Timer TA2 (16)
MD0
Incrementer/Decrementer (24)
Timer TA1 (16)
Watchdog Timer
Timer TA9 (16)
Timer TA8 (16)
Timer TA4 (16)
Data Address Register DA (24)
Timer TA3 (16)
MD1
Program Address Register PA (24)
Bus
Interface
Unit
(BIU)
Incrementer (24)
Input/Output
port P1
Instruction Queue Buffer Q9 (8)
P1(8)
Instruction Queue Buffer Q8 (8)
(0V)
AVSS
AVcc
Instruction Register (8)
Instruction Queue Buffer Q6 (8)
D-A0 Converter (8)
Instruction Queue Buffer Q4 (8)
UART0 (9)
Reference
Voltage Input
Instruction Queue Buffer Q2 (8)
Instruction Queue Buffer Q3 (8)
Vcc
Direct Page Register DPR0 (16)
Accumulator A (16)
Arithmetic Logic
Unit (16)
P6(6)
P7(5)
3 Kbytes
3 Kbytes
48 Kbytes
60 Kbytes
RAM
1 Kbyte
ROM
Input/Output
port P2
Input/Output
port P7
Note:
Accumulator B (16)
RAM
(Note)
Clock Generating Circuit
XOUT
Clock output
Clock input
XIN
VCONT
BLOCK DIAGRAM
Index Register Y (16)
Index Register X (16)
Central Processing Unit (CPU)
Stack Pointer S (16)
ROM
(Note)
RESET
Reset input
Direct Page Register DPR3 (16)
Input/Output
port P6
Direct Page Register DPR1 (16)
Direct Page Register DPR2 (16)
32 Kbytes
M37906M4C-XXXFP, M37906M4C-XXXSP
M37906M4H-XXXFP, M37906M4H-XXXSP
M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
Processor Status Register PS (11)
Input/Output
port P5
Input Buffer Register IB (16)
P5(3)
(0V)
Vss
Data bank Register DT (8)
P2(8)
Program Bank Register PG (8)
3
MI
ELI
Y
NAR
MITSUBISHI MICROCOMPUTERS
ge.
ion.
icat to chan
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l sp ubject
a
in
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not mits ar
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is is
: Th metric
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Not e para
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M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
FUNCTIONS
Parameter
Number of basic machine instructions
203
Instruction execution time
50 ns (the fastest instruction at f(fsys) = 20 MHz)
External clock input frequency f(XIN)
20 MHz (Max.)
System clock input frequency f(fsys)
20 MHz (Max.)
Memory size
ROM
(Note 1)
RAM
(Note 1)
Programmable input/output
P1, P2
8-bit ✕ 2
ports
P5
3-bit ✕ 1
P6
6-bit ✕ 1
P7
5-bit ✕ 1
TA0–TA9
16-bit ✕ 10
TB0–TB2
16-bit ✕ 3
UART0 and UART1
(UART or Clock synchronous serial I/O) ✕ 2
Multi-functional timers
Serial I/O
Functions
A-D converter
10-bit successive approximation method ✕ 1 (5 channels)
D-A converter
8-bit ✕ 2
Dead-time timer
8-bit ✕ 3
12-bit ✕ 1
Watchdog timer
Interrupts
Maskable interrups
5 external sources, 18 internal sources. Each interrupt can be set
to a priority level within the range of 0–7 by software.
Non-maskable interrups
3 internal sources
Clock generating circuit
Built-in (externally connected to a ceramic resonator or quartzcrystal oscillator).
PLL frequency multiplier
The following multiplication ratios are available: ✕ 2, ✕ 3, ✕ 4
Power supply voltage
5 V±0.5 V
Power dissipation
125 mW (at f(fsys) = 20 MHz, Typ., the PLL frequency multiplier
is inactive)
Ports’ input/output
Input/Output withstand voltage
5V
characteristics
Memory expansion
Output current
5 mA
Operating ambient temperature range
Not available (single-chip mode only).
–20 to 85 °C
Device structure
CMOS high-performance silicon gate process
Package
(Note 2)
Notes 1:
ROM
M37906M4C-XXXFP, M37906M4C-XXXSP
M37906M4H-XXXFP, M37906M4H-XXXSP
RAM
M37906M6C-XXXFP, M37906M6C-XXXSP
48 Kbytes
M37906M8C-XXXFP, M37906M8C-XXXSP
60 Kbytes
M37906M4C-XXXFP, M37906M4C-XXXSP
M37906M4H-XXXFP, M37906M4H-XXXSP
2:
Packages
1 Kbyte
M37906M6C-XXXFP, M37906M6C-XXXSP
3 Kbytes
M37906M8C-XXXFP, M37906M8C-XXXSP
3 Kbytes
M37906M4C-XXXFP, M37906M4H-XXXFP,
M37906M6C-XXXFP, M37906M8C-XXXFP
M37906M4C-XXXSP, M37906M4H-XXXSP,
M37906M6C-XXXSP, M37906M8C-XXXSP
4
32 Kbytes
42-pin plastic molded SSOP (42P2R-E)
42-pin shrink plastic molded DIP (42P4B)
MI
ELI
Y
NAR
.
ion. hange
icat
ecif ct to c
p
s
al
bje
a fin are su
not
s
is is ric limit
h
T
met
ice:
Not e para
Som
PR
MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
PIN DESCRIPTION
Pin
Name
Input/
Output
Functions
Vcc, Vss
Power supply input
MD0
MD0
Input
Connect this pin to VSS.
MD1
MD1
Input
Connect this pin to Vss.
RESET
Reset input
Input
The microcomputer is reset when “L” level is applies to this pin.
XIN
Clock input
Input
XOUT
Clock output
These are input and output pins of the internal clock generating circuit. Connect a
ceramic resonator or quartz-crystal oscillator between pins XIN and XOUT. When an
external clock is used, the clock source should be connected to pin XIN, and pin
XOUT should be left open.
VCONT
Filter circuit connection
—
When using the PLL frequency multiplier, connect this pin to the filter circuit. When
not using, this pin should be left open.
AVcc,
AVss
Analog power supply input
—
Power supply input pins for the A-D and D-A converters. Connect AVcc to Vcc, and
AVss to Vss externally.
VREF
Reference voltage input
P10–P17
I/O port P1
I/O
Port P1 is an 8-bit I/O port. This port has an I/O direction register, and each pin can
be programmed for input or output. These pins enter the input mode ar reset. These
pins also function as I/O pins of UART0, 1.
P20–P27
I/O port P2
I/O
In addition to having the same functions as port P1, these pins function as I/O pins
for timers A4 and A9. Also, they can be programmed to function as input pins for timers B0 to B2 and INT3, or as trigger input pins in the pulse output port mode.
P55–P57
I/O port P5
I/O
In addition to having the same functions as port P1, these pins function as input pins
for INT5 to INT7. Also, they function as input pins for timers B0 to B2 and position
data input pins in the three-phase waveform mode.
P60–P65
I/O port P6
I/O
In addition to having the same functions as port P1, these pins function as I/O pins
for timers A0 to A2. Also, they function as motor drive waveform output pins.
P70–P74
I/O port P7
I/O
In addition to having the same functions as port P1, these pins function as input pins
for the A-D converter. Also, P73 functions as an output pin for the D-A converter, P74
as an output pin for the D-A converter and an input pin for INT3, and a trigger input
pin in the pulse output port mode.
P6OUTCUT
P6OUTCUT input
Input
This pin has the function to forcibly place port P6 pins in the input mode (port-output-cutoff function). Also, this pin functions as an input pin for INT4, and as an input
pin for the port-output-cutoff function in the motor drive waveform output mode.
—
Output
Input
Apply 5 V±0.5 V to Vcc, and 0 V to Vss.
This is the reference voltage input pin for the A-D and D-A converters.
5
MI
ELI
Y
NAR
ge.
ion.
icat to chan
ecif
l sp ubject
a
in
af
es
not mits ar
li
is is
: Th metric
e
ic
Not e para
Som
PR
MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
BASIC FUNCTION BLOCKS
These microcomputers contain the following devices in the single
chip: ROM, RAM, CPU, bus interface unit, and peripheral devices
such as the interrupt control circuit, timers, serial I/O,
A-D converter, D-A converter, I/O ports, clock generating circuit, etc.
MEMORY
Figures 1 (1) through (3) show the memory maps. The address
space is 64 Kbytes from addresses 016 through FFFF16. This ad-
00000016
00000016
0000FF16
00010016
000BFF16
000C0016
dress space is called “bank 016”.
The internal ROM and RAM are allocated as shown in Figures 1 (1)
through (3).
Addresses FFB416 through FFFF16 contain the RESET and the interrupt vector addresses, and the interrupt vectors are stored there.
For details, refer to the section on interrupts.
Allocated to addresses 016 through FF16 are peripheral devices such
as I/O ports, A-D converter, D-A converter, serial I/O, timers, interrupt
control registers, etc. Figures 2 and 3 show the location of SFRs.
Peripheral devices’
control registers
Internal RAM
1024 bytes
000FFF16
00100016
007FFF16
00800016
Peripheral devices’
control registers
(See Figures 2 and 3.)
Unused area
Bank 016
00FFFF16
00000016
Unused area
0000FF16
00FFB416
Interrupt vector table
Reserved area
Reserved area
Timer A9
Timer A8
Timer A7
Timer A6
Timer A5
Internal ROM
32 Kbytes
INT7
INT6
INT5
Reserved area
Address matching detect
Reserved area
Reserved area
00FFB416
INT4
INT3
A-D conversion
UART1 transmit
UART1 receive
UART0 transmit
UART0 receive
Timer B2
Timer B1
Timer B0
Timer A4
Timer A3
Timer A2
Timer A1
Timer A0
00FFFF16
Reserved area
Reserved area
Reserved area
Reserved area
Watchdog timer
00FFFE16
Fig. 1 (1) Memory map of M37906M4C-XXXFP/SP and M37906M4H-XXXFP/SP (Single-chip mode)
6
DBC
BRK instruction
Zero divide
RESET
MI
ELI
Y
NAR
.
ion. hange
icat
ecif ct to c
p
s
al
bje
a fin are su
not
s
is is ric limit
h
T
met
ice:
Not e para
Som
PR
00000016
MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
00000016
0000FF16
00010016
0003FF16
00040016
Peripheral devices’
control registers
Internal RAM
3072 bytes
000FFF16
00100016
003FFF16
00400016
Peripheral devices’
control registers
(See Figures 2 and 3.)
Unused area
Bank 016
00FFFF16
00000016
Unused area
0000FF16
00FFB416
Internal ROM
48 Kbytes
Interrupt vector table
Reserved area
Reserved area
Timer A9
Timer A8
Timer A7
Timer A6
Timer A5
INT7
INT6
INT5
Reserved area
Address matching detect
Reserved area
Reserved area
00FFB416
INT4
INT3
A-D conversion
UART1 transmit
UART1 receive
UART0 transmit
UART0 receive
Timer B2
Timer B1
Timer B0
Timer A4
Timer A3
Timer A2
Timer A1
Timer A0
00FFFF16
Reserved area
Reserved area
Reserved area
Reserved area
Watchdog timer
00FFFE16
DBC
BRK instruction
Zero divide
RESET
Fig. 1 (2) Memory map of M37906M6C-XXXFP/SP (Single-chip mode)
7
MI
ELI
Y
NAR
ge.
ion.
icat to chan
ecif
l sp ubject
a
in
af
es
not mits ar
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is is
: Th metric
e
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Not e para
Som
PR
00000016
MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
00000016
0000FF16
00010016
0003FF16
00040016
Peripheral devices’
control registers
Peripheral devices’
control registers
(See Figures 2 and 3.)
Unused area
Bank 016
Internal RAM
3072 bytes
00FFFF16
00000016
000FFF16
00100016
0000FF16
00FFB416
Internal ROM
60 Kbytes
Interrupt vector table
Reserved area
Reserved area
Timer A9
Timer A8
Timer A7
Timer A6
Timer A5
INT7
INT6
INT5
Reserved area
Address matching detect
Reserved area
Reserved area
00FFB416
INT4
INT3
A-D conversion
UART1 transmit
UART1 receive
UART0 transmit
UART0 receive
Timer B2
Timer B1
Timer B0
Timer A4
Timer A3
Timer A2
Timer A1
Timer A0
00FFFF16
Reserved area
Reserved area
Reserved area
Reserved area
Watchdog timer
00FFFE16
Fig. 1 (3) Memory map of M37906M8C-XXXFP/SP (Single-chip mode)
8
DBC
BRK instruction
Zero divide
RESET
MI
ELI
Y
NAR
.
ion. hange
icat
ecif ct to c
p
s
al
bje
a fin are su
not
s
is is ric limit
h
T
met
ice:
Not e para
Som
PR
MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
Address (Hexadecimal notation)
Address (Hexadecimal notation)
00000016 Reserved area (Note)
00000116 Reserved area (Note)
00000216 Reserved area (Note)
00000316 Port P1 register
00000416 Reserved area (Note)
00000516 Port P1 direction register
00000616 Port P2 register
00000716 Reserved area (Note)
00000816 Port P2 direction register
00000916 Reserved area (Note)
00000A16 Reserved area (Note)
00000B16 Port P5 register
00000C16 Reserved area (Note)
00000D16 Port P5 direction register
00000E16 Port P6 register
00000F16 Port P7 register
00001016 Port P6 direction register
00001116 Port P7 direction register
00001216 Reserved area (Note)
00001316
00001416 Reserved area (Note)
00001516
00001616 Reserved area (Note)
00001716 Reserved area (Note)
00001816 Reserved area (Note)
00001916 Reserved area (Note)
00001A16
00001B16
00001C16
00001D16
00001E16 A-D control register 0
00001F16 A-D control register 1
00002016
A-D register 0
00002116
00002216
A-D register 1
00002316
00002416
A-D register 2
00002516
00002616
A-D register 3
00002716
00002816
A-D register 4
00002916
00002A16 Reserved area (Note)
00002B16 Reserved area (Note)
00002C16 Reserved area (Note)
00002D16 Reserved area (Note)
00002E16 Reserved area (Note)
00002F16 Reserved area (Note)
00003016 UART0 transmit/receive mode register
00003116 UART0 baud rate register (BRG0)
00003216
UART0 transmit buffer register
00003316
00003416 UART0 transmit/receive control register 0
00003516 UART0 transmit/receive control register 1
00003616
UART0 receive buffer register
00003716
00003816 UART1 transmit/receive mode register
00003916 UART1 baud rate register (BRG1)
00003A16
UART1 transmit buffer register
00003B16
00003C16 UART1 transmit/receive control register 0
00003D16 UART1 transmit/receive control register 1
00003E16
UART1 receive buffer register
00003F16
00004016 Count start register 0
00004116 Count start register 1
00004216 One-shot start register 0
00004316 One-shot start register 1
00004416 Up-down register 0
00004516 Timer A clock division select register
00004616
Timer A0 register
00004716
00004816
Timer A1 register
00004916
00004A16
Timer A2 register
00004B16
00004C16
Timer A3 register
00004D16
00004E16
Timer A4 register
00004F16
00005016
Timer B0 register
00005116
00005216
Timer B1 register
00005316
00005416
Timer B2 register
00005516
00005616 Timer A0 mode register
00005716 Timer A1 mode register
00005816 Timer A2 mode register
00005916 Timer A3 mode register
00005A16 Timer A4 mode register
00005B16 Timer B0 mode register
00005C16 Timer B1 mode register
00005D16 Timer B2 mode register
00005E16 Processor mode register 0
00005F16 Processor mode register 1
00006016 Watchdog timer register
00006116 Watchdog timer frequency select register
00006216 Particular function select register 0
00006316 Particular function select register 1
00006416 Particular function select register 2
00006516 Reserved area (Note)
00006616 Debug control register 0
00006716 Debug control register 1
00006816
00006916 Address comparison register 0
00006A16
00006B16
00006C16 Address comparison register 1
00006D16
00006E16 INT3 interrupt control register
00006F16 INT4 interrupt control register
00007016 A-D conversion interrupt control register
00007116 UART0 transmit interrupt control register
00007216 UART0 receive interrupt control register
00007316 UART1 transmit interrupt control register
00007416 UART1 receive interrupt control register
00007516 Timer A0 interrupt control register
00007616 Timer A1 interrupt control register
00007716 Timer A2 interrupt control register
00007816 Timer A3 interrupt control register
00007916 Timer A4 interrupt control register
00007A16 Timer B0 interrupt control register
00007B16 Timer B1 interrupt control register
00007C16 Timer B2 interrupt control register
00007D16 Reserved area (Note)
00007E16 Reserved area (Note)
00007F16 Reserved area (Note)
Note: Do not write to this address.
Fig. 2 Location of SFRs (1)
9
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MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
Address (Hexadecimal notation)
00008016
00008116
00008216
00008316
00008416
00008516
00008616
00008716
00008816
00008916
00008A16
00008B16
00008C16
00008D16
00008E16
00008F16
00009016
00009116
00009216
00009316
00009416
00009516
00009616
00009716
00009816
00009916
00009A16
00009B16
00009C16
00009D16
00009E16
00009F16
0000A016
0000A116
0000A216
0000A316
0000A416
0000A516
0000A616
0000A716
0000A816
0000A916
0000AA16
0000AB16
0000AC16
0000AD16
0000AE16
0000AF16
0000B016
0000B116
0000B216
0000B316
0000B416
0000B516
0000B616
0000B716
0000B816
0000B916
0000BA16
0000BB16
0000BC16
0000BD16
0000BE16
0000BF16
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
External interrupt input read-out register
D-A control register
D-A register 0
D-A register 1
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Waveform output mode register
Dead-time timer
Three-phase output data register 0
Three-phase output data register 1
Position-data-retain function control register
Serial I/O pin control register
Port P2 pin function control register
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Clock control register 0
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Note: Do not write to this address.
Fig. 3 Location of SFRs (2)
10
16-BIT CMOS MICROCOMPUTER
Address (Hexadecimal notation)
0000C016
0000C116
0000C216
0000C316
0000C416
0000C516
0000C616
0000C716
0000C816
0000C916
0000CA16
0000CB16
0000CC16
0000CD16
0000CE16
0000CF16
0000D016
0000D116
0000D216
0000D316
0000D416
0000D516
0000D616
0000D716
0000D816
0000D916
0000DA16
0000DB16
0000DC16
0000DD16
0000DE16
0000DF16
0000E016
0000E116
0000E216
0000E316
0000E416
0000E516
0000E616
0000E716
0000E816
0000E916
0000EA16
0000EB16
0000EC16
0000ED16
0000EE16
0000EF16
0000F016
0000F116
0000F216
0000F316
0000F416
0000F516
0000F616
0000F716
0000F816
0000F916
0000FA16
0000FB16
0000FC16
0000FD16
0000FE16
0000FF16
Up-down register 1
Timer A5 register
Timer A6 register
Timer A7 register
Timer A8 register
Timer A9 register
Timer A01 register
Timer A11 register
Timer A21 register
Timer A5 mode register
Timer A6 mode register
Timer A7 mode register
Timer A8 mode register
Timer A9 mode register
Reserved area (Note)
Comparator function select register 0
Reserved area (Note)
Comparator result register 0
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Reserved area (Note)
Timer A5 interrupt control register
Timer A6 interrupt control register
Timer A7 interrupt control register
Timer A8 interrupt control register
Timer A9 interrupt control register
INT5 interrupt control register
INT6 interrupt control register
INT7 interrupt control register
MI
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MITSUBISHI MICROCOMPUTERS
Y
NAR
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Not e para
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PR
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
CENTRAL PROCESSING UNIT (CPU)
INDEX REGISTER X (X)
The CPU has 13 registers and is shown in Figure 4. Each of these
registers is described below.
Index register X consists of 16 bits and the low-order 8 bits can be
used separately. Index register length flag x determines whether the
register is used as 16-bit register or as 8-bit register. It is used as a
16-bit register when flag x is “0” and as an 8-bit register when flag x
is “1”. Flag x is a part of the processor status register (PS) which is
described later.
In index addressing modes in which register X is used as the index
register, the contents of this address are added to obtain the real address.
Index register X functions as a pointer register which indicates an
address of data table in instructions MVP, MVN, RMPA (Repeat
MultiPly and Accumulate).
ACCUMULATOR A (A)
Accumulator A is the main register of the microcomputer. It consists
of 16 bits and the low-order 8 bits can be used separately. Data
length flag m determines whether the register is used as 16-bit register or as 8-bit register. It is used as a 16-bit register when flag m is
“0” and as an 8-bit register when flag m is “1”. Flag m is a part of the
processor status register (PS) which is described later.
Data operations such as calculations, data transfer, input/output,
etc., are executed mainly through accumulator A.
INDEX REGISTER Y (Y)
ACCUMULATOR B (B)
Accumulator B has the same functions as accumulator A, but the use
of accumulator B requires more instruction bytes and execution
cycles than accumulator A.
ACCUMULATOR E
Accumulator E is a 32-bit register and consists of accumulator A
(low-order 16 bits) and accumulator B (high-order 16 bits). It is used
for 32-bit data processing.
Accumulator B
15
Accumulator A
7
BH
Index register Y consists of 16 bits and the low-order 8 bits can be
used separately. The index register length flag x determines whether
the register is used as 16-bit register or as 8-bit register. It is used as
a 16-bit register when flag x is “0” and as an 8-bit register when flag
x is “1”. Flag x is a part of the processor status register (PS) which is
described later.
In index addressing modes in which register Y is used as the index
register, the contents of this address are added to obtain the real address.
Index register Y functions as a pointer register which indicates an
address of data table in instructions MVP, MVN, RMPA (Repeat
MultiPly and Accumulate).
0 15
BL
7
0
AL
AH
31
0
Accumulator E
15
7
AH
15
0
AL
7
BH
15
0
BL
0
7
XH
15
Index register X
XL
7
0
Index register Y
YL
YH
15
7
0
PG
7
Stack pointer S
S
Program bank register PG
15
0
Program counter PC
PC
0
DT
0
Data bank register DT
15
15
0 0 0 0 0
0
DPR0 to DPR3
7
IPL2 IPL1 IPL0 N V m x D
I
Direct page registers DPR0 to DPR3
0
Z C Processor status register PS
Carry flag
Zero flag
Interrupt disable flag
Decimal mode flag
Index register length flag
Data length flag
Overflow flag
Negative flag
Processor interrupt priority level IPL
Fig. 4 Register structure
11
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REL
MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
STACK POINTER (S)
PROCESSOR STATUS REGISTER (PS)
Stack pointer (S) is a 16-bit register. It is used during a subroutine
call or interrupts. It is also used during stack, stack pointer relative,
or stack pointer relative indirect indexed Y addressing mode.
Processor status register (PS) is an 11-bit register. It consists of
flags to indicate the result of operation and CPU interrupt levels.
Branch operations can be performed by testing the flags C, Z, V, and
N.
The details of each bit of the processor status register are described
below.
PROGRAM COUNTER (PC)
Program counter (PC) is a 16-bit counter that indicates the low-order
16 bits of the next program memory address to be executed. There
is a bus interface unit between the program memory and the CPU,
so that the program memory is accessed through bus interface unit.
This is described later.
PROGRAM BANK REGISTER (PG)
Program bank register is an 8-bit register that indicates the high-order 8 bits of the next program memory address to be executed.
When a carry occurs by incrementing the contents of the program
counter, the contents of the program bank register (PG) is increased
by 1. Also, when a carry or borrow occurs after adding or subtracting
the offset value to or from the contents of the program counter (PC)
using the branch instruction, the contents of the program bank register (PG) is increased or decreased by 1, so that programs can be
written without worrying about bank boundaries.
DATA BANK REGISTER (DT)
Data bank register (DT) is an 8-bit register. With some addressing
modes, the data bank register (DT) is used to specify a part of the
memory address. The contents of data bank register (DT) is used as
the high-order 8 bits of a 24-bit address. Addressing modes that use
the data bank register (DT) are direct indirect, direct indexed X indirect, direct indirect indexed Y, absolute, absolute bit, absolute indexed X, absolute indexed Y, absolute bit relative, and stack pointer
relative indirect indexed Y.
DIRECT PAGE REGISTERS 0 through 3
(DPR0 through DPR3)
The direct page register is a 16-bit register. An addressing mode of
which name includes ‘direct’ generates an address of data to be accessed, regarding the contents of this register as the base address.
The 7900 Series has been expanded direct page registers up to 4
(DPR0 to DPR3), in comparison to the 7700 Series which has the
single direct page register. Accordingly, the 7900 Series’s direct addressing method which uses direct page registers differs from that of
the 7700 Series. However, the conventional direct addressing
method, using only DPR0, is still be selectable, in order to make use
of the 7700 Series software property. For more details, refer to the
section on the direct page.
12
1. Carry flag (C)
The carry flag contains the carry or borrow generated by the ALU after an arithmetic operation. This flag is also affected by shift and rotate instructions. This flag can be set and reset directly with the SEC
and CLC instructions or with the SEP and CLP instructions.
2. Zero flag (Z)
The zero flag is set if the result of an arithmetic operation or data
transfer is zero and reset if it is not. This flag can be set and reset
directly with the SEP and CLP instructions.
3. Interrupt disable flag (I)
When the interrupt disable flag is set to “1”, all interrupts except
watchdog timer and software interrupts are disabled. This flag is set
to “1” automatically when an interrupt is accepted. It can be set and
reset directly with the SEI and CLI instructions or SEP and CLP instructions.
4. Decimal mode flag (D)
The decimal mode flag determines whether addition and subtraction
are performed as binary or decimal. Binary arithmetic is performed
when this flag is “0”. If it is “1”, decimal arithmetic is performed with
each word treated as 2- or 4- digit decimal. Arithmetic operation is
performed using four digits when data length flag m is “0” and with
two digits when it is “1”. Decimal adjust is automatically performed.
(Decimal operation is possible only with the ADC and SBC instructions.) This flag can be set and reset with the SEP and CLP instructions.
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MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
5. Index register length flag (x)
The index register length flag determines whether index register X
and index register Y are used as 16-bit registers or as 8-bit registers.
The registers are used as 16-bit registers when flag x is “0” and as 8bit registers when it is “1”.
This flag can be set and reset with the SEP and CLP instructions.
6. Data length flag (m)
The data length flag determines whether the data length is 16-bit or
8-bit. The data length is 16 bits when flag m is “0” and 8 bits when it
is “1”. This flag can be set and reset with the SEM and CLM instructions or with the SEP and CLP instructions.
7. Overflow flag (V)
The overflow flag is valid when addition or subtraction is performed
with a word treated as a signed binary number. If data length flag m
is “0”, the overflow flag is set when the result of addition or subtraction is outside the range between –32768 and +32767. If data length
flag m is “1”, the overflow flag is set when the result of addition or
subtraction is outside the range between –128 and +127. It is reset
in all other cases. The overflow flag can also be set and reset directly
with the SEP, and CLV or CLP instructions.
Additionally, the overflow flag is set when a result of unsigned/signed
division exceeds the length of the register where the result is to be
stored; the flag is also set when the addition result is outside range
of –2147483648 to +2147483647 in the RMPA operation.
8. Negative flag (N)
The negative flag is set when the result of arithmetic operation or
data transfer is negative (If data length flag m is “0”, data’s bit 15 is
“1”. If data length flag m is “1”, data’s bit 7 is “1”.) It is reset in all other
cases. It can also be set and reset with the SEP and CLP instructions.
9. Processor interrupt priority level (IPL)
The processor interrupt priority level (IPL) consists of 3 bits and determines the priority of processor interrupts from level 0 to level 7.
Interrupt is enabled when the interrupt priority of the device requesting interrupt (set using the interrupt control register) is higher than
the processor interrupt priority. When an interrupt is enabled, the current processor interrupt priority level is saved in a stack and the processor interrupt priority level is replaced by the interrupt priority level
of the device requesting the interrupt. Refer to the section on interrupts for more details.
Note: Fix bits 11 to 15 of the processor status register (PS) to “0”.
13
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REL
MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
BANK
In order to effectively use the integrated hardware on the chip, this
CPU core uses an address generating method with a 24-bit address
split into high-order 8 bits and low-order 16 bits. In other words, the
64 Kbytes specified by the low-order 16 bits are one unit (referred to
as “bank”), and the address space is divided into 256 banks (016 to
FF16) specified by the high-order 8 bits.
In the program area on the address space, the bank is specified by
the program bank register (PG), and the address in the bank is
specified by the program counter (PC).
As for each bank boundary, when an overflow has occurred in PC,
the contents of PG are incremented by 1. When a borrow has occurred in PC, the contents of PG are decremented by 1. Under the
normal conditions, therefore, programming without concern for the
bank boundaries is possible. Furthermore, as for the data area on
the address space, the bank is specified by the data bank register
(DT), and the address in the bank is specified by the operation result
by using the various addressing modes (Note).
Note: Some addressing modes directly specify a bank.
DIRECT PAGE
The internal memory and control registers for internal peripheral devices, etc. are assigned to bank 016 (addresses 016 to FFFF16). The
direct page and direct addressing modes have been provided for the
effective access to bank 016. In the 7900 Series, two types of direct
addressing modes are available: the conventional direct addressing
mode which uses only DPR0, as in the 7700 Series, and the expanded direct addressing mode, which uses up to 4 direct page registers as selected by the user. The addressing mode is selected
according to the contents of bit 1 of the processor mode register 1.
This bit 1 is cleared to “0” at reset. (In other words, the conventional
direct addressing mode is selected.) However, once this bit 1 has
been set to “1” by software, this bit cannot be cleared to “0” again,
except by reset. That is to say, when one of these two direct addressing modes has been selected just after reset, the selected addressing mode cannot be switched to another one while the program is
running.
■ Conventional direct addressing mode
The direct page area consists of 256-byte space. Its bank address is
“0016”, and the base address of its low-order 16-bit address is specified by the contents of the direct page register 0 (DPR0). In this conventional direct addressing modes, a value (1 byte) just after an
instruction code is regarded as an offset value for the DPR0 contents, and the CPU accesses each address in the direct page area.
■ Expanded direct addressing mode
The direct page area consists of four 64-byte spaces. Their bank
address is “0016”, and the four base addresses of their low-order 16bit addresses are respectively specified by the contents of four direct
page registers. In this expanded direct addressing mode, a value (1
byte) just after an instruction code is regarded as follows:
• High-order 2 bits: regarded as a selection field for DPR0 to DPR3.
• Low-order 6 bits: regarded as an offset value for the selected direct
page register.
Then, the CPU accesses each address in each direct page area:
14
16-BIT CMOS MICROCOMPUTER
Refer to “7900 Series Software Manual” for details concerning the
various addressing modes which use the direct page area.
Instruction Set
The CPU core of the 7900 Series has an expanded instruction set
based on the existing 7700/7751 Series’ CPU core. In addition, its
source code (mnemonic) has the complete upper compatibility with
the 7700 Series instruction set.
For details concerning addressing modes and instruction set, refer to
“7900 Series Software Manual”.
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MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
BUS INTERFACE UNIT
Data transfer between the central processing unit (CPU) and internal memory, internal peripheral devices is always performed via the
bus interface unit (BIU), which is located between the CPU and the
internal buses.
Figure 5 shows the BIU and the bus structure. The CPU and BIU are
connected by a dedicated bus, and any transfer between the CPU
and BIU is controlled by this dedicated bus.
On the other hand, data transfer between the BIU and internal pe-
ripheral devices uses the following internal common buses: 32-bit
code bus, 16-bit data bus, 24-bit address bus, and control signals.
The bus control method where the code bus and the data bus separate out (hereafter, this method is referred to as the separate code/
data bus method) is employed in order to improve data transfer capabilities. As a result, the internal memory is connected to both the
code bus and the data bus, and registers of all other internal peripheral devices are connected only to the data bus.
M37906
Internal buses
CPU bus
Central
Processing
Unit
(CPU)
Internal code bus (CB0 to CB31)
Bus
Interface
Unit
(BIU)
Internal data bus (DB0 to DB15)
Internal address bus (AD0 to AD23)
Internal
memory
Internal control signal
Internal
peripheral
devices
(SFR)
SFR : Special Function Register
❈ The CPU bus and internal bus separate out independently.
Fig. 5 BIU and bus structure
15
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MITSUBISHI MICROCOMPUTERS
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REL
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
BIU structure
The BIU consists of four registers shown in Figure 6. Table 1 lists the
functions of each register.
Table 1. Functions of each register
Name
Functions
Program address register
Indicates a storage address for an instruction to be next taken into an instruction queue buffer.
Instruction queue buffer
Temporarily stores an instruction which has been taken from a memory. Consists of 10 bytes.
Data address register
Indicates an address where data will be next read from or written to.
Data buffer
Temporarily stores data which has been read from internal memory or internal peripheral devices by the
BIU; or temporarily stores data which is to be written to internal memory or internal peripheral devices
by the CPU. Consists of 32 bits.
b23
b0
PA
Program address register
b7
b0
Q0
Instruction queue buffer
Q9
b23
b0
Data address register
DA
b31
b0
DQ
Fig. 6 Register structure of BIU
16
Data buffer
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MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
BIU Functions
(1) Instruction prefetch
The BIU has ten instruction queue buffers; each buffer consists of 1
byte. When there is an opening in the bus and the instruction queue
buffer, an instruction code is read from the program memory (in other
words, the memory where a program is stored) and prefetched into
an instruction queue buffer. The prefetched instruction code is transferred from the BIU to the CPU, in response to a request from the
CPU, via a dedicated bus.
When a branch occurs as a result of a branch instruction (JMP, BRA,
etc.), subroutine call, or interrupt, the contents of the instruction
queue buffer are initialized and the BIU reads a new instruction from
the branch destination address.
Note that the operations of the BIU instruction prefetch also differ depending on the store addresses for instructions. The store addresses
for instructions to be prefetched are categorized as listed in Table 2.
(2) Data read operation
When executing an instruction for reading data from the internal
memory or internal peripheral devices, at first, the CPU informs the
BIU’s data address register of the address where the data has been
located.
Next, the BIU reads the above data from the specified address,
passes it to the data buffer, and then, transfers it to the CPU.
16-BIT CMOS MICROCOMPUTER
Table 2. Store addresses for instructions to be prefetched
Low-order 3 bits of store address for instruction
AD0 (A0)
AD1 (A1)
AD2 (A2)
X
0
X
Even address
4-byte boundary
0
0
X
8-byte boundary
0
0
0
X: 0 or 1
Figures 7 and 8 show the bus cycle waveform examples for instruction prefetch and data access.
Access to internal area
When branched or at instruction
prefetch
φBIU
Internal address bus Address
Internal code bus
CB0 to CB31
Code
(3) Data write operation
When executing an instruction for writing data into the internal
memory or internal peripheral devices, at first, the CPU informs the
BIU’s data address register of the address where the data has been
located.
Next, the BIU passes the above data to the data buffer register, and
then, writes it into the specified address.
Fig. 7 Bus cycle waveform example for instruction prefetch
(4) Bus cycle
In order for the BIU to execute the above operations (1) through (3),
the 24-bit address bus, 32-bit code bus, 16-bit data bus and internal
control signals must be appropriately controlled during data transfer
between the BIU and internal memory or internal peripheral devices.
This operation is called “bus cycle”. The bus cycle is affected by the
lengh of data to be transferred (byte, word, or double-word) at data
access.
17
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M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
Access starting from even address
Access starting from odd address
φBIU
8-bit
data
read
Internal address bus
φBIU
Address
Internal data bus
Internal address bus
D0 to D7
DB0 to DB7
φBIU
8-bit
data
written
Internal address bus
Internal address bus
D0 to D7
DB0 to DB7
DB0 to DB7
DB8 to DB15
DB8 to DB15
Access to internal area
Internal address bus
D0 to D7
Internal data bus
DB0 to DB7
DB8 to DB15
D8 to D15
DB0 to DB7
DB8 to DB15
φ1
16-bit
data
written
A0 to A23
D0 to D7
D0 to D7
D8 to D15
D8 to D15
D8 to D15
φBIU
32-bit
data
read
32-bit
data
written
Internal data bus
Internal address
bus
Address + 2
Internal data bus
D8 to D15
DB0 to DB7
DB8 to DB15
φBIU
φBIU
Internal address
bus
Internal data bus
D0 to D7
D0 to D7
Internal address
bus
Internal data bus
D8 to D15
D8 to D15
DB8 to DB15
DB0 to DB7
DB8 to DB15
D0 to D7
D8 to D15
Address
Address + 2
Invalid
D0 to D7
D8 to D15
Invalid
Address
Address + 1
D0 to D7
D8 to D15
Address
Address + 1
Address + 3
Invalid
D0 to D7
D0 to D7
D8 to D15
D8 to D15
Invalid
Address
Address + 1
D0 to D7
DB0 to DB7
Fig. 8 Bus cycle waveform example for data access (access to internal area)
18
Address + 1
φBIU
Address
D0 to D7
DB0 to DB7
DB8 to DB15
Address
φ1
Address
D0 to D7
Internal address
bus
D8 to D15
φBIU
Address
Internal data bus
A0 to A23
Address
Internal data bus
φBIU
16-bit
data
read
D8 to D15
φBIU
Address
Internal data bus
Internal address bus
Invalid
DB0 to DB7
DB8 to DB15
Invalid
DB8 to DB15
Address
Internal data bus
D8 to D15
D8 to D15
Address + 3
D0 to D7
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M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
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16-BIT CMOS MICROCOMPUTER
● Number of bus cycles
Figure 9 shows the bus cycle waveform at access to the internal
area. Bit 7 of the processor mode register 1 (address 5F16), which is
shown in Figure 10, selects the number of bus cycles for the internal
ROM: 3φ or 2φ. (This bit 7 is the internal ROM bus cycle select bit.)
The internal RAM, SFRs (internal peripheral devices’ control registers) are always accessed with 1 bus cycle = 2φ.
1 bus cycle = 3φ (Note)
1 bus cycle = 2φ
(Internal ROM bus cycle select bit = 0)
(Internal ROM bus cycle select bit = 1)
1 bus cycle = 2φ
1 bus cycle = 3φ
φBIU
ROM
φBIU
Internal address bus
Internal address bus
Address
Internal data bus,
Internal code bus
Internal data bus
Internal code bus
Data
Address
Data
1 bus cycle = 2φ
RAM
φBIU
Internal address bus
SFR
Internal data bus,
Internal code bus
Address
Data
Note: When reprogramming the internal flash memory in the CPU reprogramming mode, select the bus cycle = 3φ.
Fig. 9 Bus cycle waveform at access to internal area
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
Processor mode register 1
Address
5F16
Fix these bits to “00000002”.
Internal ROM bus cycle select bit
0 : 1 bus cycle = 3φ
1 : 1 bus cycle = 2φ
Fig. 10 Bit configuration of processor mode register 1
19
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MITSUBISHI MICROCOMPUTERS
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REL
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
PROCESSOR MODES
This microcomputer is dedicated to the single-chip mode. Therefore,
be sure to connect pin MD0 to Vss, and be sure to fix the processor
mode bits (bits 1 and 0 of the processor mode register 0, address
5E16), which is shown in Figure 11, to “002”.
7
0
6
5
4
3
2
1
0
0
0
0
0
Processor mode register 0
Address
5E16
Processor mode bits
0 0 : Single-chip mode
0 1 : Do not select.
1 0 : Do not select.
1 1 : Do not select.
Fix these bits to “002”.
Interrupt priority detection time select bits
0 0 : 7 cycles of fsys
0 1 : 4 cycles of fsys
1 0 : 2 cycles of fsys
1 1 : Do not select.
Software reset bit
By a write of “1” to this bit, the microcomputer will be reset, and then, restarted.
Fix this bit to “0”.
Fig. 11 Bit configuration of processor mode register 0
20
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MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
INTERRUPTS
Table 3 shows the interrupt sources and the corresponding interrupt
vector addresses. Reset is also handled as an interrupt source in
this section, too.
DBC and BRK instruction are interrupts used only for debugging.
Therefore, do not use these interrupts.
Interrupts other than reset, watchdog timer, zero divide, and address
matching detection all have interrupt control registers. Table 4 shows
the addresses of the interrupt control registers and Figure 13 shows
the bit configuration of the interrupt control register.
The interrupt request bit is automatically cleared by the hardware
during reset or when processing an interrupt. Also, interrupt request
bits except for that of a watchdog timer interrupt can be cleared by
software.
An INTi (i = 3 to 7) interrupt request is generated by an external input.
INTi is an external interrupt; whether to cause an interrupt at the input level (level sense) or at the edge (edge sense) can be selected
with the level/edge select bit. Furthermore, the polarity of the interrupt input can be selected with the polarity select bit.
The position where pin INT3/RTPTRG0 is allocated can be selected
by the pin INT3/RTPTRG0 select bit (bit 3 of the port P2 pin function
control register; address AE16), as shown in Figure 17.
When using the following pins as external interrupt input pins, be
sure to clear the direction registers of the corresponding multiplexed
ports to “0”: pins P27/INT3, P55/INT5, P56/INT6, and P57(P74)/INT7.
When the external interrupt input read register (address 9516), which
is shown in Figure 12, is read out, the status of pins INT3 through
INT7 can directly be read.
Timer and UART interrupts are described in the respective section.
The priority of interrupts when multiple interrupt requests are caused
simultaneously is partially fixed by hardware, but, it can also be adjusted by software as shown in Figure 14.
The hardware priority is fixed as the following:
reset > watchdog timer > other interrupts
16-BIT CMOS MICROCOMPUTER
Table 3. Interrupt sources and interrupt vector addresses
Interrupts
Vector addresses
Timer A9
00FFB816
00FFB916
Timer A8
00FFBA16
00FFBB16
Timer A7
00FFBC16
00FFBD16
Timer A6
00FFBE16
00FFBF16
Timer A5
00FFC016
00FFC116
INT7 external interrupt
00FFC216
00FFC316
INT6 external interrupt
INT5 external interrupt
00FFC416
00FFC616
00FFC516
00FFC716
Address matching detection interrupt
00FFCA16
00FFCB16
INT4 external interrupt
00FFD016
00FFD116
INT3 external interrupt
00FFD216
00FFD316
A-D conversion
00FFD416
00FFD516
UART1 transmit
00FFD616
00FFD716
UART1 receive
00FFD816
00FFD916
UART0 transmit
00FFDA16
00FFDB16
UART0 receive
00FFDC16
00FFDD16
Timer B2
Timer B1
00FFDE16
00FFE016
00FFDF16
00FFE116
Timer B0
00FFE216
00FFE316
Timer A4
00FFE416
00FFE516
Timer A3
00FFE616
00FFE716
Timer A2
00FFE816
00FFE916
Timer A1
00FFEA16
00FFEB16
Timer A0
00FFEC16
00FFED16
Watchdog timer
00FFF616
00FFF716
DBC (Do not select.)
00FFF816
00FFF916
Break instruction (Do not select.)
Zero divide
00FFFA16
00FFFC16
00FFFB16
00FFFD16
Reset
00FFFE16
00FFFF16
7
6
5
4
3
2
1
0
External interrupt input read register
Address
9516
Undefined at read.
INT3 read bit
INT4 read bit
INT5 read bit
INT6 read bit
INT7 read bit
Fig. 12 Bit configuration of external interrupt input read register
21
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7
6
5
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
4
16-BIT CMOS MICROCOMPUTER
3
2
1
0
Interrupt priority level select bits (Note 1)
Interrupt request bit
0 : No interrupt requested
1 : Interrupt requested
Interrupt control register bit configuration for A-D converter, UART0, UART1,
timer A0 to timer A9, and timer B0 to timer B2.
7
6
5
4
3
2
1
0
Interrupt priority level select bits (Note 1)
Interrupt request bit (Note 2)
0 : No interrupt requested
1 : Interrupt requested
Polarity select bit
0 : Interrupt request bit is set to “1” at “H” level when level sense is selected;
this bit is set to “1” at falling edge when edge sense is selected.
1 : Interrupt request bit is set to “1” at “L” level when level sense is selected;
this bit is set to “1” at rising edge when edge sense is selected.
Level/Edge select bit
0 : Edge sense
1 : Level sense
Interrupt control register bit configuration for INT3– INT7
Notes 1: Use the MOVM (MOVMB) instruction or the STA (STAB, STAD) instruction for writing to this bit.
2: Interrupt request bits of INT3 to INT7 are invalid when the level sense is selected.
Fig. 13 Bit configuration of interrupt control register
22
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MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
Table 4. Addresses of interrupt control registers
Interrupt control registers
16-BIT CMOS MICROCOMPUTER
Addresses
00006E16
INT4 interrupt control register
A-D interrupt control register
00006F16
00007016
UART0 transmit interrupt control register
00007116
UART0 receive interrupt control register
00007216
UART1 transmit interrupt control register
00007316
UART1 receive interrupt control register
Timer A0 interrupt control register
00007416
Timer A1 interrupt control register
00007616
Timer A2 interrupt control register
00007716
Timer A3 interrupt control register
Timer A4 interrupt control register
00007816
00007916
Timer B0 interrupt control register
00007A16
Priority is determined by hardware
INT3 interrupt control register
For reset, watchdog timer, zero divide, and address match detection
interrupts, which do not have an interrupt control register, the processor interrupt level (IPL) is set as shown in Table 5.
➂
➁
➀
Watchdog
timer
Reset
00007516
A-D converter, UART, etc. interrupts
Priority can be changed by software inside ➂.
Fig. 14 Interrupt priority
Timer B1 interrupt control register
00007B16
Timer B2 interrupt control register
00007C16
Timer A5 interrupt control register
0000F516
Timer A6 interrupt control register
Timer A7 interrupt control register
0000F616
Timer A9
0000F716
Timer A8
Timer A8 interrupt control register
0000F816
Level 0
Timer A9 interrupt control register
0000F916
Timer A7
INT5 interrupt control register
Timer A6
INT6 interrupt control register
0000FD16
0000FE16
INT7 interrupt control register
0000FF16
Timer A5
INT7
Interrupts caused by the address matching detection and when dividing by zero are software interrupts and are not included in Figure
14.
Other interrupts previously mentioned are A-D converter, UART, etc.
interrupts. The priority of these interrupts can be changed by changing the priority level in the corresponding interrupt control register by
software.
Figure 15 shows a diagram of the interrupt priority detection circuit
When an interrupt is caused, each interrupt device compares its own
priority with the priority from above and if its own priority is higher,
then it sends the priority below and requests the interrupt. If the priorities are the same, the one above has priority.
This comparison is repeated to select the interrupt with the highest
priority among the interrupts that are being requested. Finally the
selected interrupt is compared with the processor interrupt priority
level (IPL) contained in the processor status register (PS) and the
request is accepted if it is higher than IPL and the interrupt disable
flag I is “0”. The request is not accepted if flag I is “1”. The reset and
watchdog timer interrupts are not affected by the interrupt disable
flag I.
When an interrupt is accepted, the contents of the processor status
register (PS) is saved to the stack and the interrupt disable flag I is
set to “1”.
Furthermore, the interrupt request bit of the accepted interrupt is
cleared to “0” and the processor interrupt priority level (IPL) in the
processor status register (PS) is replaced by the priority level of the
accepted interrupt.
Therefore, multi-level priority interrupts are possible by resetting the
interrupt disable flag I to “0” and enable further interrupts.
INT6
INT5
I N T4
INT3
A-D
Interrupt request
UART1 transmit
UART1 receive
UART0 transmit
Reset
UART0 receive
Timer B2
Timer B1
Watchdog timer
Timer B0
Timer A4
Timer A3
Timer A2
Interrupt disable flag I
Timer A1
IPL
Timer A0
Fig. 15 Interrupt priority detection
23
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MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
The interrupt request bit and the interrupt priority level of each interrupt source are sampled and latched at each operation code fetch
cycle while fsys is “H”. However, no sampling pulse is generated until
the cycles whose number is selected by software has passed, even
if the next operation code fetch cycle is generated. The detection of
an interrupt which has the highest priority is performed during that
time.
As shown in Figure 16, there are three different interrupt priority detection time from which one is selected by software. After the selected time has elapsed, the highest priority is determined and is
processed after the currently executing instruction has been completed.
The time is selected with bits 4 and 5 of the processor mode register
0 (address 5E16) shown in Figure 11. Table 6 shows the relationship
between these bits and the number of cycles. After a reset, the processor mode register 0 is initialized to “0016.” Therefore, the longest
time is automatically set, however, the shortest time must be selected by software.
Table 5. Value loaded in processor interrupt level (IPL) during an interrupt
Setting value
Interrupt types
0
Reset
7
Watchdog timer
Zero divide
Not change value of IPL.
Address matching detection
Not change value of IPL.
Table 6. Relationship between interrupt priority detection time select
bit and number of cycles
Priority detection time select bit
Bit 4
0
0
0
1
7 cycles of f sys
4 cycles of f sys
1
0
2 cycles of f sys
Note: For system clock fsys, refer to the section on the clock generating circuit.
fsys
Operation code fetch cycle
(Note)
Sampling pulse
b5 b4
Priority detection time
Select one between 00 to
10 with bits 4 and 5 of
processor mode register 0
00
01
10
Note: This pulse resides when 2 cycles of fsys is selected.
Fig. 16 Interrupt priority detection time
24
Number of cycles (Note)
Bit 5
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7
6
5
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
4
3
2
1
0
Port P2 pin function control register
Address
AE16
Pin TB0IN select bit
0: Allocate pin TB0IN to P55.
1: Allocate pin TB0IN to P24.
Pin TB1IN select bit
0: Allocate pin TB1IN to P56.
1: Allocate pin TB1IN to P25.
Pin TB2IN select bit
0: Allocate pin TB2IN to P57.
1: Allocate pin TB2IN to P26.
Pin INT3/RTPTRG0 select bit
0: Allocate pin INT3/RTPTRG0 to P74 (Note).
1: Allocate pin INT3/RTPTRG0 to P27.
Note: When pin INT3/RTPTRG0 is allocated to P74, be sure that the D-A1 output enable bit (bit 1 at address 9616) = “0”
(output disabled).
Fig. 17 Bit configuration of port P2 pin function control register
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MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
TIMER
There are eight 16-bit timers. They are divided by type into timer A
(10) and timer B (3).
The timer I/O pins are multiplexed with I/O pins for ports P2, P5 and
P6. To use these pins as timer input pins, the port direction register
bit corresponding to the pin must be cleared to “0” to specify input
mode.
TIMER A
Figure 18 shows a block diagram of timer A.
Timer A has four modes: timer mode, event counter mode, one-shot
pulse mode, and pulse width modulation mode. The mode is selected with bits 0 and 1 of the timer Ai mode register (i = 0 to 9). Each
of these modes is described below.
Figure 19 shows the bit configuration of the timer A clock division select register. Timers A0 to A9 use the count source which has been
Timer A clock
division select bit
f2
selected by bits 0 and 1 of this register.
Each of timers A3, and A5 through A8 has no its own I/O pins. Therefore, these timers are available only in the timer mode.
(1) Timer mode [00]
Figure 20 shows the bit configuration of the timer Ai mode register in
the timer mode. Bits 0, 1 and 5 of the timer Ai mode register must be
“0” in timer mode. The timer A’s count source is selected by bits 6
and 7 of the timer Ai mode register and the contents of the timer A
clock division select register. (See Table 7.)
The counting of the selected clock starts when the count start bit is
“1” and stops when it is “0”.
Figure 21 shows the bit configuration of the count start bit. The
counter is decremented, an interrupt is caused and the interrupt request bit in the timer Ai interrupt control register is set when the contents becomes 000016. At the same time, the contents of the reload
register is transferred to the counter and count is continued.
Count source
select bits
f1
f16
f64
Data bus (odd)
f512
Data bus (even)
f4096
(Low-order 8 bits)
• Timer
• One-shot pulse
• Pulse width
(High-order 8 bits)
Reload register(16)
Timer (gate function)
Counter (16)
Polarity
selection
Event counter
Count start registers 0, 1
TAiIN
(i = 0–9) (Note)
(Addresses 4016, 4116)
External trigger
Countdown
Up-down registers 0, 1
(Addresses 4416, C416)
Pulse output
Toggle flip-flop
TAiOUT
(i = 0–9) (Note)
Note: Each of timers A3, and A5 through A8 has no I/O pin.
Fig. 18 Block diagram of timer A
26
Countup/Countdown switching
“Countdown” is always
selected when not in the
event counter mode.
Addresses
Addresses
Timer A0
Timer A1
Timer A2
Timer A3
Timer A4
4716
4916
4B16
4D16
4F16
4616
4816
4A16
4C16
4E16
Timer A5
Timer A6
Timer A7
Timer A8
Timer A9
C716
C916
CB16
CD16
CF16
C616
C816
CA16
CC16
CE16
MI
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MITSUBISHI MICROCOMPUTERS
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M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
When bit 2 of the timer Ai mode register is “1”, the output is generated from TAiOUT pin. The output is toggled each time the contents
of the counter reaches to 000016. When the contents of the count
start bit is “0”, “L” is output from TAiOUT pin.
When bit 2 is “0”, TAiOUT can be used as a normal port pin. When bit
4 is “0”, TAiIN can be used as a normal port pin.
When bit 4 is “1”, counting is performed only while the input signal
from the TAiIN pin is “H” or “L” as shown in Figure 22. Therefore, this
can be used to measure the pulse width of the TAiIN input signal.
Whether to count while the input signal is “H” or while it is “L” is determined by bit 3. If bit 3 is “1”, counting is performed while the TAiIN
pin input signal is “H” and if bit 3 is “0”, counting is performed while it
is “L”.
Note that, the duration of “H” or “L” on the TAiIN pin must be 2 or
more cycles of the timer count source.
When data is written to timer Ai register with timer Ai halted, the
same data is also written to the reload register and the counter.
When data is written to timer Ai which is busy, the data is written to
the reload register, but not to the counter. The new data is reloaded
from the reload register to the counter at the next reload time and
counting continues. The contents of the counter can be read at any
time.
When the value set in the timer Ai register is n, the timer frequency
division ratio is 1/(n+1).
7
6
5
0
4
3
2
1
0
0
0
7 6 5 4 3 2 1 0
Timer A clock division select register
Address
4516
Timer A clock division select bit
(See Table 7.)
“0” at read.
Fig. 19 Bit configuration of timer A clock division select register
Table 7. Relationship between timer A clock division select bits,
clock source select bits, and count source
Clock source select bits
(bits 7 and 6 at addresses
5616 to 5A16)
(bits 7 and 6 at addresses
D616 to DA16)
00
01
10
11
Timer A clock division select bits
(bits 1 and 0 at address 4516)
00
f2
f16
f64
f512
01
f1
f16
f64
f4096
10
f1
f64
f512
f4096
11
Do not
select.
Note: Timers A0 to A9 use the same clock, which is selected by the
timer A clock division select bits.
Timer A0 mode register
Timer A1 mode register
Timer A2 mode register
Timer A3 mode register
Timer A4 mode register
Addresses
5616
5716
5816
5916
5A16
Timer A5 mode register
Timer A6 mode register
Timer A7 mode register
Timer A8 mode register
Timer A9 mode register
Addresses
D616
D716
D816
D916
DA16
0 0 : Always “00” in timer mode
0 : No pulse output (TAiOUT is normal port pin.)
1 : Pulse output (TAiOUT is pulse output pin.) (Note)
0 × : No gate function (TAiIN is normal port pin.) (Note)
1 0 : Count only while TAiIN input is “L”.
1 1 : Count only while TAiIN input is “H”.
0 : Always “0” in timer mode.
Clock source select bits
See Table 7.
Note: Each of timers A3, and A5 through A8 has no I/O pin. Therfore, fix each of these bits to “0”.
Fig. 20 Bit configuration of timer Ai mode register in timer mode
27
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7
6
5
4
3
2
1
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
0
7
Count start register 0
Address
(Stopped at “0”, Started at “1”) 4016
Timer A8 count start bit
Timer A4 count start bit
Timer A9 count start bit
Timer mode register
1
Fig. 22 Count waveform when gate function is available
28
Count start register 1
Address
(Stopped at “0”, Started at “1”)
4116
Timer A3 count start bit
Timer mode register
1
0
Timer A7 count start bit
TAiIN
Bit 3
1
Timer A2 count start bit
Selected clock source fi
Bit 4
2
Timer A6 count start bit
Fig. 21 Bit configuration of count start register
0
3
Timer A5 count start bit
Timer B2 count start bit
1
4
Timer A1 count start bit
Timer B1 count start bit
Bit 3
5
Timer A0 count start bit
Timer B0 count start bit
Bit 4
6
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M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
(2) Event counter mode [01]
count) or FFFF16 (increment count), the waveform’s polarity is reversed and is output from TAiOUT pin.
If bit 2 is “0”, TAiOUT pin can be used as a normal port pin.
However, if bit 4 is “1” and the TAiOUT pin is used as an output pin,
the output from the pin changes the count direction. Therefore, bit 4
must be “0” unless the output from the TAiOUT pin is to be used to select the count direction.
Data write and data read are performed in the same way as for timer
mode. That is, when data is written to timer Ai halted, it is also written to the reload register and the counter. When data is written to
timer Ai which is busy, the data is written to the reload register, but
not to the counter. The counter is reloaded with new data from the
reload register at the next reload time. The counter can be read at
any time.
In event counter mode, whether to increment or decrement the
counter can also be determined by supplying two kinds of pulses of
which phases differ by 90° to timer A2, A4, or A9. There are two types
of two-phase pulse processing operations. One uses timer A2, and
the other uses timers A4 and A9. In both processing operations, two
pulses described above are input to the TAjOUT (j = 2, 4, 9) pin and
TAjIN pin respectively.
When timer A2 is used, as shown in Figure 25, the count is
incremented when a rising edge is input to the TA2IN pin after the
level of TA2OUT pin changes from “L” to “H”, and when the falling
edge is input, the count is decremented.
For timers A4 and A9, as shown in Figure 26, when a phase-related
pulse with a rising edge input to the TAkIN pin is input after the level
of TAk OUT (k = 4, 9) pin changes from “L” to “H”, the count is
incremented at the respective rising edge and falling edge of the
TAkOUT pin and TAkIN pin.
Figure 23 shows the bit configuration of the timer Ai mode register in
the event counter mode. In event counter mode, bit 0 of the timer Ai
mode register must be “1” and bits 1 and 5 must be “0”.
The input signal from the TAiIN pin is counted when the count start
bit shown in Figure 21 is “1” and counting is stopped when it is “0”.
Count is performed at the fall of the input signal when bit 3 is “0” and
at the rise of the signal when it is “1”.
In event counter mode, whether to increment or decrement the count
can be selected with the up-down bit or the input signal from the
TAiOUT pin.
When bit 4 of the timer Ai mode register is “0”, the up-down bit is
used to determine whether to increment or decrement the count
(decrement when the bit is “0” and increment when it is “1”). Figure
24 shows the bit configuration of the up-down register.
When bit 4 of the timer Ai mode register is “1”, the input signal from
the TAiOUT pin is used to determine whether to increment or decrement the count. However, note that bit 2 must be “0” if bit 4 is “1”. It is
because if bit 2 is “1”, TAiOUT pin becomes an output pin to output
pulses.
The count is decremented when the input signal from the TAiOUT pin
is “L” and incremented when it is “H”. Determine the level of the input
signal from the TAiOUT pin before a valid edge is input to the TAiIN
pin.
An interrupt request signal is generated and the interrupt request bit
in the timer Ai interrupt control register is set when the counter
reaches 000016 (decrement count) or FFFF16 (increment count). At
the same time, the contents of the reload register is transferred to the
counter and the count is continued.
When bit 2 is “1”, each time the counter reaches 000016 (decrement
7
×
6
×
5
0
4
3
2
1
0
0
1
Timer A0 mode register
Timer A1 mode register
Timer A2 mode register
Timer A3 mode register
Timer A4 mode register
Addresses
5616
5716
5816
5916
5A16
Timer A5 mode register
Timer A6 mode register
Timer A7 mode register
Timer A8 mode register
Timer A9 mode register
Addresses
D616
D716
D816
D916
DA16
0 1 : Always “01” in event counter mode
0 : No pulse output
1 : Pulse output
0 : Count at the falling edge of input signal
1 : Count at the rising edge of input signal
0 : Increment or decrement according to up/down bit
1 : Increment or decrement according to TAiOUT pin input signal level
0 : Always “0” in event counter mode
× × : Not used in event counter mode
Note: Each of timers A3, and A5 through A8 has no I/O pin. Therefore, this mode cannot be selected
for these timers.
Fig. 23 Bit configuration of timer Ai mode register in event counter mode
29
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7
6
5
4
3
2
1
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
0
Up-down register 0
Address
4416
7
6
5
4
3
2
1
0
Address
C416
Up-down register 1
Timer A0 up-down bit
Timer A5 up-down bit
Timer A1 up-down bit
Timer A6 up-down bit
Timer A2 up-down bit
Timer A7 up-down bit
Timer A3 up-down bit
Timer A8 up-down bit
Timer A4 up-down bit
Timer A9 up-down bit
Timer A2 two-phase pulse signal
processing select bit
0 : Two-phase pulse signal processing
disabled
1 : Two-phase pulse signal processing
mode
Timer A7 two-phase pulse signal
processing select bit
0 : Two-phase pulse signal processing
disabled
1 : Two-phase pulse signal processing
mode
Timer A3 two-phase pulse signal
processing select bit
0 : Two-phase pulse signal processing
disabled
1 : Two-phase pulse signal processing
mode
Timer A8 two-phase pulse signal
processing select bit
0 : Two-phase pulse signal processing
disabled
1 : Two-phase pulse signal processing
mode
Timer A4 two-phase pulse signal
processing select bit
0 : Two-phase pulse signal processing
disabled
1 : Two-phase pulse signal processing
mode
Timer A9 two-phase pulse signal
processing select bit
0 : Two-phase pulse signal processing
disabled
1 : Two-phase pulse signal processing
mode
Note: Each of timers A3, and A5 through A8 has no I/O pin. Therefore, the content of this bit is invalid.
Fig. 24 Bit configuration of up-down register
TA2OUT
TA2IN
Incrementcount
Incrementcount
Incrementcount
Decrementcount
Decrementcount
Decrementcount
Fig. 25 Two-phase pulse processing operation of timer A2
TAkOUT
Increment-count at each edge
Decrement-count at each edge
TAkIN
(k = 4, 9)
Increment-count at each edge
When a phase-related pulse with a falling edge input to the TAkOUT
pin is input after the level of TAkIN pin changes from “H” to “L”, the
count is decremented at the respective rising edge and falling edge
of the TAkIN pin and TAkOUT pin. When performing this two-phase
pulse signal processing, timer Aj mode register bit 0 and bit 4 must
be set to “1” and bits 1, 2, 3, and 5 must be “0”. Bits 6 and 7 are ignored. (See Figure 27.) Note that bits 5 and 7 of the up-down register 0 (address 4416) are the two-phase pulse signal processing
select bits for timers A2 and A4 respectively. Also, bit 7 of the updown register 1 (address C416) is the two-phase pulse signal processing select bit for timer A9. Each timer operates in normal event
counter mode when the corresponding bit is “0” and performs twophase pulse signal processing when it is “1”.
Count is started by setting the count start bit to “1”. Data write and
read are performed in the same way as for normal event counter
mode. Note that the direction register of the input port must be set to
input mode because two kinds of pulse signals, described above,
are input. Also, there can be no pulse output in this mode.
Decrement-count at each edge
Fig. 26 Two-phase pulse processing operation of timers A4 and A9
7
×
6
×
5
0
4
1
3
0
2
0
1
0
0
1
Timer A2 mode register
Timer A4 mode register
Timer A9 mode register
Addresses
5816
5A16
CA16
0 1 : Always “01” in event counter mode
0 1 0 0 : Always “0100” when processing
two-phase pulse signal
× × : Not used in event counter mode
Fig. 27 Bit configuration of timer Aj mode register when performing
two-phase pulse signal processing in event counter mode
30
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M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
(3) One-shot pulse mode [10]
The output pulse width is
Figure 28 shows the bit configuration of the timer Ai mode register in
the one-shot pulse mode. In one-shot pulse mode, bit 0 and bit 5
must be “0” and bit 1 and bit 2 must be “1”.
The trigger is enabled when the count start bit is “1”. The trigger can
be generated by software or it can be input from the TAiIN pin. Software trigger is selected when bit 4 is “0” and the input signal from the
TAiIN pin is used as the trigger when it is “1“.
Bit 3 is used to determine whether to trigger at the fall of the trigger
signal or at the rise. The trigger is at the fall of the trigger signal when
bit 3 is “0” and at the rise of the trigger signal when it is “1”.
Software trigger is generated by setting “1” to a bit in the one-shot
start register. Each bit corresponds to each timer.
Figure 29 shows the bit configuration of the one-shot start register.
As shown in Figure 30, when a trigger signal is received, the counter
counts the clock selected by bits 6 and 7 and the contents of the
timer A clock division select register. (Set Table 7.)
If the contents of the counter is not 000016, the TAiOUT pin goes “H”
when a trigger signal is received. The count direction is decrement.
When the counter reaches 000116, the TAiOUT pin goes “L” and
count is stopped. The contents of the reload register is transferred to
the counter. At the same time, an interrupt request signal is generated and the interrupt request bit in the timer Ai interrupt control register is set. This is repeated each time a trigger signal is received.
7
6
5
0
4
3
2
1
1
1
0
0
Timer A0 mode register
Timer A1 mode register
Timer A2 mode register
Timer A3 mode register
Timer A4 mode register
1
pulse frequency of the selected clock
× (counter’s value at the time of trigger).
If the count start flag is “0”, TAiOUT goes “L”. Therefore, the value corresponding to the desired pulse width must be written to timer Ai before setting the timer Ai count start bit.
As shown in Figure 31, a trigger signal can be received before the
operation for the previous trigger signal is completed. In this case,
the contents of the reload register is transferred to the counter by the
trigger and then that value is decremented.
Except when retriggering while operating, the contents of the reload
register are not transferred to the counter by triggering.
When retriggering, there must be at least one timer count source
cycle before a new trigger can be issued.
Data write is performed in the same way as for timer mode.
When data is written in timer Ai halted, it is also written to the reload
register and the counter.
When data is written to timer Ai which is busy, the data is written to
the reload register, but not to the counter. The counter is reloaded
with new data from the reload register at the next reload time.
Undefined data is read when timer Ai is read.
Address
5616
5716
5816
5916
5A16
Timer A5 mode register
Timer A6 mode register
Timer A7 mode register
Timer A8 mode register
Timer A9 mode register
Address
D616
D716
D816
D916
DA16
1 0 : Always “10” in one-shot pulse mode
1 : Always “1” in one-shot pulse mode
0 × : Software trigger
1 0 : Trigger at the falling edge of TAiIN input
1 1 : Trigger at the rising edge of TAiIN input
0 : Always “0” in one-shot pulse mode
Clock source select bits
(See Table 7.)
Note: Each of timers A3, and A5 through A8 has no I/O pin. Therefore, this mode cannot be selected for these timers.
Fig. 28 Bit configuration of timer Ai mode register in one-shot pulse mode
31
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7 6
0
5
4
3
2
1
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
0
One-shot start register 0
Address
4216
7 6
0
5
4
Timer A0 one-shot start bit
Timer A1 one-shot start bit
Timer A2 one-shot start bit
Timer A3 one-shot start bit
Timer A4 one-shot start bit
Fix this bit to “0”.
Fig. 29 Bit configuration of one-shot start register
Selected clock
source fi
TAiIN
(rising edge)
TAiOUT
Example when the contents of the reload register is 000316
Fig. 30 Pulse output example when external rising edge is selected
Selected clock
source fi
TAiIN
(rising edge)
TAiOUT
Example when the contents of the reload register is 000416
Fig. 31 Example when trigger is re-issued during pulse output
32
3
2
1
0
One-shot start register 1
Timer A5 one-shot start bit
Timer A6 one-shot start bit
Timer A7 one-shot start bit
Timer A8 one-shot start bit
Timer A9 one-shot start bit
Fix this bit to “0”.
Address
4316
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MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
(4) Pulse width modulation mode [11]
Figure 32 shows the bit configuration of the timer Ai mode register in
the pulse width modulation mode. In pulse width modulation mode,
bits 0, 1, and 2 must be set to “1”.
Bit 5 is used to determine whether to perform 16-bit length pulse
width modulator or 8-bit length pulse width modulator. 16-bit length
pulse width modulator is selected when bit 5 is “0” and 8-bit length
pulse width modulator is selected when it is “1”. The 16-bit length
pulse width modulator is described first.
The pulse width modulator can be started with a software trigger or
with an input signal from a TAiIN pin (external trigger).
The software trigger mode is selected when bit 4 is “0”.
Pulse width modulator is started and a pulse is output from TAiOUT
when the count start bit is set to “1”.
The external trigger mode is selected when bit 4 is “1”.
Pulse width modulation starts when a trigger signal is input from the
TAiIN pin when the count start bit is “1”. Whether to trigger at the fall
or rise of the trigger signal is determined by bit 3. The trigger is at the
fall of the trigger signal when bit 3 is “0” and at the rise when it is “1”.
When data is written to timer Ai with the pulse width modulator
halted, it is written to the reload register and the counter.
Then when the count start bit is set to “1” and a software trigger or
an external trigger is issued to start modulation, the waveform shown
in Figure 33 is output continuously.
Once modulation is started, triggers are not accepted. If the value in
the reload register is m, the duration “H” of pulse is
1
×m
selected clock frequency
The width of the output pulse is changed by updating timer data. The
update can be performed at any time. The output pulse width is
changed at the rise of the pulse after data is written to the timer.
The contents of the reload register are transferred to the counter just
before the rise of the next pulse so that the pulse width is changed
from the next output pulse.
Undefined data is read when timer Ai is read.
The 8-bit length pulse width modulator is described next.
The 8-bit length pulse width modulator is selected when the timer Ai
mode register bit 5 is “1”.
The reload register and the counter are both divided into 8-bit
halves.
The low-order 8 bits function as a prescaler and the high-order 8 bits
function as the 8-bit length pulse width modulator. The prescaler
counts the clock selected by bits 6, 7, and the contents of the timer A
clock division select register. (See Table 7.) A pulse is generated
when the counter reaches 000016 as shown in Figure 34. At the
same time, the contents of the reload register is transferred to the
counter and count is continued.
Therefore, if the low-order 8 bits of the reload register are n, the period of the generated pulse is
1
selected clock frequency
The high-order 8 bits function as an 8-bit length pulse width modulator using this pulse as input. The operation is the same as for 16-bit
length pulse width modulator except that the length is 8 bits. If the
high-order 8 bits of the reload register are m, the duration “H” of
pulse is
and the output pulse period is
1
× (n + 1) × m.
selected clock frequency
1
× (216 – 1).
selected clock frequency
And the output pulse period is
An interrupt request signal is generated and the interrupt request bit
in the timer Ai interrupt control register is set at each fall of the output
pulse.
7
6
5 4
3
2
1
1 0
1 1
× (n + 1).
Timer A0 mode register
Timer A1 mode register
Timer A2 mode register
Timer A3 mode register
Timer A4 mode register
1
× (n + 1) × (28 – 1).
selected clock frequency
Address
5616
5716
5816
5916
5A16
Timer A5 mode register
Timer A6 mode register
Timer A7 mode register
Timer A8 mode register
Timer A9 mode register
Address
D616
D716
D816
D916
DA16
1 1 : Always “11” in pulse width modulation mode
1 : Always “1” in pulse width modulation mode
0 × : Software trigger
1 0 : Trigger at the falling of TAiIN input
1 1 : Trigger at the rising of TAiIN input
0 : 16-bit pulse width modulator
1 : 8-bit pulse width modulator
Clock source select bits
(See Table 7.)
Note: Each of timers A3, and A5 through A8 has no I/O pin. Therefore, this mode cannot be selected for these timers.
Fig. 32 Bit configuration of timer Ai mode register in pulse width modulation mode
33
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MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
1/fi × (216 – 1)
Selected clock
source fi
TAiIN
(rising edge)
This trigger is not accepted
1/fi × (m)
TAiOUT
Example when the contents of the reload register is 000316
Fig. 33 16-bit length pulse width modulator output pulse example
1/fi × (n + 1) × (28 – 1)
Selected clock
source fi
TAiIN
(falling edge)
1/fi × (n + 1)
Prescaler output
(when n = 2)
1/fi × (n + 1) × (m)
8-bit length pulse
width modulator
output
(when m = 2)
Fig. 34 8-bit length pulse width modulator output pulse example
34
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M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
TIMER B
the same address to which some of the timer Ai’s count start bits are
allocated. (In other words, they are allocated in the count start register 0.) The count is decremented, an interrupt occurs, and the interrupt request bit in the timer Bi interrupt control register is set when
the contents becomes 000016. At the same time, the contents of the
reload register is stored in the counter and count is continued.
Timer Bi does not have a pulse output function or a gate function like
timer A.
When data is written to timer Bi halted, it is written to the reload register and the counter. When data is written to timer Bi which is busy,
the data is written to the reload register, but not to the counter. The
new data is reloaded from the reload register to the counter at the
next reload time and counting continues.
The contents of the counter can be read at any time.
Figure 35 shows a block diagram of timer B.
Timer B has three modes: timer mode, event counter mode, and
pulse period measurement/pulse width measurement mode. The
mode is selected with bits 0 and 1 of the timer Bi mode register (i=0
to 2). Each of these modes is described below.
(1) Timer mode [00]
Figure 36 shows the bit configuration of the timer Bi mode register in
the timer mode. Bits 0 and 1 of the timer Bi mode register must always be “0” in timer mode.
Bits 6 and 7 are used to select the clock source. The counting of the
selected clock starts when the count start bit is “1” and stops when
“0”.
As shown in Figure 21, the timer Bi’s count start bits are allocated at
Data bus (odd)
Count source select bits
f2
f16
f64
Data bus (even)
f512
(Low-order 8 bits)
• Timer mode
• Pulse period measurement/Pulse
width measurement mode
TBiIN
Polarity selection
and edge pulse
generator
(High-order 8 bits)
Reload register (16)
• Event counter
mode
Counter (16)
fX32
Timer B2 clock source
select bit (Note 2)
Count start register 0
Addresses
Timer B0 5116 5016
Timer B1 5316 5216
Timer B2 5516 5416
(Address 4016)
Counter reset
circuit
Timer B2 clock source select bit : Bit 6 at address 6316
Notes 1: Perform a write and read to/from timer Bi register in the condition of 16-bit data length : data length flag (m) = “0”.
2: Only for timer B2, a count source in the event counter mode can be selected.
Fig. 35 Block diagram of timer B
35
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REL
MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
(2) Event counter mode [01]
Figure 37 shows the bit configuration of the timer Bi mode register in
the event counter mode. In event counter mode, bit 0 in the timer Bi
mode register must be “1” and bit 1 must be “0”.
The input signal from the TBiIN pin is counted when the count start
bit is “1” and counting is stopped when it is “0”.
Count is performed at the fall of the input signal when bits 2 and 3
are “0” and at the rise of the input signal when bit 3 is “0” and bit 2 is
“1”.
When bit 3 is “1” and bit 2 is “0”, count is performed at the rise and
fall of the input signal.
Data write, data read and timer interrupt are performed in the same
way as for timer mode.
Only for timer B2, when the timer B2 clock source select bit of the
particular function select register 1 (bit 6 at address 6316) = “1” in the
event counter mode, fX32 (Note) can be selected. (When this bit is
“0”, an input signal from pin TB2IN becomes the count source as described above.) For the bit configuration of the particular function
select register 1, refer to the section on the standby function.
Also, the pin position where pin TBiIN is to be allocated can be selected by the pin TBiIN select bit (bit 0, 1, or 2 at address AE16; the
port P2 pin function control register).
Note: fX32 = f(XIN)/32
16-BIT CMOS MICROCOMPUTER
measurement mode except that the clock is counted from the fall of
the TBiIN pin input signal to the next rise or from the rise of the input
signal to the next fall as shown in Figure 40.
7 6 5 4 3 2 1 0
× × × × 0 0
36
Address
5B16
5C16
5D16
0 0 : Always “00” in timer mode
× × × : Not used in timer mode and
may be any
Not used in timer mode
Clock source select bits
0 0 : Select f2
0 1 : Select f16
1 0 : Select f64
1 1 : Select f512
Fig. 36 Bit configuration of timer Bi mode register in timer mode
7 6 5 4 3 2 1 0
× × × ×
0 1
Timer B0 mode register
Timer B1 mode register
Timer B2 mode register
Address
5B16
5C16
5D16
0 1 : Always “01” in event counter
mode
0 0 : Count at the falling edge of
input signal
0 1 : Count at the rising edge of
input signal
1 0 : Count at the both falling edge
and rising edge of input signal
(3) Pulse period measurement/Pulse width
measurement mode [10]
Figure 38 shows the bit configuration of the timer Bi mode register in
the pulse period measurement/pulse width measurement mode.
In the pulse period measurement/pulse width measurement mode,
bit 0 must be “0” and bit 1 must be “1”. Bits 6 and 7 are used to select
the clock source. The selected clock is counted when the count start
bit is “1” and counting stops when it is “0”.
The pulse period measurement mode is selected when bit 3 is “0”. In
the pulse period measurement mode, the selected clock is counted
during the interval starting at the fall of the input signal from the TBiIN
pin to the next fall or at the rise of the input signal to the next rise; the
result is stored in the reload register. In this case, the reload register
acts as a buffer register.
When bit 2 is “0”, the clock is counted from the fall of the input signal
to the next fall. When bit 2 is “1“, the clock is counted from the rise of
the input signal to the next rise.
In the case of counting from the fall of the input signal to the next fall,
counting is performed as follows. As shown in Figure 39, when the
fall of the input signal from TBiIN pin is detected, the contents of the
counter is transferred to the reload register. Next, the counter is
cleared and count is started from the next clock. When the fall of the
next input signal is detected, the contents of the counter is transferred to the reload register once more, the counter is cleared, and
the count is started. The period from the fall of the input signal to the
next fall is measured in this way.
After the contents of the counter is transferred to the reload register,
an interrupt request signal is generated and the interrupt request bit
in the timer Bi interrupt control register is set. However, no interrupt
request signal is generated when the contents of the counter is transferred first to the reload register after the count start bit is set to “1”.
When bit 3 is “1”, the pulse width measurement mode is selected.
Pulse width measurement mode is the same as the pulse period
Timer B0 mode register
Timer B1 mode register
Timer B2 mode register
× × × × : Not used in event counter mode
Fig. 37 Bit configuration of timer Bi mode register in event counter mode
7 6 5 4 3 2 1 0
1 0
Timer B0 mode register
Timer B1 mode register
Timer B2 mode register
Address
5B16
5C16
5D16
1 0 : Always “10” in pulse period
measurement/pulse width
measurement mode
0 0 : Count from the falling edge of
input signal to the next falling one
0 1 : Count from the rising edge of
input signal to the next rising one
1 0 : Count from the falling edge of
input signal to the next rising one
and from the rising edge to the
next falling one
Conut-type select bit
0 : Counter-clear type
1 : Free-run type
Timer Bi overflow flag
Clock source select bits
0 0 : Select f2
0 1 : Select f16
1 0 : Select f64
1 1 : Select f512
Fig. 38 Bit configuration of timer Bi mode register in pulse period
measurement/pulse width measurement mode
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MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
When timer Bi is read, the contents of the reload register is read.
Note that in this mode, the interval between the fall of the TBiIN pin
input signal to the next rise or from the rise to the next fall must be at
least two cycles of the timer count source.
Timer Bi overflow flag which is bit 5 of timer Bi mode register is set to
“1” when the timer Bi counter reaches 000016, which indicates that a
pulse width or pulse period is longer than that which can be measured by a 16-bit length.
16-BIT CMOS MICROCOMPUTER
This flag is cleared by writing data to the corresponding timer Bi
mode register. This flag is set to “1”at reset.
In these modes, the count type can be selected by the count-type
select bit (bit 4 of the timer Bi mode register). When this bit = “1”, the
free-run type is selected; in this case, even when a valid edge is input to pin TBiIN, the contents of the counter will not be cleared to
“000016”, and counting will continue. However, when a valid edge is
input, an interrupt-requesting signal will be generated.
Selected clock
source fi
TBiIN
Reload register ← Counter
Counter ← 0
Count start bit
Interrupt request signal
Fig. 39 Pulse period measurement mode operation (example of measuring the interval between the falling edge to next falling one)
Selected clock
source fi
TBiIN
Reload register ← Counter
Counter ← 0
Count start bit
Interrupt request signal
Fig. 40 Pulse width measurement mode operation
37
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MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
TIMER FUNCTION FOR MOTOR CONTROL
Three-phase motor drive waveform or pulse motor drive waveform
can be output by using plural internal timers As. These modes are
explained bellow.
16-BIT CMOS MICROCOMPUTER
7
6
5
×
4
3
2
1
1
0
0
0
Waveform output mode register
Waveform output select bits
100 : Fix to “100” in three-phase
waveform mode
Three-phase motor drive waveform output
mode (three-phase waveform mode)
Three-phase waveform mode using timers A0, A1, A2 and A3 is selected by setting the waveform output select bits of the waveform
output mode register (bits 2 through 0 at address A616, Figure 41) to
“1002”.
There are two types of the three-phase waveform mode: threephase mode 0 and three-phase mode 1. Bit 4 of the waveform output mode register selects either mode. In the three-phase waveform
mode, set the corresponding timer mode registers of timers A0, A1,
and A2 to select the one-shot pulse mode with the rising edge of an
external trigger valid; set the timer mode register of timer A3 to select the timer mode.
Figure 43 shows the block diagram in the three-phase waveform
mode. The three-phase waveform mode outputs six waveforms,
positive waveforms (U, V, W phases) and negative waveforms (U, V,
W phases), from the respective ports with “L” level active.
Timer A2 controls U and U phases; timer A1 does V and V phases
and timer A0 does W and W phases. Timer A3 controls these oneshot pulses’ periods of timers A2, A1 and A0.
In the waveform output, a short circuit prevention time can be set to
prevent “L” level of positive waveform outputs (U, V, W phases) from
overlapping with “L” level of their negative waveform outputs (U, V,
W phases). The short circuit prevention time can be set with three 8bit dead-time timers, sharing one reload register. The dead-time
timer operates as a one-shot timer. It’s start trigger is selected from
the following two types: both the rising and falling edges of timers A0
to A2’s one-shot pulses or their falling edges. Additionally, bit 6 of the
waveform output mode register (address A616) controls this selection. When that bit is “0”, both the rising and falling edges are selected; when that bit is “1”, the falling edges are selected.
Address
A616
(Valid in three-phase mode 1)
Three-phase output polarity set buffer
0 : “H” output
1 : “L” output
Three-phase mode select bit
0 : Three-phase mode 0
1 : Three-phase mode 1
Not used in three-phase
waveform mode
Dead-time timer trigger select bit
0 : Both edge of one-shot pulse
with timers A2 to A0
1 : Only the falling edge of one-shot
pulse with timers A2 to A0
Waveform output control bit
0 : Waveform output disabled
1 : Waveform output enabled
Fig. 41 Bit configuration of waveform output mode register in threephase waveform mode
7
6
5
0
4
1
3
1
2
0
1
1
0
0
Timer A0 mode register
Timer A1 mode register
Timer A2 mode register
Address
5616
5716
5816
Fix to “10” in three-phase
waveform mode
Fix to “0110” in three-phase
waveform mode
Clock source select bits
(See Table 7.)
7
6
5
0
4
0
3
0
2
0
1
0
0
0
Timer A3 mode register
Address
5916
Fix to “000000” in three-phase
waveform mode
Clock source select bits
(See Table 7.)
Fig. 42 Bit configuration of timer A0, A1, A2, mode register and
timer A3 mode register in three-phase waveform mode
38
Timer A3 (16)
T
Timer A21
Timer A11
Timer A01
W-phase output polarity
set buffer
(bit 3 at address A816)
Timer A0 counter (16)
(One-shot pulse mode)
Reload
V-phase output polarity
set buffer
(bit 4 at address A916)
Timer A1 counter (16)
(One-shot pulse mode)
Reload
U-phase output polarity
set buffer
(bit 5 at address A916)
(One-shot pulse mode)
Timer A0
T
Reload
Timer A2 counter (16)
Timer A1
T
Timer A2
DQ
DQ
DQ
Reset
“1”
“0”
“1”
“0”
“1”
“0”
SQ
T
RQ
SQ
T
RQ
SQ
T
RQ
Q D Three-phase mode
select bit
R (bit 4 at address A616)
Output polarity
set toggle
flip-flop 0
Output polarity
set toggle
flip-flop 1
Output polarity
set toggle
flip-flop 2
Reset
R
Interval control
circuit
f2
1/2
1/2
Trigger generating circuit
W-phase
W-phase output fix polarity set bit output
control
(bit 0 at address D Q
circuit
A916)
W-phase output fix bit
(bit 0 at address
A816)
DQ
T
Trigger generating circuit
V-phase output fix bit
(bit 1 at address
A816)
DQ
T
V-phase
V-phase output fix polarity set bit output
(bit 1 at address D Q
control
A916)
circuit
f8
f4
Dead-time
timer (8)
Dead-time
timer (8)
T
T
Reset
T
DQ
T
DQ
T
DQ
T
DQ
T
DQ
T
DQ
b0
b1
b2
P6OUTCUT
Bits 2 through 0 of positiondata-retain function control
register (address AA16)
Dead-time
timer (8)
T
Clock-source-of-dead-time-timer
select bits
(bits 7, 6 at address A816)
Reload register
Timer A3 interrupt request signal
Trigger generating circuit
U-phase output fix bit
(bit 2 at address
DQ
A816)
T
U-phase
U-phase output fix polarity set bit output
control
(bit 2 at address
DQ
circuit
A916)
“0”
“1”
Q D
T
T
Q D
Q D
T
R
DQ
IDW
IDV
IDU
W
W
V
V
U
U
Waveform output control bit
(bit 7 at address A616)
RY
(Timer mode)
TR
DQ
Reset
L
R
DQ
PRE
Three-phase output
polarity set buffer
(bit 3 at address A616)
Interrupt validity
output select bit
(bit 5 at address A916)
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A
IMIN
Data bus (even-numbered)
Interrupt request interval set bit
(bit 4 at address A916)
DQ
MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
Fig. 43 Block diagram in three-phase waveform mode
39
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MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
When writing data to the dead-time timer (address A716), the data is
written to the reload register shared by three dead-time timers.
When the dead-time timers catch the start trigger from the respective timers, the reload register contents are transferred to its counter
and the dead-time timer decrements with the clock source selected
by bits 6 and 7 of three-phase output data register 0 (address A816).
Additionally, this timer can accept another trigger before completion
of the preceding trigger operation. In this case, after transferring the
reload register contents to the dead-time timer at acceptance of the
trigger, the value is decremented.
The dead-time timer operates as a one-shot pulse timer. Accordingly,
this timer starts pulse output when the trigger is caught, and finishes
pulse output and stops operation when its contents become “0016”,
and waits next trigger.
7
6
5
×
4
×
3
2
1
0
Three-phase output data register 0
Address
A816
In the three-phase waveform mode, setting bit 7 of the waveform
output mode register (address A616) to “1” makes positive waveforms (U, V, W phases) and their negative waveforms (U, V, W
phases) output from the respective ports. When this bit is “0”, their
ports are floating. This bit is cleared to “0” by inputting a falling edge
to pin P6OUTCUT, by reset, or by executing instructions.
Additionally, setting bits 2 through 0 of the three-phase output data
register 0 (address A816) to “1” makes the corresponding waveform
outputs fixed. Whether the outputs are fixed to “H” or “L” is selected
by bits 2 through 0 of the three-phase output data register 1 (address
A916). Clearing these bits to “0” makes the corresponding waveform
outputs fixed to “H”; setting these bits to “1” makes the outputs fixed
to “L”.
7
×
6
×
5
4
3 2
×
1
0
Three-phase output data register 1
Address
A916
W-phase output fix bit
0 : Released from output fixation
1 : Output fixed
W-phase fixed output’s polarity set bit
0 : “H” output fixed
1 : “L” output fixed
V-phase output fix bit
0 : Released from output fixation
1 : Output fixed
V-phase fixed output’s polarity set bit
0 : “H” output fixed
1 : “L” output fixed
U-phase output fix bit
0 : Released from output fixation
1 : Output fixed
U-phase fixed output’s polarity set bit
0 : “H” output fixed
1 : “L” output fixed
When three-phase mode 0 is selected:
W-phase output polarity set buffer
0 : “H” output
1 : “L” output
When three-phase mode 1 is selected:
It may be either “0” or “1”.
In three-phase waveform mode, this bit is invalid.
It may be either “0” or “1”.
In three-phase waveform mode, these bits
are invalid.
Any of them may be either “0” or “1”.
Clock-source-of-dead-time-timer select bits
0 0 : f2
0 1 : f4
1 0 : f8
1 1 : Do not select.
When three-phase mode 0 is selected:
V-phase output polarity set buffer
0 : “H” output
1 : “L” output
When three-phase mode 1 is selected:
Interrupt request interval set bit
0 : Every second time
1 : Every fourth time
When three-phase mode 0 is selected:
U-phase output polarity set buffer
0 : “H” output
1 : “L” output
When three-phase mode 1 is selected:
Interrupt validity output select bit
0 : An interrupt request occurs at each
even-numbered underflow of timer A3.
1 : An interrupt request occurs at each
odd-numbered underflow of timer A3.
In three-phase waveform mode, these bits are invalid.
Any of them may be either “0” or “1”.
Fig. 44 Bit configuration of three-phase output data registers 1 and 0 in three-phase waveform mode
40
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PRE
L
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
Three-phase mode 0
In selecting three-phase waveform mode, three-phase mode 0 is selected by setting bit 4 of the waveform output mode register (address
A616) to “0”.
The output polarity of three-phase waveform depends on the output
polarity set toggle flip-flop. The positive waveform of the three-phase
waveform is “H” output when the toggle flip-flop is “0”; it is “L” output
when the toggle flip-flop is “1”. (Three-phase waveform is output as
a negative waveform.)
Each output polarity set toggle flip-flop has the output polarity set
buffer shown in Figure 44. When the timer A3’s counter contents become 000016, the contents of output polarity set buffer are set into
the output polarity set toggle flip-flop. After that, the polarity of the
contents of output polarity set toggle flip-flop are reversed each time
completion of one-shot pulse of timer (timers A2 to A0) corresponding to each phase.
Figure 45 shows an example of U-phase waveform and the output
operation is explained. Three-phase mode 0 becomes valid when
writing “0” to the U-phase output polarity set buffer (bit 5 at address
A916) and actuating the timer A3. When the counter of timer A3 becomes 000016, the timer A3 interrupt request signal occurs and the
timer A2 simultaneously starts one-shot pulse output. At this time,
the contents of U-phase output polarity set buffer, “0” in this case, are
set into the output polarity set toggle flip-flop 2.
When the one-shot pulse output of timer A2 is completed, the contents of output polarity set toggle flip-flop 2 is reversed from “0” to “1”.
Simultaneously, the one-shot pulse of the 8-bit dead-time timer is
output for ensuring time not to overlap “L” levels of U phase waveform and its negative U phase waveform.
The U-phase waveform output keeps “H” level from the start until the
one-shot pulse output of the dead-time timer is completed, even if
the contents of output polarity set toggle flip-flop 2 are reversed from
“0” to “1” owing to the timer A2’s one-shot pulse output. When the
one-shot pulse output of the dead-time timer is completed, “1” of
output polarity set toggle flip-flop 2 which has been reversed becomes valid and the U phase waveform changes to “L” level.
16-BIT CMOS MICROCOMPUTER
Then, write “1” to the U-phase output polarity set buffer (bit 5 at address A916) before the counter of timer A3 becomes 000016.
After that, when the counter of timer A3 becomes 000016, the timer
A2 starts one-shot pulse output. Simultaneously, the contents of Uphase output polarity set buffer, “1” in this case, are set into the output polarity set toggle flip-flop 2 and the U phase waveform remains
“L” level.
When the one-shot pulse output of timer A2 is completed, the contents of output polarity set toggle flip-flop 2 is reversed from “1” to “0”.
Simultaneously, the one-shot pulse output of the dead-time timer
starts.
When the contents of output polarity set toggle flip-flop 2 are reversed from “1” to “0”, the U-phase waveform changes its output
level from “L” to “H” without waiting for completion of the one-shot
pulse output of the dead-time timer.
U-phase waveform is generated by repeating the operation above.
The way to generate U-phase waveform, which is the negative
phase of U-phase, is the same as that for U-phase waveform except
that the contents of output polarity set toggle flip-flop 2 are treated as
the reversed signal from the case of U-phase waveform.
In this way, U-phase waveform and U-phase waveform, having the
negative phase of U-phase, are output from the pins so that their “L”
levels do not overlap each other. The width of “L” level can be also
modified by changing the value of timer A2 or A3.
V-, W-phase waveform and V-, W-phase waveform, having their
negative phase, are similarly output according to the corresponding
timer operation.
The explanation above is an example of three-phase waveform generating due to an triangular wave modulation. Three-phase waveform due to a saw-tooth-wave modulation can also be generated by
fixing each beginning level of phases.
Signal output each time
Timer A3 becomes 000016
One-shot pulse output
with timer A2
Contents of output polarity
set toggle flip-flop 2
Reversed pulse output
signal with dead-time timer
U-phase waveform output
U-phase waveform output
Fig. 45 U-phase waveform output example in three-phase mode 0 (triangular wave modulation)
41
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MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
Three-phase mode 1
In selecting three-phase waveform mode, three-phase mode 1 is
selected by setting bit 4 of the waveform output mode register (address A616) to “1”.
In this mode, each of timers A0 to A2 can have two timer registers
and the contents of those registers are alternately reloaded into the
counter each time the counter of timer A3 becomes 000016.
The interrupt request normally occurs when the counter of timer A3
becomes 000016. However, this occurrence interval can be switched
between “every second time” and “every fourth time.” Bit 4 of the
pulse output data register 1 (address A916) selects that.
Additionally, an even-numbered or odd-numbered timer A3’s underflow can be used as the occurrence factor of timer A3 interrupt request. Bit 5 of the three-phase output data register 1 (address A916)
selects that.
When the timer A3’s counter contents become 000016, the contents
of three-phase output polarity set buffer are set into the output polarity set toggle flip-flop on which the output polarity of three-phase
waveform depends. The contents of three-phase output polarity set
buffer are reversed after that operation.
The polarity of the contents of output polarity set toggle flip-flop is reversed each time completion of one-shot pulse of timer (timers A2 to
A0) corresponding to each phase.
Figure 46 shows an example of U-phase waveform and the output
operation is explained.
Write “0” to the three-phase-output-polarity set buffer (bit 3 at address A616). Clear the interrupt request interval set bit (bit 4 at address A916) to “0” so that the timer A3 interrupt request occurs at
every second time. Additionally, clear the interrupt validity output select bit (bit 5 at address A916) so that the timer A3 interrupt request
occurs at an each even-numbered underflow of timer A3.
After the procedure above, three-phase mode 1 starts operation
when actuating timer A3.
When the counter of timer A3 becomes 000016, the timer A3 interrupt
request occurs and timer A2 simultaneously starts one-shot pulse
output. At this time, the contents of three-phase output polarity set
buffer, “0” in this case, are set into the output polarity set toggle flipflop 2. The contents of three-phase output polarity set buffer are reversed from “0” to “1” after that operation.
When the timer A2 counter counts the value written into the timer A2
and the one-shot pulse output of timer A2 is completed, the contents
of output polarity set toggle flip-flop 2 are reversed from “0” to “1”. Simultaneously, the one-shot pulse of the 8-bit dead-time timer is output for ensuring time, so that “L” levels of U- and U-phase waveforms
do not overlap.
The U-phase waveform output keeps “H” level from the start until the
one-shot pulse output of the dead-time timer is completed, even if
the contents of output polarity set toggle flip-flop 2 are reversed from
“0” to “1” owing to the timer A2’s one-shot pulse output.
When the one-shot pulse output of the dead-time timer is completed,
“1” of output polarity set toggle flip-flop 2 which has been reversed
becomes valid and the U-phase waveform changes to “L” level.
Then, when the counter of timer A3 becomes 000016, the timer A2
counter counts the value written into timer A2 and timer A2 starts
one-shot pulse output. Simultaneously, the contents of three-phase
output polarity set buffer are set into the output polarity set toggle
flip-flop 2. However, the U-phase waveform remains “L” level, be-
42
16-BIT CMOS MICROCOMPUTER
cause the value is the same (“1”).
The contents of three-phase output polarity set buffer are reversed
from “1” to “0” after that operation.
When the one-shot pulse output of timer A2 is completed, the contents of output polarity set toggle flip-flop 2 is reversed from “1” to “0”.
Simultaneously, the one-shot pulse output of the dead-time timer
starts.
When the contents of output polarity set toggle flip-flop 2 is reversed
from “1” to “0”, the U-phase waveform changes its output level from
“L” to “H” without waiting for completion of the one-shot pulse output
of the dead-time timer.
U-phase waveform is generated by repeating the operation above.
The way to generate U-phase waveform, which is the negative
phase of U-phase, is the same as that for U-phase waveform except
that the contents of output polarity set toggle flip-flop 2 is treated as
the reversed signal from the case of U-phase waveform.
In this way, U-phase waveform and U-phase waveform, having the
negative phase of U-phase, are output from the pins so that their “L”
levels do not overlap each other. The width of “L” level can be also
modified by changing the value of timers A2, A21, or A3.
V-, W-phase waveform and V-, W-phase waveform, having their
negative phase, are similarly output according to the corresponding
timer operation.
MITSUBISHI MICROCOMPUTERS
A
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M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
Timer A3 interrupt request
signal
Signal output each time
Timer A3 becomes 000016
One-shot pulse output with
timer A2
n1
n2
n3
n4
n5
n6
Timer A2
n1
n3
n5
n7
Timer A21
n2
n4
n6
n8
Contents of output polarity
set toggle flip-flop 2
Reversed pulse output
signal with dead-time timer
U-phase waveform output
U-phase waveform output
Fig. 46 U-phase waveform output example in three-phase mode 1 (triangular wave modulation)
Position-data-retain function
The three-phase waveform mode has the function to retain the input
data of the corresponding pin (IDU, IDV, IDW) at an edge of a positive waveform (U, V, or W phase). Whether to retain the data at a falling edge or rising one is selected by bit 3 of the position-data-retain
function control register (address AA16).
Retain data can be read out by bits 2 through 0 of the position-dataretain function control register (address AA16).
7
6
5
4
3
2
1
0
Position-data-retain function
control register
Address
AA16
W-phase position-data-retain bit (pin IDW)
V-phase position-data-retain bit (pin IDV)
U-phase position-data-retain bit (pin IDU)
Retain-trigger polarity select bit
0 : Falling edge of each phase s
positive waveform
1 : Rising edge of each phase s
positive waveform
Fig. 47 Bit configuration of position-data-retain function control register
43
MI
ELI
Y
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MITSUBISHI MICROCOMPUTERS
ge.
ion.
icat to chan
ecif
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a
in
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is is
: Th metric
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ic
Not e para
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PR
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
PULSE OUTPUT PORT MODE
Figure 48 shows the block diagram in the pulse output port mode.
This mode has a 6-bit pulse output port. The waveform output select
bits (bits 0 to 2) of waveform output mode register (address A616)
select use of pulse output port. The 6-bit pulse output port can also
be divided into 4 bits and 2 bits with the pulse output mode select bit
(bit 3) of waveform output mode register (address A616); each of
them can be individually controlled.
Set timers A3 and A0 to the timer mode because they are used in the
pulse output port mode. Figure 50 shows the bit configuration of
timer A3 and A0 mode registers in the pulse output port mode.
Timers A3 and A0 start count when setting the corresponding timer
count start bit to “1”, and they stop it when clearing that bit to “0”.
Each bit using timer A0 as a trigger can also be controlled by an input trigger from pin RTPTRG0. This control is selected by the pulse
output trigger select bits of the three-phase output data register 0
(bits 7 and 6 at address A816). Also, this externally-input trigger can
be selected from the following three types: falling edges, rising
edges, and falling and rising edges.
The reversed content of the pulse output data bit can be output to
each pulse output port by the pulse output polarity select bit of the
three-phase output data register 1 (bit 3 at address A916). When the
pulse output polarity select bit = “0”, the content of the pulse output
data bit is output as it is; when the pulse output polarity select bit =
“1”, the reversed content is output.
Pulse width modulation timer select bits
(bits 5, 4 at address A616)
Pulse width modulation
output of timer A1
Pulse output triggger select bits
(bits 7, 6 at address A816)
Pulse width modulation
output of timer A2
Pulse width modulation
output of timer A4
RTPTRG0
AAAAAAA
AAAAAAA
Pulse width
AAAAAAA
modulation
AAAAAAA
circuit
AAAAAAA
AAAAAAA
AAAAAAA
Timer A0
Pulse width modulation enable bits
0 through 2
(bits 0 through 2 at address A916)
AAAAAAAAAAAAAAAA
AAAAAAAAAAAAA
T
AAAAAAAAAAAAAAAA
AAAAAAAAAAAAA
AAAAAAAAAAAAAAAA
AAAAAAAAAAAAA b0b1 D Q
AAAAAAAAAAAAAAAA
AAAAAAAAAAAAA
D Q
AAAAAAAAAAAAAAAA
AAAAAAAAAAAAA
b2
D Q
AAAAAAAAAAAAAAAA
AAAAAAAAAAAAA
AAAAAAAAAAAAAAAA
AAAAAAAAAAAAA
Bits 0 through 3 of threeAAAAAAAAAAAAAAAA
AAAAAAAAAAAAA
phase output data register 0
AAAAAAAAAAAAAAAA
AAAAAAAAAAAAA
(address A8 )
T
b0
AAAAAAAAAAAAAAAA
AAAAAAAAAAAAA
D Q
AAAAAAAAAAAAAAAA
AAAAAAAAAAAAA b1 D Q
AAAAAAAAAAAAAAAA
AAAAAAAAAAAAA
AAAAAAAAAAAAAAAA
AAAAAAAAAAAAA
D Q
b2
AAAAAAAAAAAAAAAA
AAAAAAAAAAAAA
D Q
AAAAAAAAAAAAAAAA
AAAAAAAAAAAAA
b3
Pulse output mode
AAAAAAAAAAAAAAAA
AAAAAAAAAAAAA
select bit
AAAAAAAAAAAAAAAA
AAAAAAAAAAAAA
(bit 3 at address A6 )
AAAAAAAAAAAAAAAA
AAAAAAAAAAAAA
AAAAAAAAAAAAAAAA
AAAAAAAAAAAAA
AAAAAAAAAAAAAAAA
AAAAAAAAAAAAA
AAAAAAAAAAAAAAAA
AAAAAAAAAAAAA
AAAAAAAAAAAAAAAA
AAAAAAAAAAAAA
T
AAAAAAAAAAAAAAAA
AAAAAAAAAAAAA
b4
D Q
AAAAAAAAAAAAAAAA
AAAAAAAAAAAAA
D Q
b5
AAAAAAAAAAAAAAAA
AAAAAAAAAAAAA
AAAAAAAAAAAAAAAA
AAAAAAAAAAAAA
AAAAAAAAAAAAAAAA
AAAAAAAAAAAAA
Bits 4, 5 of three-phase output data register 0
(address A8 )
AAAAAAAAAAAAAAAA
AAAAAAAAAAAAA
or
AAAAAAAAAAAAAAAA
AAAAAAAAAAAAA
Bits 4, 5 of three-phase output data register 1
AAAAAAAAAAAAAAAA
AAAAAAAAAAAAA
(address A9 )
AAAAAAAAAAAAAAAA
AAAAAAAAAAAAA
AAAAAAAAAAAAAAAA
AAAAAAAAAAAAA
Timer A3
AAAAAAAAAAAAAAAA
AAAAAAAAAAAAA
Waveform output control bit 1
(bit 7 at address A616)
D Q
R
P6OUTCUT
Reset
Data bus (odd-numbered)
Data bus (even-numbered)
16
RTP01
RTP02
RTP03
16
16
16
Fig. 48 Block diagram in pulse output port mode
44
RTP00
RTP10
RTP11
Pulse output polarity
select bit
(bit 3 at address A916)
Waveform output
control bit 0
(bit 6 at address A616)
D Q
R
Reset
MITSUBISHI MICROCOMPUTERS
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7
6
5
4
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
3
2
1
0
Waveform output mode register
Address
A616
Waveform output select bits
000 : Parallel ports
001 : When pulse mode 0 is selected,
RTP0 is selected.
When pulse mode 1 is selected,
RTP0, RTP11, RTP10 are selected.
010 : When pulse mode 0 is selected,
RTP11, RTP10 are selected.
When pulse mode 1 is selected,
Do not select.
011 : When pulse mode 0 is selected,
RTP0, RTP11, RTP10 are selected.
When pulse mode 1 is selected,
Do not select.
Pulse output mode select bit
0 : Pulse mode 0
1 : Pulse mode 1
Pulse width modulation timer select bits
0 0 : When pulse mode 0 is selected (valid only for RTP0),
Pulse width modulation by timer A1
When pulse mode 1 is selected (valid only for RTP0, RTP11, RTP10),
Pulse width modulation by timer A1
0 1 : When pulse mode 0 is selected,
Do not set.
When pulse mode 1 is selected (valid only for RTP0, RTP11, RTP10),
Pulse width modulation by timer A1 ; RTP02, RTP01, RTP00
Pulse width modulation by timer A2 ; RTP03, RTP11, RTP10
1 0 : When pulse mode 0 is selected,
Do not set.
When pulse mode 1 is selected (valid only for RTP0, RTP11, RTP10),
Pulse width modulation by timer A1 ; RTP01, RTP00
Pulse width modulation by timer A2 ; RTP03, RTP02
Pulse width modulation by timer A4 ; RTP11, RTP10
1 1 : Do not select.
Waveform output control bit 0
When pulse mode 0 is selected,
0 : RTP11, RTP10 waveform outputs are disabled.
1 : RTP11, RTP10 waveform outputs are enabled.
When pulse mode 1 is selected,
Fix this bit to 0 .
Waveform output control bit 1
When pulse mode 0 is selected,
0 : RTP0 waveform output is disabled.
1 : RTP0 waveform output is enabled.
When pulse mode 1 is selected,
0 : RTP0, RTP11, RTP10 waveform outputs are disabled.
1 : RTP0, RTP11, RTP10 waveform outputs are enabled.
Fig. 49 Bit configuration of waveform output mode register in pulse output port mode
7
6
5
0
4
0
3
0
2
0
1
0
0
0
Timer A0 mode register
Timer A3 mode register
Address
5616
5916
Fix these bits to “000000” in pulse output
port mode.
Clock source select bits
(See Table 7.)
Fig. 50 Bit configuration of timer A3 and A0 mode registers in pulse
output port mode
45
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Not e para
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PR
7
6
5
4
3
2
1
MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
0
Three-phase output data register 0
16-BIT CMOS MICROCOMPUTER
Address
A816
RTP00 pulse output data bit
RTP01 pulse output data bit
RTP02 pulse output data bit
RTP03 pulse output data bit
RTP10 pulse output data bit;
Valid when pulse mode 1 is selected.
RTP11 pulse output data bit;
Valid when pulse mode 1 is selected.
Pulse output trigger select bits
0 0 : Underflow of timer A0
0 1 : Falling edge of input signal to pin
RTPTRG0
1 0 : Rising edge of input signal to pin
RTPTRG0
1 1 : Falling and rising edges of input
signal to pin RTPTRG0
7
×
6
×
5
4
3
2
1
0
Three-phase output data register 1
Address
A916
Pulse width modulation enable bit 0
0 : No pulse width modulation by timer A1
1 : Pulse width modulation by timer A1
Pulse width modulation enable bit 1
0 : No pulse width modulation by timer A2
1 : Pulse width modulation by timer A2
Pulse width modulation enable bit 2
0 : No pulse width modulation by timer A4
1 : Pulse width modulation by timer A4
Pulse output polarity select bit
0 : Positive
1 : Negative
RTP10 pulse output data bit;
Valid when pulse mode 0 is selected.
RTP11 pulse output data bit;
Valid when pulse mode 0 is selected.
Invalid in pulse output port mode.
Any of them may be “0” or “1”.
Fig. 51 Bit configuration of three-phase output data registers 1 and
0 in pulse output port mode
46
Pulse mode 0
This mode divides a pulse output port into 4 bits and 2 bits and individually controls them.
When setting the pulse output mode select bit to “0”, and setting bits
2 and 1 to “0” and bit 0 to “1” of the waveform output select bits, four
of RTP03, RTP02, RTP01, and RTP00 become the pulse output ports
with RTP0 selected.
When setting the pulse output mode select bit to “0”, and setting bits
2 and 0 to “0” and bit 1 to “1” of the waveform output select bits, two
of RTP11, RTP10 become the pulse output ports.
When setting the pulse output mode select bit to “0”, and setting bit 2
to “0” and bits 1 and 0 to “1” of the waveform output select bits, the
following two groups become the pulse output ports:
•Two of RTP11, RTP10
•Four of RTP03, RTP02, RTP01, RTP00.
Each time the contents of timer A3 counter become 000016, the contents of three-phase output data register 1 (address A916)’s bits 5
and 4, which corresponding to RTP11 and RTP10, are output from
ports.
Each time the contents of timer A0 counter become 000016, the contents of three-phase output data register 0 (address A816)’s low order 4 bits, which corresponding to RTP03, RTP02, RTP01, RTP00,
are output from ports.
When writing “0” to the specified one of the pulse output data bits, “L”
level is output from the pulse output port when the contents of the
corresponding timer counter become 000016; when writing “1” to it,
“H” level is output from the pulse output port.
In the case that an input trigger of pin RTPTRG0 is selected, the data
written to the pulse output data bit is output from the corresponding
pulse output port by this selected trigger.
Additionally, pulse width modulation can be applied for RTP03,
RTP02, RTP01, and RTP00. Because timer A1 is used for pulse
width modulation, actuate timer A1 in the pulse width modulation
mode. When any of pulse output data bits is “1”, the pulse to which
pulse width modulation has been applied is output from the pulse
output port when the contents of timer A0 counter become 000016.
The pulse width modulation using timer A1 can be applied by setting
the pulse width modulation enable bit 0 of the three-phase output
data register 1 (bit 0 at address A916) to “1” and the pulse width
modulation timer select bits of the waveform output mode register
(bits 5 and 4 at address A616) to “00”. Figure 52 shows example
waveforms in pulse mode 0.
In ports selecting pulse mode 0, output of RTP11 and RTP10 is controlled by the waveform output control bit 0 (bit 6) of waveform output mode register; output of RTP03, RTP02, RTP01 and RTP00 is
done by the waveform output control bit 1 (bit 7).
When setting the waveform output control bit to “1”, waveform is output from the corresponding port. When clearing that bit to “0”, waveform output from the corresponding port stops, and the port
becomes floating. The waveform output control bits are cleared to “0”
by reset or by executing instructions.
Also, the waveform output control bit 1 can be cleared to “0” by inputting a falling edge to pin P6OUTCUT.
MITSUBISHI MICROCOMPUTERS
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This etric li
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M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
Pulse mode 1
This mode controls a pulse output port as a 6-bit unit.
When setting the pulse output mode select bit to “1”, and setting bits
2 and 1 to “0” and bit 0 to “1” of the waveform output select bits, the
following become the pulse output ports:
•Six of RTP11, RTP10, RTP03, RTP02, RTP01, RTP00
Whether to control these pulse output ports by an underflow of timer
A0 or an input edge to pin RTPTRG0 is selected by the pulse output
trigger select bit of the three-phase output data register 0 (bits 7 and
6 at address A816).
Additionally, pulse width modulation can be applied to the pulse output ports. The pulse width modulation timer select bits of the waveform output mode register (bits 5 and 4 at address A616) select the
type of pulse width modulation from the following:
(1) When the pulse width modulation timer select bits = “00”, the
common modulation to six of RTP11, RTP10, RTP03, RTP02,
RTP01, RTP00 is selected. For this modulation, since timer A1 is
necessary, be sure to actuate this timer in the pulse width modulation mode.
(2) When the pulse width modulation timer select bits = “01”, the
modulation to the following two groups is selected; one consists
of RTP11, RTP10, RTP03, and the other consists of RTP02,
RTP01, RTP00. For this modulation, since timers A1 and A2 are
necessary, be sure to actuate these timers in the pulse width
modulation mode.
(3) When the pulse width modulation timer select bits = “10”, the
modulation to the following three groups is selected; one consists
of RTP11, RTP10, and another consists of RTP03, RTP02,
and the other consists of RTP01, RTP00. For this modulation,
since timers A1, A2, and A4 are necessary, be sure to actuate
these timers in the pulse width modulation mode.
Additionally, at this time, be sure to set the corresponding pulse
width modulation enable bit of the three-phase output data register 1
(bits 2 through 0 at address A916) to “1” in order to enable the pulse
width modulation.
The other operations are the same as that of pulse mode 0. Figure
53 shows example waveforms in pulse mode 1.
In ports selecting pulse mode 1, output can be controlled by the
waveform output control bit 1 of the waveform output mode register
(bit 7 at address A616).
When setting the waveform output control bit to “1”, waveform is output from the corresponding port. When clearing that bit to “0”, waveform output from the corresponding port stops and the port becomes
floating. The waveform output control bit 1 is cleared to “0” by reset,
by inputting a falling edge to pin P6OUTCUT, or by executing instructions.
47
MI
ELI
Y
NAR
MITSUBISHI MICROCOMPUTERS
ge.
ion.
icat to chan
ecif
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a
in
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es
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is is
: Th metric
e
ic
Not e para
Som
PR
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
Pulse output port example
Signal output each time
timer A0 becames 000016
RTP03
RTP02
RTP01
RTP00
Example of pulse width modulation for above pulse output port using timer A1
Signal output each time
timer A0 becames 000016
RTP03
RTP02
RTP01
RTP00
Pulse output port example in the case of pulse output polarity select bit = “1”
Signal output each time
timer A3 becames 000016
RTP11
RTP10
Fig. 52 Example waveforms in pulse mode 0
Pulse output port example
Signal output each time
timer A0 becames 000016
RTP11
RTP10
RTP03
RTP02
RTP01
RTP00
Example of pulse width modulation for above pulse output port using timer A1
Signal output each time
timer A0 becames 000016
RTP11
RTP10
RTP03
RTP02
RTP01
RTP00
Fig. 53 Example waveforms in pulse mode 1
48
MI
ELI
Y
NAR
MITSUBISHI MICROCOMPUTERS
.
ion. hange
icat
ecif ct to c
p
s
al
bje
a fin are su
not
s
is is ric limit
h
T
t
me
ice:
Not e para
Som
PR
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
SERIAL I/O PORTS
chronous (UART) serial I/O port which uses start and stop bits.
Figures 56 and 57 show the block diagrams of the receiver/transmitter.
Figure 58 shows the bit configuration of the UARTi transmit/receive
control register.
Each communication method is described below.
Two independent serial I/O ports are provided. Figure 54 shows a
block diagram of the serial I/O ports.
Bits 0 through 2 of the UARTi(i = 0, 1) transmit/receive mode register
shown in Figure 55 are used to determine whether to use port P1 as
a programmable I/O port, clock synchronous serial I/O port, or asyn-
Data bus (odd)
Data bus (even)
Bit converter
UARTi
D7 D6 D5 D4 D3 D2 D1 D0 receive buffer register
UART0 (Addresses 3716, 3616)
UART1 (Addresses 3F16, 3E16)
0 0 0 0 0 0 0 D8
UARTi receive register
RXDi
BRG count source select bits
f2
f16
BRGi
f64
1/(n + 1) divider
f512
1/16 divider
UART
Clock synchronous
1/16 divider
UART
Clock synchronous
Receive
control
circuit
Transmit
control
circuit
Transfer clock
Transfer clock
Clock synchronous
(Internal clock)
1/2 divider
UARTi transmit register
Clock synchronous
(External clock)
TXDi
Clock synchronous (when internal clock selected)
D8
D7 D6 D5 D4 D3 D2 D1 D0
UARTi
transmit buffer register
UART0 (Addresses 3316, 3216)
UART1 (Addresses 3B16, 3A16)
CLKi
CTSi/CLKi
CTSi
Bit converter
CTSi/RTSi
Data bus (odd)
n = a value set into the UARTi baud rate register (BRGi)
Data bus (even)
Fig. 54 Block diagram of serial I/O port
7 6 5 4 3 2 1 0
UART 0 Transmit/Receive mode register
UART 1 Transmit/Receive mode register
Addresses
3016
3816
Serial I/O mode select bits
0 0 0 : Serial I/O is invalid. (Port P1 functions as a programmable I/O port.)
0 0 1 : Clock synchronous
1 0 0 : 7-bit UART
1 0 1 : 8-bit UART
1 1 0 : 9-bit UART
Internal/External clock select bit
0 : Internal clock
1 : External clock
Stop bit length select bit (Valid in UART mode.)
0 : 1 stop bit
1 : 2 stop bits
Odd/Even parity select bit (Valid in UART mode with the parity enable bit = “1”.) (Note)
0 : Odd parity
1 : Even parity
Parity enable bit (Valid in UART mode) (Note)
0 : No parity
1 : With parity
Sleep select bit (Valid in UART mode) (Note)
0 : No sleep
1 : Sleep
Note: In the clock synchronous serial I/O mode, bits 4 to 6 are invalid. (Each of them may be “0” or “1”.) Furthermore, fix bit 7 to “0”.
Fig. 55 Bit configuration of UARTi transmit/receive mode register
49
MI
ELI
MITSUBISHI MICROCOMPUTERS
Y
NAR
ge.
ion.
icat to chan
ecif
l sp ubject
a
in
f
s
are
ot a
is n limits
his
e: T ametric
ic
t
No e par
Som
PR
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
Data bus (odd)
Data bus (even)
UARTi receive
buffer register
0
0
0
0
0
2SP
R XD i
PAR
D7
D6
D5
D4
D3
D2
D1
D0
8-bit UART
9-bit UART
Synchronous
UART
No
parity
1SP
D8
0
9-bit UART
Parity
SP
SP
0
7-bit UART
7-bit UART
8-bit UART
Synchronous
UARTi receive register
Synchronous
SP : Stop bit
PAR : Parity bit
Fig. 56 Block diagram of receiver
Data bus (odd)
Data bus (even)
UARTi receive transmit register
D8
2SP
SP
SP
Parity
Synchronous
0
50
D4
D3
D2
D1
D0
TXDi
8-bit UART
Fig. 57 Block diagram of transmitter
D5
UART
No
parity
SP : Stop bit
PAR : Parity bit
D6
8-bit UART
7-bit UART
9-bit UART
9-bit UART
Synchronous Synchronous
PAR
1SP
D7
7-bit UART
UARTi transmit register
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MITSUBISHI MICROCOMPUTERS
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Not e para
Som
PR
7
6
5
4
MSB
CPL
/LSB
3
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
2
TX
R/C
EPTY
1
0
CS1
CS0
UART0 transmit/receive control register 0
UART1 transmit/receive control register 0
Address
34 16
3C16
BRG count source select bits
0 0 : f2
0 1 : f16
1 0 : f64
1 1 : f512
CTS/RTS function select bit (Note 1)
0 : CTS function is selected.
1 : RTS function is selected.
Transmit register empty flag
0 : Data is present in the transmit register. (Transmission is in progress.)
1 : No data is present in the transmit register. (Transmission is completed.)
CTS/RTS enable bit
0 : CTS, RTS function is enabled.
1 : CTS, RTS function is disabled.
UARTi receive interrupt mode select bit
0 : Reception interrupt
1 : Reception error interrupt
CLK polarity select bit (This bit is used in the clock synchronous serial I/O mode.) (Note 2)
0 : At the falling edge of a transfer clock, transmit data is output;
at the rising edge, receive data is input.
When not in transfer, pin CLK’s level is “H”.
1 : At the rising edge of a transfer clock, transmit data is output;
at the falling edge, receive data is input.
When not in transfer, pin CLK’s level is “L”.
Transfer format select bit (This bit is used in the clock synchronous serial I/O mode.) (Note 2)
0 : LSB (Least Significant Bit) first
1 : MSB (Most Significant Bit) first
7
6
5
4
SUM PER FER OER
3
2
1
0
RI
RE
TI
TE
UART0 transmit/receive control register 1
UART1 transmit/receive control register 1
Address
3516
3D16
Transmit enable bit
Transmit buffer empty flag
Receive enable bit
Receive complete flag
Overrun error flag
Framing error flag (Note 3)
Parity error flag (Note 3)
Error sum flag (Note 3)
Notes 1: Valid when the CTS/RTS enable bit (bit 4) = “0”.
2: Fix these bits to “0” in UART mode or when serial I/O is invalid.
3: Valid in UART mode.
Fig. 58 Bit configuration of UARTi transmit/receive control register
51
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MITSUBISHI MICROCOMPUTERS
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No e par
Som
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M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
CLOCK SYNCHRONOUS SERIAL COMMUNICATION
A case where communication is performed between two clock synchronous serial I/O ports as shown in Figure 59 will be described.
(The transmission side will be denoted by subscript j and the receiving side will be denoted by subscript k.)
Bit 0 of the UARTj transmit/receive mode register and UARTk transmit/receive mode register must be set to “1” and bits 1 and 2 must be
“0”. The length of the transmission data is fixed at 8 bits.
Bit 3 of the UARTj transmit/receive mode register of the clock sending side is cleared to “0” to select the internal clock. Bit 3 of the
UARTk transmit/receive mode register of the clock receiving side is
set to “1” to select the external clock. Bits 4, 5 and 6 are ignored in
clock synchronous mode. Bit 7 must always be “0”.
The clock source is selected by bit 0 (CS0) and bit 1 (CS1) of the
clock-sending-side UARTj transmit/receive control register 0. As
shown in Figure 54, the selected clock is divided by (n + 1), then by
2, is passed through a transmission control circuit, and is output as
transmission clock CLKj. Therefore, when the selected clock is fi,
On the clock receiving side, the CS0 and CS1 bits of the UARTk
transmit/receive control register 0 are ignored because an external
clock is selected.
Both of UART0 and UART1 can use CTS and RTS functions.
Bit 4 of the UARTi transmit/receive control register 0 is used to determine whether to use CTS or RTS signal. Bit 4 must be “0” when
CTS or RTS signal is used. Bit 4 must be “1” when CTS and RTS signals are not used. When CTS and RTS signals are not used, CTS/
RTS pin can be used as a normal port pin.
When using pin CTS/RTS, :
• If bit 2 of the UARTi transmit/receive control register 0 is cleared to
“0”, CTS input is selected.
• If bit 2 is set to “1”, RTS output is selected.
The case using CTS and RTS signals are explained below. As
shown in Figure 66, bits 2 and 3 of the serial I/O pin control register
can determine whether port pins P13 and P17 are used as pins TxDi
or as port pins. When bits 2 and 3 are “0”, P13 and P17 function as
pins TxDi; when bits 2 and 3 are “1”, P13 and P17 function as port
pins. Therefore, in the input-only system where pins TxDi are not
used, pins TxDi can function as port pins.
Bit Rate = fi/ {(n + 1) × 2}
TxDj
TxDk
UARTj transmit register
UARTk transmit register
UARTj transmit buffer register
UARTk transmit buffer register
UARTj receive buffer register
UARTk receive buffer register
RxDj
RxDk
UARTj receive register
UARTk receive register
UARTj Transmit/Receive mode register
0
0
0
0
UARTk Transmit/Receive mode register
1
0
CLKj
RI
RE
TI
Fig. 59 Clock synchronous serial communication
52
0
1
UARTk Transmit/Receive control
register 0
MSB
TX
/LSB CPL
EPTY 1
CTSj
SUM PER FER OER
0
CLKk
UARTj Transmit/Receive control
register 0
TX
MSB
CS1 CS0
/LSB CPL
EPTY 0
UARTj Transmit/Receive control
register 1
1
RTSk
UARTk Transmit/Receive control
register 1
TE
SUM PER FER OER
RI
RE
TI
TE
MI
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MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
Transmission
Transmission is started when bit 0 (TEj flag: transmit enable bit) of
UARTj transmit/receive control register 1 is “1”, bit 1 (TIj flag) of one
is “0”, and CTSj input is “L”. The TIj flag indicates whether the transmit buffer register is empty or not. It is cleared to “0” when data is
written in the transmit buffer register; it is set to “1” when the contents
of the transmit buffer register is transferred to the transmit register
and the transmit buffer register becomes empty.
When all of the transmit conditions are satisfied, the transmit data in
the transmit buffer register are transferred to the transmit register,
and transmission starts. As shown in Figure 60, data is output from
TXDj pin each time when transmission clock CLKj changes from “H”
to “L”. (In the clock synchronous serial I/O mode, the polarity of a
transfer clock can be changed. For details, refer to the section on the
selection of the transfer clock polarity.) The data is output from the
least significant bit.
When the transmit register becomes empty after the contents has
been transmitted, data is transferred automatically from the transmit
buffer register to the transmit register if the next transmission start
condition is satisfied. The next transmission is performed
succeedingly. Once transmission has started, the TEj flag, TIj flag,
and CTSj signals are ignored until data transmission completes.
Therefore, transmission is not interrupted when CTSj input is
changed to “H” during transmission.
The transmission start condition indicated by TEj flag, TIj flag, and
CTSj is checked while the TENDj signal (shown in Figure 60) is “H”.
Therefore, data can be transmitted continuously if the next transmission data is written in the transmit buffer register and TIj flag is
cleared to “0” before theTENDj signal goes “H”.
Bit 3 (TXEPTYj flag) of UARTj transmit/receive control register 0
changes to “1” at the next cycle just after the TENDj signal goes “H”
and changes to “0” when transmission starts. Therefore, this flag can
be used to determine whether data transmission has completed.
When the TIj flag changes from “0” to “1”, the interrupt request bit in
the UARTj transmit interrupt control register is set to “1”.
16-BIT CMOS MICROCOMPUTER
next data reception becomes enabled. Bit 4 (OERk flag) of UARTk
transmit/receive control register 1 is set to “1” when the next data is
transferred from the receive register to the receive buffer register
while RIk flag is “1”, and indicates that the next data was transferred
to the receive register before the contents of the receive buffer register was read. (In other words, this indicates that an overrun error has
occurred.) RIk flag is automatically cleared to “0” when the low-order
byte of the receive buffer register is read or when the REk flag is
cleared to “0”. The OERk flag is cleared when the REk flag is
cleared. Bit 5 (FERk flag), bit 6 (PERk flag), and bit 7 (SUMk flag) are
ignored in clock synchronous mode.
As shown in Figure 54, with clock synchronous serial communication, data cannot be received unless the transmitter is operating because the receive clock is created from the transmission clock.
Therefore, the transmitter must be operating even when there is no
need to sent data from UARTk to UARTj.
Receive
When bit 2 of the UARTk transmit/receive control register 1 is set to
“1”, reception becomes enabled. In this case, when the CLKk signal
is input, the receive operation starts simultaneously with this signal.
The RTSk output is “H” when the REk flag is “0”. When the REk flag
is set to “1”, the RTSk output becomes “L”. This informs the transmitter side that reception becomes enabled. When the receive operation starts, the RTSk output automatically becomes “H”.
When the receive operation starts, the receiver takes data from pin
RxDk each time when the transmit clock (CLKj) turns from “L” to “H”.
Simultaneously with reception, the contents of the receiver register
is shifted bit by bit.
(Note that, in the clock synchronous serial communication, the polarity of a transfer clock can be inverted. For details, refer to the section
on the polarity of the transfer clock.) When an 8-bit data is received,
the contents of the receive register is transferred to the receive buffer
register and bit 3 (RIk flag) of UARTk transmit/receive control register 1 is set to “1”. In other words, the setting “1” to the RIk flag indicates that the receive buffer register contains the received data. At
this time, if the low-order byte of the UARTk receive buffer register is
read out, the RTSk output turns back to “L”. This indicates that the
53
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a
in
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ot a
is n limits
his
e: T ametric
ic
t
No e par
Som
PR
MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
1/fi × (n + 1) × 2
Transmission
clock
TEj
TIj
Write in transmit buffer register
Transmit register ←Transmit buffer register
CTSj
1/fi × (n + 1) × 2
Stopped because TEj = “0”
CLKj
TENDj
TXDj
D 0 D1 D2 D3 D4 D5 D6 D7
D0 D1 D2 D3 D4 D5 D6 D7
TXEPTYj
Fig. 60 Clock synchronous serial I/O timing
Interrupt request at completion of reception
When the RIk flag changes from “0” to “1”, in other words, when the
receive operation is completed, the interrupt request bit of the
UARTk receive interrupt control register can be set to “1”.
The timing when this interrupt request bit is to be set to “1” can be
selected from the following:
• Each reception
• When an error occurs at reception
If bit 5 of the UARTk transmit/receive control register 0 (UART receive interrupt mode select bit) is cleared to “0”, the interrupt request
bit is set to “1” at each reception. If bit 5 is set to “1”, the interrupt request bit is set to “1” only when an error occurs. (In the clock synchronous serial communication, only when an overrun error occurs,
the interrupt request bit is set to “1”.)
Polarity of transfer clock
In the clock synchronous serial communication, by bit 6 of the UARTj
transmit/receive control register 0 (CPL), the polarity of a transfer
clock can be selected.
As shown in Figure 61, when bit 6 = “0”, the polarity is as follows:
• In transmission, transmit data is output at the falling edge of CLKj.
• In reception, receive data is input at the rising edge of CLKk.
• When not in transfer, CLKi is at “H” level.
When bit 6 = “1”, the polarity is as follows:
• In transmission, transmit data is output at the rising edge of CLKj.
• In reception, receive data is input at the rising edge of CLKk.
• When not in transfer, CLKi is at “L” level.
54
D0 D 1 D2 D 3 D4 D5 D6 D7
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Not e para
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M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
■ CLK polarity select bit = 0
CLKi
TxDi
D0
D1
D2
D3
D4
D5
D6
D7
RxDi
D0
D1
D2
D3
D4
D5
D6
D7
❇ Transmit data is output to pin TxDi at the falling edge of transfer clock, and receive data is input from pin
RxDi at the rising edge of transfer clock.
When not in transfer, pin CLKi’s level is “H”.
■ CLK polarity select bit = 1
CLKi
TxDi
D0
D1
D2
D3
D4
D5
D6
D7
RxDi
D0
D1
D2
D3
D4
D5
D6
D7
❇ Transmit data is output to pin TxDi at the rising edge of transfer clock, and receive data is input from pin
RxDi at the falling edge of transfer clock.
When not in transfer, pin CLKi’s level is “L”.
Fig. 61 Polarity of transfer clock
55
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MITSUBISHI MICROCOMPUTERS
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ecif
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ic
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No e par
Som
PR
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
Selection of transfer format
In clock synchronous serial communication, transfer format can be
selected by bit 7 of the transmit/receive control register 0. When bit 7
is “0”, transfer format is LSB first. When bit 7 is “1”, transfer format is
MSB first.
This function is realized by changing connection relation between
Bit 7 in transmit/receive
control register 0
Write to transmit
buffer register
Data bus
0
(LSB first)
Read from receive
buffer register
Transmit buffer
register
Data bus
DB7
D7
DB7
D7
D6
DB6
D6
DB5
D5
DB5
D5
DB4
D4
DB4
D4
DB3
D3
DB3
D3
DB2
D2
DB2
D2
DB1
D1
DB1
D1
DB0
D0
DB0
D0
Transmit buffer
register
Data bus
Receive buffer
register
DB7
D7
DB7
D7
DB6
D6
DB6
D6
DB5
D5
DB5
D5
DB4
D4
DB4
D4
DB3
D3
DB3
D3
DB2
D2
DB2
D2
DB1
D1
DB1
D1
DB0
D0
DB0
D0
Fig. 62 Connection relation between transmit buffer register, receive buffer register, and data bus
Precautions for clock synchronous serial
communication
In the clock synchronous serial communication, the separate function for CTSi/RTSi cannot be selected. Furthermore, when an internal clock is selected, RTS output is undefined. Therefore, do not use
the RTS function.
Before transmit operation is performed, be sure to clear bits 2 and 3
of the serial I/O pin control register (address AC16) to “00”.
56
Receive buffer
register
DB6
Data bus
1
(MSB first)
the transmit buffer register and the receive buffer register when writing transmit data to the transmit buffer register or reading receive
data from the receive buffer register. Accordingly, the transmitter’s
operation is the same in both transfer formats.
Figure 62 shows the connection relation.
MI
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MITSUBISHI MICROCOMPUTERS
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Not e para
Som
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M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
ASYNCHRONOUS
SERIAL COMMUNICATION
Bit 4 is the stop bit length select bit to select 1 stop bit or 2 stop bits.
Bit 5 is a select bit of odd parity or even parity.
In the odd parity mode, the parity bit is adjusted so that the sum of 1s
in the data and parity bit is always odd.
In the even parity mode, the parity bit is adjusted so that the sum of
the 1s in the data and parity bit is always even.
Bit 6 is the parity bit select bit which indicates whether to add parity
bit or not.
Bits 4 to 6 must be set or reset according to the data format used in
the communicating devices.
Bit 7 is the sleep select bit. The sleep mode is described later.
Figure 66 shows the bit configuration of the serial I/O pin control register. By bits 0 and 1 of the serial I/O pin control register (CTSi/RTSi
separate select bits), the function of the CTS/RTS pin can be separated into two functions, and each function can be assigned to two
different pins. When bits 0 and 1 = “11”, the above separation is performed. When bits 0 and 1 = “00”, no separation is performed.
Table 8 lists the selection methods of the CTS/RTS function.
Asynchronous serial communication can be performed using 7-, 8-, or
9-bit length data. The operation is the same for all data lengths. The
following is the description for 8-bit asynchronous communication.
With 8-bit asynchronous communication, bit 0 of UARTi transmit/receive mode register is “1”, bit 1 is “0”, and bit 2 is “1”.
Bit 3 is used to select an internal clock or an external clock. If bit 3 is
“0”, an internal clock is selected and if bit 3 is “1”, then external clock
is selected. If an internal clock is selected, bit 0 (CS0) and bit 1 (CS1)
of UARTi transmit/receive control register 0 are used to select the
clock source. When an internal clock is selected for asynchronous
serial communication, the CLKi pin can be used as a normal I/O pin.
The selected internal or external clock is divided by (n + 1), then by
16, and is passed through a control circuit to create the UART transmission clock or UART receive clock.
Therefore, the transmission speed can be changed by changing the
contents (n) of the bit rate generator. If the selected clock is an internal clock Pfi or an external clock fEXT,
Bit Rate = (fi or fEXT) / {(n+1)×16}
(1/fi or 1/fEXT) × (n + 1) × 16
Transmission clock
TEi
TIi
Transmit register ← Transmit
buffer register
Written in transmit buffer register
CTSi
TENDi
Start bit
TXDi
Stopped because TEi = “0”
Parity bit Stop bit
ST D0 D1 D2 D3 D4 D5 D6 D7
P SP ST D0 D1 D2 D3 D4 D5 D6 D7
P SP
ST D0 D1
TXEPTYi
Fig. 63 Transmit timing example when 8-bit asynchronous communication with parity and 1 stop bit selected
(1/fi or 1/fEXT) × (n + 1) × 16
Transmission clock
TEi
TIi
Transmit register ← Transmit
buffer register
Written in transmit buffer register
TENDi
Start bit
TXDi
Stop bit
Stop bit
Stopped because TEi = “0”
ST D0 D1 D2 D3 D4 D5 D6 D7 D8 SP SP ST D0 D1 D2 D3 D4 D5 D6 D7 D8 SP SP
ST D0 D1 D2
TXEPTYi
Fig. 64 Transmit timing example when 9-bit asynchronous communication with no parity and 2 stop bits selected
57
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e: T ametric
ic
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No e par
Som
PR
MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
Transmission
Transmission is started when bit 0 (TEi flag transmit enable flag) of
UARTi transmit/receive control register 1 is “1”, bit 1 (TIi flag) is “0”,
and CTSi input (in other words, transmit enable signal input from receiver) is “L.” The TIi flag indicates whether the transmit buffer is
empty or not. It is cleared to “0” when data is written in the transmit
buffer; it is set to “1” when the contents of the transmit buffer register
is transferred to the transmit register.
When all of the transmission conditions are satisfied, transmit data
is transferred to the transmit register, and transmit operation starts.
As shown in Figures 63 and 64, data is output from the TXDi pin with
the stop bit or parity bit specified by bits 4 through 6 of UARTi transmit/receive mode register. The data is output from the least significant bit.
When the transmit register becomes empty after the contents has
been transmitted, data is transferred automatically from the transmit
buffer register to the transmit register if the next transmit start condition is satisfied. Then, the next transmission is performed
succeedingly.
Once transmission has started, the TEi flag, TIi flag, and CTSi signal
are ignored until data transmission is completed.
Therefore, transmission does not stop until it completes event if, during transmission, the TEi flag is cleared to “0” or CTSi input is set to
“1”.
The transmission start condition indicated by TEi flag, TIi flag, and
CTSi is checked while the TENDi signal shown in Figure 63 is “H”.
Therefore, data can be transmitted continuously if the next transmission data is written in the transmit buffer register and TIi flag is
cleared to “0” before the TENDi signal goes “H”.
Bit 3 (TXEPTYi flag) of UARTi transmit/receive control register 0
changes to “1” at the next cycle just after the TENDi signal goes “H”
and changes to “0” when transmission starts. Therefore, this flag can
be used to determine whether data transmission is completed.
When the TIi flag changes from “0” to “1”, the interrupt request bit of
the UARTi transmit interrupt control register is set to “1”.
fi or fEXT
REi
Stop bit
RXDi
Start bit
Check to be “L” level
Receive
clock
D1
D0
D7
Data fetched
Starting at the falling
edge of start bit
RIi
RTSi
Fig. 65 Receive timing example when 8-bit asynchronous communication with no parity and 1 stop bit selected
58
Start bit
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MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
Table 8. Selection methods of CTS/RTS function
CTS/RTS
enable bit
0
1
CTSi/RTSi
CTS/RTS
separate select bit function select bit
0
0
1
1
✕
✕
✕
Functions
Pin P10/CTS0/RTS0
Pin P11/CTS0/CLK0
Pin P14/CTS1/RTS1
CTS0
RTS0
RTS0
P10
P11 or CLK0
P11 or CLK0
CTS0 (Notes 1 and 2)
P11 or CLK0
CTS1
RTS1
RTS1
P14
Pin P15/CTS1/CLK1
P15 or CLK1
P15 or CLK1
CTS1 (Notes 1 and 2)
P15 or CLK1
✕: It may be “0” or “1”.
Notes 1: When using the CTS function, be sure to clear the corresponding bit of the port P1 direction register to “0”.
2: When CTSi and RTSi has been separated, the CLKi pin cannot be used. Therefore, in the clock synchronous serial communication, CTSi and RTSi
cannot be separated. Also, when CTSi and RTSi are separated in UART mode, be sure to select an internal clock.
Receive
7 6 5 4 3 2 1 0
Address
Serial I/O pin control register AC16
CTS0/RTS0 separate select bit
0 : CTS0/RTS0 are used together.
1 : CTS0/RTS0 are separated.
CTS1/RTS1 separate select bit
0 : CTS1/RTS1 are used together.
1 : CTS1/RTS1 are separated.
TxD0/P13 switch bit
0 : Functions as TxD0.
1 : Functions as P13.
TxD1/P17 switch bit
0 : Functions as TxD1.
1 : Functions as P17.
Fig. 66 Bit configuration of serial I/O pin control register
Receive is enabled when bit 2 (REi flag) of UARTi transmit/receive
control register 1 is set to “1.” As shown in Figure 65, the frequency
divider circuit (1/16) at the receiving side begin to work when a start
bit arrives and the data is received.
If RTSi output is selected by setting bit 2 of UARTi transmit/receive
control register 0 to “1”, the RTSi output is “H” when the REi flag is
“0”. When the REi flag changes to “1”, the RTSi output goes “L” to
inform the receiver that reception has become enabled. When the
receive operation starts, the RTSi output automatically becomes “H”.
The entire transmission data bits are received when the start bit
passes the final bit of the receive block shown in Figure 56. At this
point, the contents of the receive register is transferred to the receive
buffer register and bit 3 (Rli flag) of UARTi transmit/receive control
register 1 is set to “1.” In other words, the RIi flag indicates that the
receive buffer register contains data when it is set to “1.” At this time,
when the low-order byte of the UARTk receive buffer register is read
out, RTSi output goes back to “L” to indicate that the register is ready
to receive the next data.
Bit 4 (OERi flag) of UARTi transmit/receive control register 1 is set to
“1” when the next data is transferred from the receive register to the
receive buffer register while the RIi flag is “1”, in other words, when
an overrun error occurs. If the OERi flag is “1”, it indicates that the
next data has been transferred to the receive buffer register before
the contents of the receive buffer register has been read.
Bit 5 (FERi flag) is set to “1” when the number of stop bits is less than
required (framing error).
Bit 6 (PERi flag) is set to “1” when a parity error occurs.
Bit 7 (SUMi flag) is set to “1” when either the OERi flag, FERi flag, or
the PERi flag is set to “1.” Therefore, the SUMi flag can be used to
determine whether there is an error.
The setting of the RIi flag, OERi flag, FERi flag, and the PERi flag is
performed while transferring the contents of the receive register to
the receive buffer register.
59
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MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
The FERi, PERi, and SUMi flags are cleared to “0” when reading the
low-order byte of the receive buffer register or when writing “0” to the
REi flag.
The OERi flag is cleared to “0” when writing “0” to the REi flag.
Interrupt request at completion of reception
When the RIk flag changes from “0” to “1”, in other words, when the
receive operation is completed, the interrupt request bit of the
UARTk receive interrupt control register can be set to “1”.
The timing when this interrupt request bit is to be set to “1” can be
selected from the following:
• Each reception
• When an error occurs at reception
If bit 5 of the UARTk transmit/receive control register 0 (UART receive interrupt mode select bit) is cleared to “0”, the interrupt request
bit is set to “1” at each reception. If bit 5 is set to “1”, the interrupt
request bit is set to “1” only when an error occurs. (In the clock asynchronous serial communication, when an overrun error, framing error, or parity error occurs, the interrupt request bit is set to “1”.)
Sleep mode
The sleep mode is used to communicate only between certain microcomputers when multiple microcomputers are connected through
serial I/O.
The microcomputer enters the sleep mode when bit 7 of UARTi
transmit/receive mode register is set to “1.”
The operation of the sleep mode for an 8-bit asynchronous communication is described below.
When sleep mode is selected, the contents of the receive register is
not transferred to the receive buffer register if bit 7 (bit 6 if 7-bit asynchronous communication and bit 8 if 9-bit asynchronous communication) of the received data is “0”. Also the RIi, OERi, FERi, PERi,
and the SUMi flags are unchanged. Therefore, the interrupt request
bit of the UARTi receive interrupt control register is also unchanged.
Normal receive operation takes place when bit 7 of the received data
is “1”.
The following is an example of how the sleep mode can be used.
The main microcomputer first sends data: bit 7 is “1” and bits 0 to 6
are set to the address of the subordinate microcomputer to be communicated with. Then all subordinate microcomputers receive this
data. Each subordinate microcomputer checks the received data,
clears the sleep bit to “0” if bits 0 through 6 are its own address and
sets the sleep bit to “1” if not. Next, the main microcomputer sends
data with bit 7 cleared. Then the microcomputer which cleared the
sleep bit will receive the data, but the microcomputers which set the
sleep bit to “1” will not. In this way, the main microcomputer is able to
communicate only with the designated microcomputer.
Precautions for clock asynchronous (UART)
serial communication
When CTSi and RTSi are separated, pin CLKi cannot be used.
Therefore, when CTSi and RTSi are separated in UART mode, be
sure to select an internal clock.
Before transmit operation is performed, be sure to clear bits 2 and 3
of the serial I/O pin control register (address AC16) to “00”.
60
16-BIT CMOS MICROCOMPUTER
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M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
A-D CONVERTER
The A-D converter is a 10-bit successive approximation converter.
The use of A-D converter or the use of comparator can be selected
for each A-D input pin. The contents of the comparator function select register specify it.
Figure 67 shows a block diagram of the A-D converter.
Selection of A-D conversion frequency
(1,1)
f1
(1,0)
1/2
VREF connection select bit
VREF
AVSS
(0,1)
1/2
f2
φAD
(0,0)
A-D conversion frequency (φAD)
select bits 1, 0
0
Vref
Resistor ladder
network
1
Comparator function select register 0
A-D control register 1
A-D control register 0
Selector
1
Control circuit
Successive approximation
register
Selector
Comparator result register 0
A-D register 0
A-D register 1
Comparator
A-D register 2
A-D register 3
Decoder
A-D register 4
Data bus (odd)
Data bus (even)
AN0
AN1
AN2
AN3
AN4
Selector
Fig. 67 Block diagram of A-D converter
61
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MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
Figure 68 shows the bit configuration of comparator function select
register 0 (address DC16). Bits 7 to 0 correspond to channels 7 to 0
respectively. Each channel can be selected as either an A-D converter or a comparator. When the bit is “0”, the channel corresponding to it functions as a 10-bit or an 8-bit A-D converter. When the bit
is “1”, the channel functions as a comparator.
When selecting an A-D converter, an input voltage to a selected analog input pin is A-D converted and the result is stored into the A-D
register.
When selecting a comparator, D-A conversion is performed to the
value of which high-order 8 bits are the value stored in an even address of the A-D converter and of which low-order 2 bits are “102.”
Then, this D-A converted value is compared with the voltage supplied to an analog input pin. After the comparison, when the voltage
supplied to an analog input pin is higher, “1” is stored into the comparator result register 0 (address DE16) shown in Figure 69. When it
is lower, “0” is stored into that register.
Be sure to perform only read to the A-D register of which channel is
selected as an A-D converter, and perform only write to the A-D register of which channel is selected as a comparator. Additionally, do
not write to the comparator function select register 0 and the A-D register while an A-D converter or a comparator is operating.
Port direction register’s bits corresponding to pins to be A-D converted must be “0” (input mode) because analog input ports are multiplexed with port P7.
Figure 70 shows the bit configuration of the A-D control register 0
(address 1E16), and Figure 71 shows that of the A-D control register
1 (address 1F16).
The operation clock of the A-D converter, φAD, is selected by the following bits: bit 7 of the A-D control register 0 and bit 4 of the A-D control register 1.
When bit 4 of the A-D control register 1 = “0”, φAD is selected as follows:
• if bit 7 of the A-D control register 0 = “0”, φAD = f2/4.
• if bit 7 of the A-D control register 0 = “1”, φAD = f2/2.
When bit 4 of the A-D control register 1 = “1”, φAD is selected as follows:
• if bit 7 of the A-D control register 0 = “0”, φAD = f2.
• if bit 7 of the A-D control register 0 = “1”, φAD = f1.
Note that the highest frequency, φAD = f1, can be selected only in the
8-bit resolution mode.
φAD during A-D conversion must be 250 kHz or more because the
comparator uses a capacity coupling amplifier.
Bit 3 of A-D control register 1 is used to select whether to regard the
conversion result as 10-bit or as 8-bit data. The conversion result is
regarded as 10-bit data when bit 3 is “1” and as 8-bit data when bit 3
is “0”.
When the conversion result is used as 10-bit data, the low-order 8
bits of the conversion result is stored in the even address of the corresponding A-D register and the high-order 2 bits are stored in bits 0
and 1 at the odd address of the corresponding A-D register. Bits 2 to
7 of the A-D register odd address are “0000002” when read.
When the conversion result is used as 8-bit data, the high-order 8
bits of the 10-bit A-D conversion result are stored in even address of
the corresponding A-D register. In this case, the value at the A-D
register’s odd address is “0016” when read.
Whether to connect the reference voltage input (VREF) with the lad-
62
16-BIT CMOS MICROCOMPUTER
der network or not depends on bit 5 of the A-D control register 1. The
VREF pin is connected when bit 5 is “0” and is disconnected when bit
5 is “1” (High impedance state).
When A-D or D-A conversion is not performed, current from the VREF
pin to the ladder network can be cut off by disconnecting ladder network from the VREF pin.
Before starting A-D or D-A conversion, wait for 1 µs or more after
clearing bit 5 to “0”.
7
0
6
0
5
0
4
3
2
1
0
Comparator function select register 0
“0” : A-D converter is selected.
“1” : Comparator is selected.
Address
DC16
AN0 pin comparator function select bit
AN1 pin comparator function select bit
AN2 pin comparator function select bit
AN3 pin comparator function select bit
AN4 pin comparator function select bit
Fix these bits to “000”.
Fig. 68 Bit configuration of comparator function select register 0
7
6
5
4
3
2
1
0
Address
Comparator result register 0
DE16
“0” : ANi input level is lower than set digital value
“1” : ANi input level is higher than set digital value
AN0 pin comparator result bit
AN1 pin comparator result bit
AN2 pin comparator result bit
AN3 pin comparator result bit
AN4 pin comparator result bit
Note: Do not access with the ORAM(ORAMB) or ANDM(ANDMB) instruction.
Fig. 69 Bit configuration of comparator result register 0
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M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
Operation mode
The operation mode is selected by bits 3 and 4 of A-D control register 0 and bit 2 of A-D control register 1. The available operation
modes are one-shot, repeat, single sweep, and repeat sweep 0. Either an A-D converter or a comparator can be selected respectively
for every pin in the following 4 modes. The following description applies to the case where the bit of the comparator function select register 0 is “0” and an A-D converter is selected. It also applies to a
comparator’s operation except that an A-D conversion is changed to
a comparator operation and the result of a comparison is stored into
the comparator result register 0.
(1) One-shot mode
One-shot mode is selected when bits 3 and 4 of A-D control register
0 are “0”. The A-D conversion pins are selected with bits 0 to 2 of
A-D control register 0. A-D conversion or comparator operation is
started when bit 6 of A-D control register 0 (A-D conversion start bit)
7
6
5
0
4
3
2
1
0
A-D control register 0
is set to “1”.
When the ANi (i = 4 through 0) comparator function select bit (bits 4
through 0) of the comparator function select register 0 = “0” and bit 3
of the A-D control register 1 = “1”, A-D conversion ends 59 φAD cycles
after, and the interrupt request bit of the A-D conversion interrupt
control register is set to “1”. At the same time, bit 6 of the A-D control
register 0 (A-D conversion start bit) is cleared to “0” and this A-D conversion stops. The result of A-D conversion is stored into the A-D
register corresponding to the selected pin.
When the ANi (i = 4 through 0) comparator function select bit (bits 4
through 0) of the comparator function select register 0 = “1”, a comparator operation ends 14 φAD cycles after, and the interrupt request
bit of the A-D conversion interrupt control register is set to “1”. At the
same time, bit 6 of the A-D control register 0 (A-D conversion start
bit) is cleared to “0” and the comparator operation stops. The result
of the comparison is stored into the bits of the comparator result register corresponding to the selected pin.
Address
1E16
Analog input select bits (Note 1)
(Valid in the one-shot mode and repeat mode.)
0 0 0 : AN0
0 0 1 : AN1
0 1 0 : AN2
0 1 1 : AN3 (Note 2)
1 0 0 : AN4 (Note 3)
1 0 1 : Do not select.
1 1 0 : Do not select.
1 1 1 : Do not select.
A-D operation mode select bit 0
0 0 : One-shot mode
0 1 : Repeat mode
1 0 : Single sweep mode
1 1 : Repeat sweep mode 0
Fix this bit to “0”.
A-D conversion start bit (Note 4)
0 : A-D conversion stopped.
1 : A-D conversion started.
A-D conversion frequency (φAD) select bit 0
Notes 1: Invalid in the single sweep mode and repeat sweep mode 0. (Each of these bits may be “0” or “1”.)
2: When using pin AN3, make sure that the D-A0 output enable bit (bit 0 at address 9616) = “0” (output disabled).
3: When using pin AN4, make sure that the D-A1 output enable bit (bit 1 at address 9616) = “0” (output disabled).
4: Use the MOVM (MOVMB) or STA (STAB or STAD) instruction for rewriting to this bit.
5: Rewriting to each bit of the A-D control register 0 (except for bit 6) must be performed while A-D conversion is stopped.
Fig. 70 Bit configuration of A-D control register 0
63
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7
6
5
0
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
4
16-BIT CMOS MICROCOMPUTER
3
2
0
1
0
A-D control register 1
Address
1F16
A-D sweep pin select bits (Note 1)
(Valid in the single sweep mode and repeat sweep mode.)
0 0 : AN0, AN1 (2 pins)
0 1 : AN0–AN3 (4 pins) (Note 2)
1 0 : AN0–AN4 (5 pins) (Notes 2, 3)
1 1 : Do not select.
Fix this bit to “0”.
Resolution select bit
0: 8-bit resolution mode
1: 10-bit resolution mode
A-D conversion frequency (φAD) select bit 1
Fix this bit to “0”.
VREF connection select bit (Note 4)
0 : VREF is connected.
1 : VREF is not connected.
“0” at read.
A-D conversion frequency (φAD) select bit
Bit 1
Bit 0
0
0
1
0
0
1
1
1
φAD
f2/4
f2/2
f2
f1 (Selectable only in 8-bit resolution mode)
Notes 1: Invalid in the one-shot mode and repeat mode. (Each of these bits may be “0” or “1”.)
2: When using pin AN3, make sure that the D-A0 output enable bit (bit 0 at address 9616) = “0” (output disabled).
3: When using pin AN4, make sure that the D-A1 output enable bit (bit 1 at address 9616) = “0” (output disabled).
4: Once this bit is cleared from “1” to “0”, it is necessary to wait for 1 µs or more before the A-D conversion starts.
5: Rewriting to each bit of the A-D control register 1 must be performed while A-D conversion is stopped.
Fig. 71 Bit configuration of A-D control register 1
64
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MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
(2) Repeat mode
Repeat mode is selected when bit 3 of the A-D control register 0 =
“1” and bit 4 = “0”.
The operation of this mode is the same as the operation of one-shot
mode except that when A-D conversion for the selected pin is complete and the result is stored in the A-D register, conversion does not
stop, but is repeated.
No interrupt request is generated in this mode. Furthermore, the A-D
conversion start bit is not cleared.
The contents of the A-D register can be read at any time.
Be sure not to write to the A-D register corresponding to the pins selected for a comparator during operation.
(3) Single sweep mode
Single sweep mode is selected when bit 3 of the A-D control register
0 = “0” and bit 4 = “1”.
In the single sweep mode, the number of analog input pins to be
swept can be selected. Analog input pins are selected by bits 1 and
0 of the A-D control register 1 (address 1F16). Two pins, four pins, or
five pins can be selected as analog input pins, depending on the
contents of these bits.
A-D conversion is performed only for selected input pins. After A-D
conversion is performed for input of AN0 pin, the conversion result is
stored in A-D register 0, and in the same way, A-D conversion is performed for selected pins one after another. After A-D conversion is
performed for all selected pins, the sweep is stopped.
A-D conversion is started when bit 6 of the A-D control register 0
(A-D conversion start bit) is set to “1”. When A-D conversion for all
selected pins end, the interrupt request bit of the A-D conversion interrupt control register is set to “1”. At the same time, A-D conversion
start bit is cleared to “0” and A-D conversion stops.
(4) Repeat sweep mode 0
Repeat sweep mode 0 is selected when bit 3 of the A-D control register 0 = “1” and bit 4 = “1”.
The difference from the single sweep mode is that A-D conversion
does not stop after conversion for all selected pins, but repeats again
from the AN0 pin. The repeat is performed among the selected pins.
Also, no interrupt request is generated. Furthermore, the A-D
convension start bit is not cleared. The A-D register can be read at
any time.
Be sure not to write to the A-D register corresponding to the pins selected for a comparator during operation.
Precaution for A-D conversion interrupts
Clear the interrupt request bit of the A-D conversion interrupt control
register (bit 3 at address 7016) before using an A-D conversion interrupt. It is because this interrupt request bit is undefined just after reset.
65
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MITSUBISHI MICROCOMPUTERS
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M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
D-A CONVERTER
7 6 5 4 3 2 1 0
Two independent D-A converters are included in this microcomputer,
and each D-A converter adopts an 8-bit R-2R method. Figure 72
shows the block diagram of the D-A converter, and Figure 73 shows
the bit configuration of the D-A control register (address 9616).
D-A conversion is performed by writing a value to the corresponding
D-A register i. Whether to output the analog voltage or not is determined by bits 0 and 1 of the D-A control register. When any of bits 0
and 1 = “1”, the corresponding pin (D-A0 or D-A1) outputs the analog
voltage.
This analog voltage (V) is determined according to value n. (“n” =
decimal number. This has been set in the D-A register.)
D-A control register
D-A0 output enable bit (Note)
0: Output is disabled.
1: Output is enabled.
D-A1 output enable bit (Note)
0: Output is disabled.
1: Output is enabled.
Note: Pin D-Ai is multiplexed with I/O port pins, analog input pins, and
external interrupt input pins. When a D-Ai output enable bit = “1”
(in other words, output is enabled.), however, the corresponding
pin cannot function as another I/O pin, which is multiplexed with
pin D-Ai.
V = VREF ✕ n/256 (n = 0 to 255)
VREF : Reference voltage
Fig. 73 Bit configuration of D-A control register
The contents of the corresponding D-A output enable bit and D-A
register are cleared to “0” at reset.
An external buffer is necessary when connecting a low impedance
load with the D-A converter. It is because that a D-A output pin
doesn’t include a buffer.
Pin D-Ai (i = 0, 1) is multiplexed with I/O port pins, analog input pins,
and external interrupt input pins. When a D-Ai output enable bit = “1”
(in other words, output is enabled.), however, the corresponding pin
cannot function as another I/O pin, which is multiplexed with pin DAi.
Also, when not using the D-A converter, be sure to clear the contents
of the corresponding D-A output enable bit and D-A register to “0”.
Data bus
D-A register i (i = 0, 1)
(Addresses 9816, 9916)
VREF
AVSS
R-2R ladder
resistor network
D-Ai output enable bit
Pin D-Ai
Fig. 72 Block diagram of D-A converter
66
Address
9616
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MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
WATCHDOG TIMER
comes “0” and an interrupt is generated.
The microcomputer can generate a reset pulse by writing “1” to bit 6
(software reset bit) of processor mode register 0 in an interrupt routine and can be restarted.
The watchdog timer can also be used to return from the STP state,
where a clock has stopped its operation owing to the STP instruction
execution. For details, refer to the sections on the clock generating
circuit and standby function.
The watchdog timer stops its operation in the following cases, and at
this time, input to the watchdog timer is disabled:
• When the external area is accessed in the hold state
• In the wait mode
• In the stop mode
The watchdog timer is used to detect unexpected execution sequence caused by software runaway and others. Figure 74 shows
the block diagram of the watchdog timer.
The watchdog timer consists of a 12-bit binary counter.
The watchdog timer counts clock Wf32, which is obtained by dividing
the peripheral devices’ clock f2 by 16; or clock Wf512, which is obtained by doing it by 256. Bit 0 of the watchdog timer frequency select register (watchdog timer frequency select bit) shown in Figure 75
selects which clock is to be counted.
Wf512 is selected when this bit 0 is “0”, and Wf32 is selected when bit
0 is “1”. Bit 0 is cleared to “0” after reset.
FFF16 is set in the watchdog timer when “L” level voltage is applied
to pin RESET, STP instruction is executed, data is written to the
watchdog timer register (address 6016), or the most significant bit of
the watchdog timer becomes “0”.
After FFF16 is set in the watchdog timer, when the watchdog timer
counts Wf32 or Wf512 by 2048 counts, the most significant bit of
watchdog timer becomes “0”, the watchdog timer interrupt request
bit is set to “1”, and FFF16 is set again in the watchdog timer.
In program coding, make sure that data is written in the watchdog
timer before the most significant bit of the watchdog timer becomes
“0”. If this routine is not executed owing to unexpected program execution or others, the most significant bit of the watchdog timer be-
f2
Wait mode
7
1/16
4
3
2
1
0
Watchdog timer clock source select bits at STP
state termination
0 0 : fX32
0 1 : fX16
1 0 : fX128
1 1 : fX64
Fig. 75 Bit configuration of watchdog timer frequency select register
Watchdog timer
frequency select bit
Watchdog timer
interrupt request
Watchdog timer
0
fX16
fX32
fX64
fX128
Address
6116
Watchdog timer frequency select bit
0 : W f512
1 : W f32
Wf512
Divided f(XIN)
5
Watchdog timer frequency select register
Wf32 1
1/16
6
❈
Stop mode
“FFF16” is set.
Disables watchdog
timer (Note).
Watchdog timer clock source select
bits at STP state termination
Writing to watchdog
timer register
RESET
STP instruction
• Watchdog timer register: address 6016
• Watchdog timer frequency select register: bit 0 at address 6116
• Watchdog timer clock source select bits at STP state termination: bits 6, 7 at address 6116
❈ When the most significant bit of the watchdog timer becomes “0”, this signal will be generated.
Note: During the stop mode and until the stop mode is terminated, setting for disabling the
watchdog timer is ignored.
Fig. 74 Block diagram of watchdog timer
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MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
How to disable watchdog timer
When not using the watchdog timer, it can be disabled. When the
watchdog timer is disabled, it’s operation stops and no watchdog
timer interrupt has been generated.
Setting for disabling the watchdog timer is possible by writing “7916”
and “5016” to the particular function select register 2 (address 6416)
sequentially with the following instructions:
• MOVMB/STAB instruction, or
• MOVM/STA instruction (m = 1)
If any method other than above has been adopted in order to access
(in other words, read/write) the particular function select register 2,
the watchdog timer will not be disabled until reset operation is performed. (Also, reset is the only one method to remove the setting for
disabling the watchdog timer.)
Moreover, this setting for disabling the watchdog timer is ignored at
return from the STP mode, and the watchdog timer operates. (For
details, refer to the section on the standby function.)
68
16-BIT CMOS MICROCOMPUTER
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MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
INPUT/OUTPUT PINS
Ports P1, P2, and P5 through P7 all have the direction register, and
each bit can be programmed for input or output. A pin becomes an
output pin when the corresponding bit of direction register is “1”, and
an input pin when it is “0”.
Also, each bit of the port P6 direction register can be cleared to “0”
by inputting a falling edge to pin P6OUTCUT or by executing instructions.
When a pin is programmed for output, the data is written to its port
latch and it is output to the output pin. When a pin is programmed for
output, the contents of the port latch is read instead of the value of
the pin. Accordingly, a previously output value can be read correctly
even when the output “H” voltage is lowered or the output “L” voltage
is raised owing to an external load, etc.
A pin programmed as an input pin is in the flooting state, and the
value input to the pin can be read. When a pin is programmed as an
input pin, the data is written only in the port latch and the pin remains
floating.
Each of Figures 76 and 77 shows the block diagram for each port
pin.
When using a port pin as an internal peripheral device’s input pin,
clear the corresponding port direction register’s bit to “0”. When using a port pin as an internal peripheral device’s output pin, the port
direction register’s bit may be “0” or “1”.
69
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MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
Direction register
P12/RXD0, P16/RXD1,
P21/TA4IN, P23 /TA9IN,
P24(/TB0IN), P25 (/TB1IN),
P26(/TB2IN), P27 (/INT3/RTPTRG0),
P55/INT5/TB0IN/IDW,
P56/INT6/TB1IN/IDV,
P57/INT7/TB2IN/IDU
Data bus
[Inside dotted-line not included]
P13/TXD0, P17/TXD1
Port latch
Direction register
1
Output(Internal peripheral devices)
[Inside dotted-line included]
P20/TA4OUT, P2 2/TA9OUT
Data bus
Port latch
Direction register
R
P60/TA0OUT/W/RTP00,
P61/TA0IN/V/RTP01,
P62/TA1OUT/U/RTP02,
P63/TA1IN/W/RTP03,
P64/TA2OUT/V/RTP10,
P65/TA2IN/U/RTP11
P6OUTCUT
1
Reset
Output(Internal peripheral devices)
Data bus
Port latch
Direction register
P70/AN0, P71/AN1,
P72/AN2
Data bus
Port latch
Analog input
Fig. 76 Block diagram for each port pin (1)
70
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PR
MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
1
0
P10/CTS0/RTS0,
P11/CTS0/CLK0,
P14/CTS1/RTS1,
P15/CTS1/CLK1,
Direction register
Output (Internal peripheral devices)
Data bus
[Inside dotted-line not included]
P73/AN3/DA0
[Inside dotted-line included]
P74/AN4/DA1/INT3/RTPTRG0
Port latch
Direction register
Data bus
Port latch
Analog input
Analog output
Enable D-A output
INT4
Fig. 77 Block diagram for each port pin (2)
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MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
RESET CIRCUIT
While the power source voltage satisfies the recommended operating condition, reset state is removed if pin RESET’s level returns
from the stabilized “L” level to the “H” level. As a result, program execution starts from the reset vector address. This reset vector address is expressed as shown below:
• A23 to A16 = 0016
• A15 to A8 = Contents at address FFFF16
• A7 to A0 = Contents at address FFFE16
Figures 78 and 79 show the microcomputer internal register’s status
at reset, and Figure 80 shows an operation example of the reset circuit. Apply “L” level voltage to pin RESET for a period (10 µs or more)
under the following conditions:
• Pin Vcc’s level satisfies the recommended operating condition.
• Oscillator’s operation has been stabilized.
VCC level
VCC
0V
RESET
0.2VCC level
10 µs
0V
XIN
0V
Power on
Oscillation stabilized
Fig. 80 Operation example of reset circuit (Note that proper evaluation is necessary in the system development stage.)
Address
Address
(A616)···
0016
Timer A5 interrupt control register
(F516)···
0 0 0 0
Three-phase output data register 0 (A816)···
0016
Timer A6 interrupt control register
(F616)···
0 0 0 0
Three-phase output data register 1 (A916)···
0016
Timer A7 interrupt control register
(F716)···
0 0 0 0
Waveform output mode register
Position-data-retain function control register (AA16)···
0 0 0 0
Timer A8 interrupt control register
(F816)···
0 0 0 0
(AC16)···
0 0 0 0
Timer A9 interrupt control register
(F916)···
0 0 0 0
Port P2 pin function control register (AE16)···
0 0 0 0
INT5 interrupt control register
(FD16)···
0 0 0 0 0 0
Clock control register 0
(BC16)··· 0 0 0 1 0 1 1 1
INT6 interrupt control register
(FE16)···
0 0 0 0 0 0
Up-down register 1
(C416)···
0016
INT7 interrupt control register
(FF16)···
0 0 0 0 0 0
Timer A5 mode register
(D616)···
0016
Processor status register PS
0 0 0 ? ? 0 0 0 1 ? ?
Timer A6 mode register
(D716)···
0016
Program bank register PG
Timer A7 mode register
(D816)···
0016
Program counter PCH
Contents at address FFFF16
Timer A8 mode register
(D916)···
0016
Program counter PCL
Contents at address FFFE16
Timer A9 mode register
(DA16)···
0016
Direct page registers DPR0 to DPR3
Comparator function select register 0 (DC16)···
0016
Data bank register DT
(DE16)···
0016
Stack pointer
Serial I/O pin control register
Comparator result register 0
0016
000016
0016
FFF16
Note: The contents of the other registers and RAM are undefined at reset and must be initialized by software.
Fig. 79 Microcomputer internal register’s status at reset (2)
72
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PR
MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
Address
Address
Port P1 direction register
(0516)···
0016
Processor mode register 0
(5E16)··· 0 0 0 0 1 0 0 0
Port P2 direction register
(0816)···
0016
Processor mode register 1
(5F16)··· 0 0 0 0 0 0 0 1
Port P5 direction register
(0D16)··· 0 0 0
Watchdog timer
Port P6 direction register
(1016)···
0 0 0 0 0 0
Watchdog timer frequency select register
(6116)··· 0 0
Port P7 direction register
(1116)···
0 0 0 0 0
Particular function select register 0
(6216)··· 0
A-D control register 0
(1E16)··· 0 0 0 0 0 ? ? ?
Particular function select register 1
(6316)···
A-D control register 1
(1F16)···
Debug control register 0
(6616)··· 1
UART 0 transmit/receive mode register
(3016)···
0016
Debug control register 1
(6716)··· 0 0 0
UART 1 transmit/receive mode register
(3816)···
0016
INT3 interrupt control register
(6E16)···
0 0 0 0 0
UART 0 transmit/receive control register 0
(3416)··· 0 0 0 0 1 0 0 0
INT4 interrupt control register
(6F16)···
0 0 0 0 0
UART 1 transmit/receive control register 0
(3C16)··· 0 0 0 0 1 0 0 0
A-D conversion interrupt control register
(7016)···
? 0 0 0
UART 0 transmit/receive control register 1
(3516)··· 0 0 0 0 0 0 1 0
UART 0 transmit interrupt control register
(7116)···
0 0 0 0
UART 1 transmit/receive control register 1
(3D16)··· 0 0 0 0 0 0 1 0
UART 0 receive interrupt control register
(7216)···
0 0 0 0
Count start register 0
(4016)···
0016
UART 1 transmit interrupt control register
(7316)···
0 0 0 0
Count start register 1
(4116)···
0 0 0 0 0
UART 1 receive interrupt control register
(7416)···
0 0 0 0
One-shot start register 0
(4216)··· 0
0 0 0 0 0
Timer A0 interrupt control register
(7516)···
0 0 0 0
One-shot start register 1
(4316)··· 0
0 0 0 0 0
Timer A1 interrupt control register
(7616)···
0 0 0 0
Up-down register 0
(4416)···
0016
Timer A2 interrupt control register
(7716)···
0 0 0 0
Timer A clock frequency select register
(4516)···
Timer A3 interrupt control register
(7816)···
0 0 0 0
Timer A0 mode register
(5616)···
0016
Timer A4 interrupt control register
(7916)···
0 0 0 0
Timer A1 mode register
(5716)···
0016
Timer B0 interrupt control register
(7A16)···
0 0 0 0
Timer A2 mode register
(5816)···
0016
Timer B1 interrupt control register
(7B16)···
0 0 0 0
Timer A3 mode register
(5916)···
0016
Timer B2 interrupt control register
(7C16)···
0 0 0 0
Timer A4 mode register
(5A16)···
0016
D-A control register
(9616)···
0 0
Timer B0 mode register
(5B16)··· 0 0 ? 0 0 0 0 0
D-A register 0
(9816)···
0016
Timer B1 mode register
(5C16)··· 0 0 ? 0 0 0 0 0
D-A register 1
(9916)···
0016
Timer B2 mode register
(5D16)··· 0 0 ? 0 0 0 0 0
0 0 0 0 0 ? ?
0 0
(6016)···
FFF16
0
0
0
0 0
0 0 0
(Note 2)
(Note 2)
0 0 0
(Note 2)
Notes 1: The contents of the other registers and RAM are undefined at reset and must be initialized by software.
2: At power-on reset, these bits are clear to “0”. At hardware or software reset, on the other hand, these bits retain the value just before reset.
Fig. 78 Microcomputer internal register’s status at reset (1)
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MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
OSCILLATION CIRCUIT
An oscillation circuit locates between pins XIN and XOUT, and Figure
81 shows a circuit example with an external ceramic resonator or
quartz-crystal oscillator. The constants such as capacitance etc. depend on an oscillator. Therefore, for these constants, adopt the resonator/oscillator manufacturer’s recommended values.
Figure 82 shows a circuit example with an external clock source.
When an external clock is input, be sure to leave pin XOUT open.
Also, in this case, when the external clock input select bit (bit 1 of the
particular function select register 0; See Figure 86.) is set to “1”, the
oscillation circuit stops it’s operation and resumes the current dissipation. Moreover, this bit has another function, which selects the return condition from the stop mode. For details, refer to the section on
the standby function.
On the other hand, the PLL (Phase Locked Loop) frequency multiplier (hereafter, referred as PLL circuit.) is included, also. This PLL
circuit uses a clock input from pin XIN and generates a multiplied
clock. When using the PLL circuit, be sure to connect pin VCONT with
an external filter circuit. (See Figure 83.) When not using the PLL circuit, be sure to leave pin VCONT open.
When not using the PLL circuit, be sure to clear the PLL circuit operation enable bit (bit 1 of the clock control register 0; See Figure
85.), so that the PLL circuit will stop its operation.
M37906
XIN
XOUT
Rf
Rd
COUT
CIN
Fig. 81 Circuit example with external ceramic resonator or quartz-crystal
oscillator
M37906
XIN
XOUT
Left open.
External clock source
Vcc
Vss
Fig. 82 Circuit example with external clock source
M37906
VCONT
1 KΩ
220 pF
0.1 µF
Note: Make the wiring length as short as possible,
and shield it with the GND line which
surrounds this circuit. Also, for the clock
supply to pin XIN, see Figures 81 and 82.
Fig. 83 Circuit example of connection with pin VCONT when PLL circuit used
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MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
CLOCK GENERATING CIRCUIT
Figure 84 shows the block diagram of the clock generating circuit.
The clock generating circuit consists of the clock oscillation circuit,
PLL frequency multiplier (PLL circuit), system clock switch circuit, peripheral devices’ clock switch circuit, clock divider, standby control
circuit, etc. As control registers for the clock generating circuit, also,
the clock control register 0 (address BC16), particular function select
register 0 (address 6216) are provided. (See Figures 85 and 86.)
As shown in Figure 84, clocks used in the CPU, BIU, peripheral devices, watchdog timer (in other words, clocks φCPU, φBIU, f1 to f4096,
Wf32, Wf512) are made from system clock fsys. System clock fsys can
be selected between fXIN (in other words, a clock input from pin XIN)
and fPLL (in other words, an output clock generated by the PLL circuit).
The PLL circuit’s operation, system clock (fsys) selection, and divide
ratio selection for peripheral devices’ clocks (f1 to f4096) are controlled by the clock control register. The following describes about
these control.
Bit 1 of the clock control register 0 (the PLL circuit operation enable
bit) selects the PLL circuit’s operation (inactive/active). When this bit
is set to “1”, pin VCONT will becomes valid, and the PLL circuit will operate. At reset, the PLL circuit operation enable bit becomes “1”. (In
this case, the PLL circuit operates is active.) When not using the PLL
circuit, be sure to clear the PLL circuit operation enable bit to “0”
(stopped). At the STP instruction execution, the PLL circuit is active,
and pin VCONT is invalid, regardless of this bit 1’s status.
Bits 2 and 3 of the clock control register 0 (the PLL multiplication ratio select bits) select the ratio of fPLL/fXIN. The PLL multiplication ra-
tio must be set so that the frequency of fPLL must be in the range
from 10 MHz to 20 MHz. At reset, the PLL multiplication ratio select
bits become “0,1” (✕ 2). The change of the multiplication ratio must
be performed while input clock fXIN is set as system clock. (In this
case, bit 5 of the clock control register 0 = “0”.) After that, be sure to
wait that the operation-stabilizing time of the PLL circuit has passed,
and switch the system clock to fPLL. (In other words, set bit 5 to “1”.)
Note that, after reset, the PLL multiplication ratio select bits are allowed to be changed only once.
Bit 5 of the clock control register 0 is the system clock select bit, and
input clock fXIN is selected as the system clock when bit 5 = “0”. On
the other hand, when bit 5 = “1”, fPLL is selected. At reset, the system
clock select bit becomes “0”. When selecting fPLL, be sure that the
PLL circuit’s operation has been stabilized properly, and then, set the
system clock select bit to “1”. Also, when the PLL circuit operation
enable bit is cleared to “0” (the PLL circuit is stopped.), the system
clock select bit will automatically be cleared to “0”. Note that a value
of “1” cannot be written to the system clock select bit while the PLL
circuit operation enable bit =“0”.
Table 9 lists the fsys selection.
Bits 6 and 7 of the clock control register 0 are the peripheral devices’
clock select bits 0, 1, and these bits select the division ratio of (f1 to
f4096)/(fsys).
Table 10 lists the internal peripheral devices’ operation clock frequency. At reset, these bits become “0, 0”.
Table 9. fsys selection
System clock select bit PLL circuit operation enable bit PLL multiplication ratio select bits
(Bit 5)
(Bits 3, 2) (Note)
(Bit 1)
0
01 (✕ 2)
1
1
10 (✕ 3)
11 (✕ 4)
System clock fsys
Clock source
Frequency (Note)
f(XIN)
f(XIN) ✕ 2
f(XIN) ✕ 3
f(XIN) ✕ 4
fXIN
fPLL
fPLL
fPLL
Note: The PLL multiplication ratio must be set so that the frequency of fPLL must be in the range from 10 MHz to 20 MHz.
f(XIN) means the frequency of the input clock from pin XIN (fXIN). After reset, the PLL multiplication ratio select bits are allowed to be
changed only once.
Table 10. Internal peripheral devices’ operation clock frequency
Internal peripheral devices’
operation clock
f1
f2
f16
f64
f512
f4096
Peripheral devices’ clock select bits 1, 0 (bits 7, 6)
00
fsys
fsys/2
fsys/16
fsys/64
fsys/512
fsys/4096
0 1 (Note)
fsys
fsys
fsys/8
fsys/32
fsys/256
fsys/2048
10
11
fsys/2
fsys/4
fsys/32
fsys/128
fsys/1024
fsys/8192
Do not select.
Note: When selecting the peripheral devices’ clock select bits 1, 0 = “012”, be sure that system clock fsys does not exceed 10 MHz.
75
76
Fig. 84 Block diagram of clock generating circuit
R
S
Q
WIT
instruction
Interrupt
request
R
S
Q
External clock
input select bit
STP
instruction
Interrupt
request
Wait mode
XIN
XOUT
fXIN
f/n
STP
instruction
R
S
Q
0
1
System clock
select bit
1
0
Wait mode
fsys
1
CPU wait
request
Wait mode
: bit 0 at address 6116
: bits 6, 7 at address 6116
: bit 1 at address 6216
: bit 3 at address 6316
: bit 1 at address BC16
: bits 2, 3 at address BC16
: bit 5 at address BC16
: bits 6, 7 at address BC16
1/2
1
0
BIU : Bus interface Unit
CPU : Central Processing Unit
❈
: Signal generated when the watchdog timer’s most significant bit becomes “0”.
• Watchdog timer frequency select bit
• Watchdog timer clock source select bit at stop state termination
• External clock input select bit
• System clock stop select bit at WIT
• PLL circuit operation enable bit
• PLL multiplication ratio select bits
• System clock select bit
• Peripheral device’s clock select bits 0, 1
Reset
VCONT
fX16
fX32
fX64
fX128
fPLL
1/2
f4096
1/16
0
1
Wf512
Wf32
Watchdog timer
frequency select bit
1/8
fX16
fX32
fX64
fX128
External clock input select bit
(Clock for CPU)
φ CPU
(Clock for BIU)
φ BIU
1/8
Watchdog timer clock source select
bit at stop state termination
1/16
1/4
System clock frequency select bit
1/8
f1
f2
f16
f64
f512
0
1
❈
Watchdog
timer
Interrupt
request
Operating clock for timer A
Operating clock for
serial I/O, timer B
A-D conversion frequency
(φAD) clock source
RY
PLL frequency
multiplier
0
Peripheral
device’s clock
select bit 0
P
REL
PLL circuit operation enable bit
Peripheral
device’s clock
select bit 1
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IMIN
PLL multiplication ratio select bits
System clock stop select bit at WIT
Wait mode
Peripheral device’s clocks
MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
A
IMIN
MITSUBISHI MICROCOMPUTERS
RY
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7
6
5
4
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
3
2
1
1
0
1
Clock control register 0
Address
BC16
Fix this bit to “1”.
PLL circuit operation enable bit (Note 1)
0: PLL frequency multiplier is inactive, and pin VCONT is invalid (floating state).
1: PLL frequency multiplier is active, and pin VCONT is valid.
PLL multiplication ratio select bits (Note 2)
00: Do not select.
01: Double
10: Triple
11: Quadruple
Fix this bit to “1”.
System clock select bit (Note 3)
0: fXIN
1: fPLL
Peripheral device’s clock select bits 1, 0
See Table 10.
Notes 1: When not using the PLL frequency multiplier, be sure to clear this bit to “0”.
In the stop mode, the PLL circuit stops its operation regardless of this bit’s content; at this
time, pin VCONT is invalid.
2: When rewriting this bit, be sure to clear bit 5 to “0” simultaneously. Also, after this bit is
rewritten, insert a waiting time of 2 ms, and then set bit 5 to “1”.
3: When the PLL circuit operation enable bit (bit 1) has been cleared to “0”, this bit will also
be cleared to “0”. When bit 1 = “0”, nothing can be written to this bit. (Fixed to be “0”.)
Fig. 85 Bit configuration of clock control register 0
7
0
6
5
4
0
0
3
2
1
0
Particular function select register 0
Address
6216
STP instruction invalidity select bit (Note)
0: STP instruction is valid.
1: STP instruction is invalid.
External clock input select bit (Note)
0: Oscillation circuit is active. (The oscillator is connected.)
Watchdog timer is used at stop mode termination.
1: Oscillation circuit is inactive. (The externally-generated clock is input.)
When the system clock select bit = “0”,
watchdog timer is not used at stop mode termination.
When the system clock select bit = “1”,
watchdog timer is used at stop mode termination.
Fix this bit to “0”.
Note: Writing to these bits requires the following procedure:
• Write “5516” to this register. (The bit status does not change only by this writing.)
• Succeedingly, write “0” or “1” to each bit.
Also, use the MOVM (MOVMB) instruction or STA (STAB, STAD) instruction
Fig. 86 Bit configuration of particular function select register 0
77
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M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
STANDBY FUNCTION
STP mode
The standby function provides the stop (hereafter called STP) and
the wait (hereafter called WIT) mode. These modes are used to save
the power dissipation of the system, by making oscillation or system
clock inactive in the case that the CPU needs not be active.
The microcomputer enters the STP or WIT mode by executing the
STP or WIT instruction, and either mode is terminated by acceptance
of an interrupt request or reset.
To terminate the STP or WIT mode by an interrupt request, the interrupt to be used for termination of the STP or WIT mode must be enabled in advance to execution of the STP or WIT instruction. The
interrupt priority level of this interrupt needs to be higher than the
processor interrupt priority level (IPL) of the routine where the STP
or WIT instruction will be executed.
Figures 86 through 88 show the bit configurations of the particular
function select registers 0, 1, and watchdog timer frequency select
register respectively. Setting the STP instruction invalidity select bit
(bit 0 of the particular function select register 0) to “1” invalidates the
STP instruction, and the STP instruction will be ignored. Since the
above bit is cleared to “0” after reset is removed, however, the STP
instruction is valid.
The STP- or the WIT-instruction-execution status bit (bit 0 or 1 of the
particular function select register 1) is set to “1” by the execution of
the STP or the WIT instruction, and so, after the STP or WIT mode
has been terminated, each bit will indicate that the STP or WIT instruction has been executed. Accordingly, each of these bits must be
cleared to “0” by software at termination of the STP or the WIT mode.
Table 11 explains the microcomputer’s operation in the STP and WIT
modes.
The execution of the STP instruction makes the oscillation circuit and
PLL circuit inactive. It also makes the following inactive: input clock
fXIN, system clock fsys, φBIU, φCPU, and peripheral devices’ clocks f1
to f4096, Wf32 and Wf512 with the “L” state, and divide clocks fX16 to
fX128 with the “H” state. In the watchdog timer, “FFF16” is automatically set. As shown in Figure 84, any one of divide clocks fX16 to
fX128, which is selected by the watchdog timer clock source select
bits at STP termination (bits 6 and 7 of the watchdog timer frequency
select register), becomes the watchdog timer’s clock source.
In the STP mode, the A-D converter and watchdog timer, which uses
peripheral devices’ clocks f1 to f4096, Wf32 and Wf512, are stopped.
At this time, timers A and B can be active only in the event counter
mode, and serial I/O communication is active while an external clock
is selected.
The STP mode is terminated by acceptance of an interrupt request
or reset, and the oscillation circuit and PLL circuit restart their operations. Input clock fXIN, system clock fsys, and peripheral devices’
clocks f1 to f4096, Wf32 and Wf512 are also supplied.
When the STP mode is terminated by reset, supply of φBIU and φCPU
starts immediately after the oscillation circuit and PLL circuit restart
their operations. Therefore, the reset input must be raised “H” after
the operation-stabilizing time for these circuits has passed.
The following two modes are available in order to terminate the STP
mode by an interrupt:
(1) The watchdog timer is used in order to measure the period from
the operation restart of the oscillation circuit and PLL circuit until
the supply start of φBIU and φCPU.
(2) The supply of φBIU and φCPU is started immediately after the operation restart of the oscillation circuit and PLL circuit.
Table 11. Microcomputer’s operation in STP and WIT modes
Mode
STP
System clock
stop select bit
at WIT
Oscillation
PLL circuit
circuit
Operations of function while WIT, STP modes
fsys, φ1,
Wf32, Wf512 φBIU, φCPU Peripheral devices using f1 to f4096, Wf32, Wf512
f1 to f4096
—
Inactive
Inactive
Inactive
(“L”)
Inactive
(“L”)
Inactive
(“L”)
“0”
Active
(Note 1)
Active
(Note 2)
Active
Inactive
(“L”)
Inactive
(“L”)
WIT
“1”
Active
(Note 1)
Active
(Note 2)
Inactive
(“L”)
Inactive
(“L”)
Inactive
(“L”)
Timers A, B: Operation is enabled only in the event
counter mode.
Serial I/O: Operation is enabled only while an external
clock is selected.
A-D converter: Inactive.
(Watchdog timer: Inactive.)
Timers A, B, Serial I/O, A-D converter: Operation is enabled.
(Watchdog timer: Inactive.)
Timers A, B: Operation is enabled only in the event
counter mode.
Serial I/O: Operation is enabled only while an external
clock is selected.
A-D converter: Inactive.
(Watchdog timer: Inactive.)
Notes 1: When the external clock input select bit = “1”, the oscillation circuit is inactive. Also, clock input from pin XIN is allowed.
2: When the PLL operation enable bit = “0”, the PLL circuit is inactive.
78
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M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
When the external clock input select bit (bit 1 of the particular function select register 0) = “0” or the system clock select bit (bit 5 of the
clock control register 0) = “1”, the watchdog timer will start counting
down with one of the above divide clocks, fX16 to fX128, after the oscillation circuit and PLL circuit have been restarted their operations
owing to an interrupt. The most significant bit of the watchdog timer
reaching “0”, supply of φBIU and φCPU restarts.
On the other hand, when the external clock input select bit = “1 ” and
the system clock select bit = “0”, supply of φBIU and φCPU will restart
immediately after the oscillation circuit and PLL circuit have been restarted their operations owing to an interrupt. (In actual fact, after the
selected one of the above divide clocks, fX16 to fX128, has been
changed from “H” to “L”, this supply will restart.)
7
6
5
4
3
2
0
1
0
0
Particular function select register 1
Address
6316
STP-instruction-execution status bit (Note 1)
0: Normal operation.
1: STP instruction is under execution.
WIT-instruction-execution status bit (Note 1)
0: Normal operation.
1: WIT instruction is under execution.
Fix this bit to “0”.
System clock stop select bit at WIT (Note 2)
0: In wait mode, system clock fsys is active.
1: In wait mode, system clock fsys is inactive.
Fix this bit to “0”.
Timer B2 clock source select bit
Valid in event counter mode:
0: Clock input from pin TB2IN is counted.
1: fX32 (f(XIN)/32) is counted.
Notes 1: At power-on reset, this bit becomes “0”. At hardware reset or software reset, this bit retains
the value just before reset. Even when “1” is try to be written, the bit status will not change.
2: Setting this bit to “1” must be performed just before execution of the WIT instruction. Also,
after the wait state is terminated, this bit must be cleared to “0” immediately.
Fig. 87 Bit configuration of particular function select register 1
7
6
5
4
3
2
1
0
Watchdog timer frequency select register
Address
6116
Watchdog timer frequency select bit
0 : Select W f512
1 : Select W f32
Watchdog timer clock source select bits at STP termination
0 0 : fX32
0 1 : fX16
1 0 : fX128
1 1 : fX64
Fig. 88 Bit configuration of watchdog timer frequency select register
79
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M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
WIT mode
When the WIT instruction is executed with the system clock stop select bit at WIT (bit 3 of the particular function select register 1 in Figure 87) being “0”, φBIU, φCPU, and divide clocks Wf32 and Wf512 are
inactive with the “L“ state. However, the oscillation circuit, PLL circuit,
input clock fXIN, system clock fsys, φ1, and peripheral devices’ clocks
f1 to f4096 remain active. Therefore, BIU and CPU are inactive,
whereas timers A and B, serial I/O, and the A-D converter, which use
the peripheral devices’ clocks f1 to f4096, are still active. Note that the
watchdog timer is inactive.
On the other hand, when the WIT instruction is executed with the
system clock stop select bit at WIT being “1”, the oscillation circuit,
PLL circuit, and input clock fXIN are active, while system clock fsys,
φBIU, φCPU, and peripheral devices’ clocks are inactive. As a result,
the A-D converter and watchdog timer, which use peripheral devices’
clocks f1 to f4096, Wf32 and Wf512, become inactive. At this time, timers A and B are active only in the event counter mode, and serial
I/O communication is active only while an external clock is selected.
If the internal peripheral devices are not used in the WIT mode, the
latter is better because the current dissipation is more saved. Note
that the system clock stop select bit at WIT needs to be set to “1” immediately before execution of the WIT instruction and cleared to “0”
immediately after the WIT mode is terminated.
The WIT state is terminated by acceptance of an interrupt request,
and then, supply of φBIU and φCPU will restart. Since the oscillation
circuit, PLL circuit, and clock input fXIN are active in the WIT mode,
an interrupt processing can be executed just after the WIT mode termination.
80
16-BIT CMOS MICROCOMPUTER
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MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
POWER SAVING FUNCTION
The following functions can save the power dissipation of the whole
system.
(1) Inactive system clock in wait mode
In the wait mode, if the internal peripheral devices need not to operate, when the system clock stop select bit at WIT (bit 3 of the particular function select register 1) = “1”, both of system clock fsys and
peripheral devices’ clock are inactive, and the power dissipation can
be saved.
For details, refer to the section on the standby function.
(2) Inactive oscillation circuit
When an externally-generated stable clock is input to pin XIN, the
power dissipation can be saved if both of the following conditions are
met:
• the external clock input select bit (bit 1 of the particular function
select register 0) = “1”.
• the oscillation driver circuit between pins XIN and XOUT is inactive.
At this time, the output level at pin XOUT is fixed to “H”. When not using fPLL, also, the supply of φBIU and φCPU restarts just after the microcomputer returns from the stop mode, owing to an interrupt
request occurrence. Therefore, an instruction can be executed just
after the termination of the stop mode. For details, refer to the section on the clock generating circuit and standby function.
(3) Disconnection from pin VREF
When not using the A-D converter, by setting the VREF connection
select bit (bit 6 of the A-D control register 1) to “1”, the resistor ladder
network of the A-D converter will be disconnected from the reference
voltage input pin (VREF). In this case, no current flows from pin VREF
to the resistor ladder network, and the power dissipation can be
saved. Note that, after the VREF connection select bit changes from
“1” (VREF disconnected) to “0” (VREF connected), be sure that a waiting time of 1 µs or more has passed before the A-D conversion
starts. For details, refer to the section on the A-D converter.
81
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M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
DEBUG FUNCTION
When the CPU fetches an instruction code, an interrupt request will
be generated if a selected condition is satisfied, as a resultant of
comparison between a specified address and the start address
where the instruction code is stored (the contents of PG and PC).
The decision whether this condition is satisfied or not is called address matching detection, and the interrupt generated by this detection is called an address matching detection interrupt. (For interrupt
vector addresses, refer to the section on interrupts.)
In the address matching detection, a non-maskable interrupt routine
is proceeded without execution of the original instruction which has
been allocated to the target address.
The debug function provides the following two modes:
• the address matching detection mode, which is used to avoid the
area where program exists or modify a program.
• the out-of-address-area detection mode, which is used to detect a
program runaway.
Figure 89 shows the block diagram of the debug function. Figures 90
and 91 show the bit configurations of the debug control registers 0,
1, and address compare registers 0,1, respectively.
The detect condition select bits of the debug control register 0 can
select one condition between the following 4 conditions. When the
selected address condition is satisfied, an address matching detection interrupt request will be generated:
(1) Address matching detection 0
The contents of PG and PC match with the address which has
been set in the address compare register 0.
(2) Address matching detection 1
The contents of PG and PC match with the address which has
been set in the address compare register 1.
(3) Address matching detection 2
The contents of PG and PC match with the address which has
been set in either of the address compare register 0 or address
compare register 1.
(4) Out-of-address-area detection
The contents of PG and PC are less than the address which has
been set in the address compare register 0 or larger than the address which has been set in the address compare register 1.
By setting the detect enable bit of the debug control register 0 to “1”,
an address matching detection interrupt request will be generated if
any one of the above address conditions is satisfied. Clearing the
detect enable bit to “0” generates no interrupt request even if any of
the above address conditions is satisfied.
The address compare register access enable bit of the debug control register 1 must be set to “1” by the instruction just before the access operation (read/write). Then, this bit must be cleared to “0”
(disabled) by the next instruction. While this bit = “0”, the address
compare registers 0, 1 cannot be accessed.
The address-matching-detection 2 decision bit of the debug control
register 1 decides, whether the address which has been set in the
address compare register 0 or 1 matches with the contents of PG,
PC, when the address matching detection 2 is selected. The contents of this bit is invalid when address matching detection 0 or 1 is
selected.
In order to use the debug function to avoid the area where program
exists or modify a program, perform the necessary processing within
an address matching interrupt routine. As a result, the contents of
PG, PC, PS at acceptance of an address matching detection interrupt request (i.e. the address at which an address matching detection condition is satisfied) have been pushed on to the stack. If a
return destination address after the interrupt processing is to be altered, rewrite the contents of the stack, and then return by the RTI
instruction.
To use the debug function to detect a program runaway, set an address area where no program exists into the address compare registers 0 and 1 by using the out-of-address-area detection. When the
CPU fetches instruction codes from this address area and executes
them, an address matching detection interrupt request will be generated.
The above debug function cannot be evaluated by a debugger, so
that the debug function must not be used while a debugger is running.
Internal data bus (DB0 to DB15)
Debug control register 0
Address compare register 0
Address compare register 1
Debug control register 1
Matching • Compare register
Matching • Compare register
CPU bus (Address)
Fig. 89 Block diagram of debug function
82
Address matching
detect circuit
Address matching
detection interrupt
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7
6
1
0
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
5
4
3
0
0
2
1
0
Debug control register 0
Address
6616
Detect condition select bits (Note 1)
000: Do not select.
001: Address matching detection 0
010: Address matching detection 1
011: Address matching detection 2
100: Do not select.
101: Out-of-address-area detection
110: Do not select.
111: Do not select.
Fix this bit to “0” (Note 1).
Detect enable bit (Note 1)
0: Detection disabled.
1: Detection enabled.
Fix this bit to “0” (Note 1).
“1” at read.
7
0
6
5
4
3
1
2
1
0
Debug control register 1
0
Address
6716
Fix this bit to “0” (Note 1).
“0” at read (Note 1).
Address compare register access enable bit (Note 2)
0: Disabled
1: Enabled
Fix this bit to “1” when using the debug function.
While debugger is not used, “0” at read.
While debugger is used, “1” at read.
Address-matching-detection 2 decision bit
❈ Valid when address matching detection 2 is selected.
0: Matches with the contents of the address compare register 0.
1: Matches with the contents of the address compare register 1.
“0” at read.
Notes 1: At power-on reset, these bits = “0”; at hardware reset or software reset, these bits retain
the value just before reset.
2: Set this bit to “1” with the instruction just before the address compare register 0, 1
(addresses 6816 to 6D16) is accessed. And then, clear this bit to “0” with the instruction
just after the access.
Fig. 90 Bit configuration of debug control register 0, 1
(23)
7
(16) (15)
0 7
(8)
0 7
0
Address compare register 0
Address compare register 1
Address
6816, 6916, 6A16
6B16, 6C16, 6D16
The address to be detected (in other words, the start address of instruction) is set here.
Fig. 91 Bit configuration of address compare register 0, 1
83
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M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
ABSOLUTE MAXIMUM RATINGS
Symbol
VCC
Ratings
Unit
Power source voltage
–0.3 to 6.5
V
AVCC
Analog power source voltage
–0.3 to 6.5
V
VI
Input voltage
–0.3 to VCC+0.3
V
VO
Output voltage P10–P17, P20–P27, P50–P57, P60–P65, P70–P74, XOUT
Pd
Power dissipation
Topr
Tstg
Parameter
P10–P17, P20–P27, P50–P57, P60–P65, P70–P74,
P6OUTCUT, VCONT, VREF, XIN, RESET, BYTE, MD0, MD1
–0.3 to VCC+0.3
V
300
mW
Operating ambient temperature
–20 to 85
°C
Storage temperature
–40 to 150
°C
RECOMMENDED OPERATING CONDITIONS (Vcc = 5 V, Ta = –20 to 85 °C, unless otherwise noted)
Limits
Symbol
Parameter
Min.
Typ.
Max.
5.0
5.5
Unit
VCC
Power source voltage
AVCC
Analog power source voltage
VSS
AVSS
VIH
High-level input voltage P10–P17, P20–P27, P50–P57, P60–P65, P70–P74,
P6OUTCUT, XIN, RESET, MD0, MD1
0.8 Vcc
Vcc
V
VIL
Low-level input voltage P10–P17, P20–P27, P50–P57, P60–P65, P70–P74,
P6OUTCUT, XIN, RESET, MD0, MD1
0
0.2 VCC
V
IOH(peak)
IOH(avg)
High-level peak output current
P10–P17, P20–P27, P50–P57, P60–P65, P70–P74
–10
mA
High-level average output current P10–P17, P20–P27, P50–P57, P60–P65, P70–P74
–5
mA
IOL(peak)
Low-level peak output current
P10–P17, P20–P27, P50–P57, P70–P74
10
IOL(peak)
Low-level peak output current
P60–P65
20
mA
mA
IOL(avg)
Low-level average output current P10–P17, P20–P27, P50–P57, P70–P74
5
mA
IOL(avg)
Low-level average output current P60–P65
15
mA
f(XIN)
External clock input frequency (Note 1)
System clock frequency
20
MHz
20
MHz
f(fsys)
VCC
V
V
Power source voltage
0
V
Analog power source voltage
0
4.5
Notes 1: When using the PLL frequency multiplier, be sure that f(fsys) = 20 MHz or less.
2: The average output current is the average value of an interval of 100 ms.
3: The sum of IOL(peak) must be 110 mA or less, the sum of IOH(peak) must be 80 mA or less.
84
V
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M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
DC ELECTRICAL CHARACTERISTICS (Vcc = 5 V, Vss = 0 V, Ta = –20 to 85 °C, f(fsys) = 20 MHz, unless otherwise noted)
Symbol
Test conditions
Parameter
VOH
High-level output voltage P10–P17, P20–P27,
P55–P57, P60–P65,
P70–P74
IOH = –10 mA
VOL
Low-level output voltage P10–P17, P20–P27,
P55–P57, P60–P65,
P70–P74
IOL = 10 mA
VT+ —VT–
Hysteresis
VT+ —VT–
VT+ —VT–
IIH
High-level input current P10–P17, P20–P27,
P50–P57, P60–P65,
P70–P74, P6OUTCUT, XIN,
RESET, MD0, MD1
Low-level input current P10–P17, P20–P27,
P50–P57, P60–P65,
P70–P74, P6OUTCUT, XIN,
RESET, MD0, MD1
IIL
Min.
Limits
Typ.
Max.
Unit
V
3
2
V
0.4
1
V
Hysteresis RESET
0.5
1.5
V
Hysteresis XIN
0.1
VI = 5.0 V
0.3
5
V
µA
VI = 0 V
–5
µA
50
mA
Ta = 25 °C when
clock is inactive.
1
µA
Ta = 85 °C when
clock is inactive.
20
TA0IN–TA2IN, TA4IN, TA9IN,
TA0OUT–TA2OUT, TA4OUT, TA9OUT,
TB0IN–TB2IN, INT3–INT7, CTS0,
CTS1, CLK0, CLK1, RxD0, RxD1,
RTPTRG0, P6OUTCUT
VRAM
RAM hold voltage
ICC
Power source current
When clock is inactive.
Output-only pins
are open, and the
other pins are connected to Vss or
Vcc. An external
square-waveform
clock is input. (Pin
XOUT is open.) The
PLL frequency
multiplier is inactive.
f(fsys) = 20 MHz.
CPU is active.
V
2
25
85
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MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
A-D CONVERTER CHARACTERISTICS
(VCC = AVCC = 5 V ± 0.5 V, VSS = AVSS = 0 V, Ta = –20 to 85 °C, unless otherwise noted)
Symbol
—————
Parameter
Resolution
Test conditions
VREF = VCC
—————
Absolute accuracy
VREF = VCC
RLADDER
Ladder resistance
VREF = VCC
tCONV
Conversion time
VREF
Reference voltage
VIA
Analog input voltage
f(fsys) ≤ 20 MHz
Limits
Min.
Typ.
10
A-D converter
Comparator
Unit
Bits
1
VREF V
256
±3
LSB
±2
LSB
± 40
mV
kΩ
10-bit resolution mode
8-bit resolution mode
Comparater
5
10-bit resolution mode
8-bit resolution mode
Comparater
Max.
5.9
µs
2.45 (Note)
0.7 (Note)
2.7
VCC
0
VREF
V
V
Note: This is applied when A-D conversion freguency (φAD) = f1 (φ).
D-A CONVERTER CHARACTERISTICS
(VCC = 5 V, VSS = AVSS = 0 V, VREF = 5 V, Ta = –20 to 85 °C, unless otherwise noted)
Symbol
Test conditions
Parameter
——
Resolution
——
Absolute accuracy
tsu
Set time
RO
Output resistance
IVREF
Reference power source input current
Min.
Limits
Typ.
Max.
8
Bits
± 1.0
%
µs
kΩ
mA
3
2
3.5
(Note)
Unit
4.5
3.2
Note: The test conditions are as follows:
• One D-A converter is used.
• The D-A register value of the unused D-A converter is “0016.”
• The reference power source input current for the ladder resistance of the A-D converter is excluded.
RESET INPUT
Reset input timing requirements (VCC = 5 V ± 0.5 V, VSS = 0V, Ta = –20 to 85 °C, unless otherwise noted)
Parameter
Symbol
tw(RESETL)
RESET input low-level pulse width
RESET input
tw(RESETL)
86
Min.
10
Limits
Typ.
Max.
Unit
µs
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MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
PERIPHERAL DEVICE INPUT/OUTPUT TIMING
(VCC = 5 V±0.5 V, VSS = 0 V, Ta = –20 to 85 °C, f(fsys) = 20 MHz unless otherwise noted)
For limits depending on f(fsys), their calculation formulas are shown below. Also, the values at f(fsys) = 20 MHz are shown in ( ).
∗
Timer A input (Count input in event counter mode)
Symbol
Limits
Parameter
Min.
Max.
Unit
tc(TA)
TAiIN input cycle time
80
ns
tw(TAH)
TAiIN input high-level pulse width
40
ns
tw(TAL)
TAiIN input low-level pulse width
40
ns
Timer A input (Gating input in timer mode)
Symbol
Limits
Parameter
Min.
tc(TA)
TAiIN input cycle time
f(fsys) ≤ 20 MHz
tw(TAH)
TAiIN input high-level pulse width
f(fsys) ≤ 20 MHz
16 × 109
f(fsys)
8 × 109
f(fsys)
f(fsys) ≤ 20 MHz
8×
f(fsys)
tw(TAL)
TAiIN input low-level pulse width
109
Max.
Unit
(800)
ns
(400)
ns
(400)
ns
Note : The TAiIN input cycle time requires 4 or more cycles of a count source. The TAiIN input high-level pulse width and the TAiIN input low-level pulse width
respectively require 2 or more cycles of a count source. The limits in this table are applied when the count source = f2 at f(fsys) ≤ 20 MHz.
Timer A input (External trigger input in one-shot pulse mode)
Symbol
Limits
Parameter
Min.
f(fsys) ≤ 20 MHz
8 × 109
f(fsys)
Max.
Unit
tc(TA)
TAiIN input cycle time
tw(TAH)
TAiIN input high-level pulse width
80
ns
tw(TAL)
TAiIN input low-level pulse width
80
ns
ns
(400)
Timer A input (External trigger input in pulse width modulation mode)
Symbol
Parameter
Limits
Min.
Max.
Unit
tw(TAH)
TAiIN input high-level pulse width
80
ns
tw(TAL)
TAiIN input low-level pulse width
80
ns
Timer A input (Up-down input and Count input in event counter mode)
Symbol
Parameter
Limits
Min.
Max.
Unit
tc(UP)
TAiOUT input cycle time
2000
ns
tw(UPH)
TAiOUT input high-level pulse width
1000
ns
tw(UPL)
TAiOUT input low-level pulse width
1000
ns
tsu(UP-TIN)
TAiOUT input setup time
400
ns
th(TIN-UP)
TAiOUT input hold time
400
ns
87
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MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
Timer A input (Two-phase pulse input in event counter mode)
Symbol
Limits
Parameter
Min.
Max.
Unit
tc(TA)
TAjIN input cycle time
800
ns
tsu(TAjIN-TAjOUT)
TAjIN input setup time
200
ns
tsu(TAjOUT-TAjIN)
TAjOUT input setup time
200
ns
• Gating input in timer mode
• Count input in event counter mode
• External trigger input in one-shot pulse mode
• External trigger input in pulse width modulation mode
tc(TA)
tw(TAH)
TAiIN input
tw(TAL)
• Up-down and Count input in event counter mode
tc(UP)
tw(UPH)
TAiOUT input
(Up-down input)
tw(UPL)
TAiOUT input
(Up-down input)
TAiIN input
(When count by falling)
th(TIN-UP)
tsu(UP-TIN)
TAiIN input
(When count by rising)
• Two-phase pulse input in event counter mode
tc(TA)
TAjIN input
tsu(TAjIN-TAjOUT)
tsu(TAjIN-TAjOUT)
tsu(TAjOUT-TAjIN)
TAjOUT input
tsu(TAjOUT-TAjIN)
Test conditions
• VCC = 5 V ± 0.5 V, Ta = –20 to 85 °C
• Input timing voltage : VIL = 1.0 V, VIH = 4.0 V
88
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REL
MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
Timer B input (Count input in event counter mode)
Symbol
Limits
Parameter
Min.
Max.
Unit
tc(TB)
TBiIN input cycle time (one edge count)
80
ns
tw(TBH)
TBiIN input high-level pulse width (one edge count)
40
ns
tw(TBL)
TBiIN input low-level pulse width (one edge count)
40
ns
tc(TB)
tw(TBH)
TBiIN input cycle time (both edge count)
TBiIN input high-level pulse width (both edge count)
160
80
ns
ns
tw(TBL)
TBiIN input low-level pulse width (both edge count)
80
ns
Timer B input (Pulse period measurement mode)
Symbol
tc(TB)
Limits
Parameter
Min.
f(fsys) ≤ 20 MHz
TBiIN input cycle time
tw(TBH)
TBiIN input high-level pulse width
f(fsys) ≤ 20 MHz
tw(TBL)
TBiIN input low-level pulse width
f(fsys) ≤ 20 MHz
Unit
Max.
16 × 109
(800)
f(fsys)
8×
f(fsys)
8 × 109
f(fsys)
109
ns
(400)
ns
(400)
ns
Note: The TBiIN input cycle time requires 4 or more cycles of a count source. The TBiIN input high-level pulse width and the TBiIN input low-level pulse width
respectively require 2 or more cycles of a count source. The limits in this table are applied when the count source = f2 at f(fsys) ≤ 20 MHz.
Timer B input (Pulse width measurement mode)
Symbol
tc(TB)
Limits
Parameter
TBiIN input cycle time
Min.
f(fsys) ≤ 20 MHz
tw(TBH)
TBiIN input high-level pulse width
f(fsys) ≤ 20 MHz
tw(TBL)
TBiIN input low-level pulse width
f(fsys) ≤ 20 MHz
16 ×
f(fsys)
109
8×
f(fsys)
8 × 109
f(fsys)
109
Unit
Max.
(800)
ns
(400)
ns
(400)
ns
Note: The TBiIN input cycle time requires 4 or more cycles of a count source. The TBiIN input high-level pulse width and the TBiIN input low-level pulse width
respectively require 2 or more cycles of a count source. The limits in this table are applied when the count source = f2 at f(fsys) ≤ 20 MHz.
Serial I/O
Symbol
Parameter
Limits
Min.
Max.
Unit
tc(CK)
CLKi input cycle time
200
ns
tw(CKH)
tw(CKL)
CLKi input high-level pulse width
CLKi input low-level pulse width
100
100
ns
ns
td(C-Q)
TXDi output delay time
th(C-Q)
TXDi hold time
tsu(D-C)
th(C-D)
80
ns
0
ns
RXDi input setup time
20
ns
RXDi input hold time
90
ns
89
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MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
External interrupt (INTi) input
Symbol
Limits
Parameter
Min.
Max.
Unit
tw(INH)
INTi input high-level pulse width
250
ns
tw(INL)
INTi input low-level pulse width
250
ns
tc(TB)
tw(TBH)
TBiIN input
tw(TBL)
tc(CK)
tw(CKH)
CLKi input
tw(CKL)
th(C-Q)
TxDi output
td(C-Q)
tsu(D-C)
RxDi input
tw(INL)
INTi input
tw(INH)
Test conditions
• Vcc = 5 V ± 0.5 V, Ta = –20 to 85 °C
• Input timing voltage : VIL = 1.0 V, VIH = 4.0 V
• Output timing voltage : VOL = 0.8 V, VOH = 2.0 V, CL = 50 pF
90
th(C-D)
A
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REL
MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
External clock input
Timing Requirements (VCC = 5 V±0.5 V, VSS = 0 V, Ta = –20 to 85 °C, f(XIN) = 20 MHz, unless otherwise noted)
Symbol
Limits
Parameter
Min.
Max.
Unit
ns
tc
External clock input cycle time
tw(half)
External clock input pulse width with half input-voltage
0.45 tc
tw(H)
tw(L)
External clock input high-level pulse width
External clock input low-level pulse width
0.5 tc – 8
0.5 tc – 8
tr
External clock input rise time
8
ns
tf
External clock input fall time
8
ns
50
External clock input
tw(L)
tw(H)
tr
tf
0.55 tc
ns
ns
ns
tc
tw(half)
XIN
Test conditions
• Vcc = 5 V ± 0.5 V, Ta = –20 to 85 °C
• Input timing voltage
: VIL = 1.0 V, VIH = 4.0 V (tw(H), tw(L), tr, tf)
• Output timing voltage : 2.5 V (tc, tw(half))
91
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L
MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
PACKAGE OUTLINE
42P2R-E
Plastic 42pin 450mil SSOP
EIAJ Package Code
SSOP42-P-450-0.80
Weight(g)
–
JEDEC Code
–
e
b2
I2
22
Recommended Mount Pad
E
HE
e1
42
Lead Material
Cu Alloy+42 Alloy
F
Symbol
1
A
A1
A2
b
c
D
E
e
HE
L
L1
z
Z1
y
21
G
D
A
A2
e
A1
b
L
L1
y
c
z
Z1
Detail G
EIAJ Package Code
SDIP42-P-600-1.78
JEDEC Code
–
b2
e1
I2
Detail F
42P4B
Dimension in Millimeters
Min
Nom
Max
2.4
–
–
–
0.05
–
–
2.0
–
0.4
0.3
0.25
0.2
0.15
0.13
17.7
17.5
17.3
8.6
8.4
8.2
–
0.8
–
12.23
11.93
11.63
0.7
0.5
0.3
–
1.765
–
–
0.75
–
–
–
0.9
0.15
–
–
0°
–
10°
–
0.5
–
–
11.43
–
–
1.27
–
Plastic 42pin 600mil SDIP
Lead Material
Alloy 42/Cu Alloy
22
1
21
E
42
e1
c
Weight(g)
4.1
Symbol
L
A1
A
A2
D
e
SEATING PLANE
92
b1
b
b2
A
A1
A2
b
b1
b2
c
D
E
e
e1
L
Dimension in Millimeters
Min
Nom
Max
–
–
5.5
0.51
–
–
–
3.8
–
0.35
0.45
0.55
0.9
1.0
1.3
0.63
0.73
1.03
0.22
0.27
0.34
36.5
36.7
36.9
12.85
13.0
13.15
–
1.778
–
–
15.24
–
3.0
–
–
0°
–
15°
A
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REL
MITSUBISHI MICROCOMPUTERS
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
16-BIT CMOS MICROCOMPUTER
Keep safety first in your circuit designs!
•
Mitsubishi Electric Corporation puts the maximum effort into making semiconductor products better and more reliable, but there is always the possibility that trouble may occur with them. Trouble with semiconductors may lead to
personal injury, fire or property damage. Remember to give due consideration to safety when making your circuit designs, with appropriate measures such as (i) placement of substitutive, auxiliary circuits, (ii) use of non-flammable
material or (iii) prevention against any malfunction or mishap.
•
These materials are intended as a reference to assist our customers in the selection of the Mitsubishi semiconductor product best suited to the customer’s application; they do not convey any license under any intellectual property
rights, or any other rights, belonging to Mitsubishi Electric Corporation or a third party.
Mitsubishi Electric Corporation assumes no responsibility for any damage, or infringement of any third-party’s rights, originating in the use of any product data, diagrams, charts, programs, algorithms, or circuit application examples
contained in these materials.
All information contained in these materials, including product data, diagrams, charts, programs and algorithms represents information on products at the time of publication of these materials, and are subject to change by
Mitsubishi Electric Corporation without notice due to product improvements or other reasons. It is therefore recommended that customers contact Mitsubishi Electric Corporation or an authorized Mitsubishi Semiconductor product
distributor for the latest product information before purchasing a product listed herein.
The information described here may contain technical inaccuracies or typographical errors. Mitsubishi Electric Corporation assumes no responsibility for any damage, liability, or other loss rising from these inaccuracies or errors.
Please also pay attention to information published by Mitsubishi Electric Corporation by various means, including the Mitsubishi Semiconductor home page (http://www.mitsubishichips.com).
When using any or all of the information contained in these materials, including product data, diagrams, charts, programs, and algorithms, please be sure to evaluate all information as a total system before making a final decision
on the applicability of the information and products. Mitsubishi Electric Corporation assumes no responsibility for any damage, liability or other loss resulting from the information contained herein.
Mitsubishi Electric Corporation semiconductors are not designed or manufactured for use in a device or system that is used under circumstances in which human life is potentially at stake. Please contact Mitsubishi Electric
Corporation or an authorized Mitsubishi Semiconductor product distributor when considering the use of a product contained herein for any specific purposes, such as apparatus or systems for transportation, vehicular, medical,
aerospace, nuclear, or undersea repeater use.
The prior written approval of Mitsubishi Electric Corporation is necessary to reprint or reproduce in whole or in part these materials.
If these products or technologies are subject to the Japanese export control restrictions, they must be exported under a license from the Japanese government and cannot be imported into a country other than the approved
destination.
Any diversion or reexport contrary to the export control laws and regulations of Japan and/or the country of destination is prohibited.
Please contact Mitsubishi Electric Corporation or an authorized Mitsubishi Semiconductor product distributor for further details on these materials or the products contained therein.
Notes regarding these materials
•
•
•
•
•
•
•
© 2001 MITSUBISHI ELECTRIC CORP.
New publication, effective Nov. 2001.
Specifications subject to change without notice.
Revision History
Rev.
No.
1.0
2.0
3.0
M37906MxX-XXXFP/SP Datasheet
Revision Description
First Edition. The following are released.
• DESCRIPTION
• Timer function for motor control
• Pulse output port mode
(1) The following are revised:
• Figure 42 in page 36; the description for bits 6 and 7 of the timer Ax (x = 0 to 3) mode register
<Error> (See the table below.)
<Correction> (See Table 7.)
• Figure 50 in page 43; the description for bits 6 and 7 of the timer Ax (x = 0, 3) mode register
<Error> (See Fig. 42.)
<Correction> (See Table 7.)
(2) The following are added:
BASIC FUNCTION BLOCKS, MEMORY, CENTRAL PROCESSING UNIT (CPU),
BUS INTERFACE UNIT, PROCESSOR MODES, INTERRUPTS, TIMER A, TIMER B,
SERIAL I/O PORTS, A-D CONVERTER, D-A CONVERTER, WATCHDOG TIMER,
INPUT/OUTPUT PINS, RESET CIRCUIT, OSCILLATION CIRCUIT,
CLOCK GENERATING CIRCUIT, STANDBY FUNCTION, POWER SAVING FUNCTION,
DEBUG FUNCTION, ELECTRICAL CHARACTERISTICS, PACKAGE OUTLINE,
MASK ROM CONFIRMATION FORM, MARK SPECIFICATION FORM
The new information added in Rev.3.0 are described in Corrections and Supplementary
Rev.
date
000331
000515
000807
Explanation for “M37906MxC Datasheet (Rev.A)”.
4.0
5.0
Refer to “Corrections and Supplementary Explanation for M37906MxC-XXXFP/SP
Datasheet (Rev.B)”.
Note : ★ represents the new information added in Rev.4.0.
Refer to “Corrections and Supplementary Explanation for M37906MxX-XXXFP/SP
Datasheet (Rev.C)”.
Note : ★ represents the new information added in Rev.5.0.
(1/1)
010706
011113
Corrections and Supplementary Explanation for M37906MxX Datasheet (Rev.C) No.1
Page
★
Error
All pages,
Header
Correction
M37906M4C-XXXFP, M37906M4C-XXXSP
M37906M4H-XXXFP, M37906M4H-XXXSP
M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
M37906M4C-XXXFP, M37906M4C-XXXSP
M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
★ [M37906M4C-XXXFP, M37906M4C-XXXSP]
Page 1,
DISTINCTIVE
FEATURES;
Memory
ROM................................................................32 Kbytes
RAM..................................................................1 Kbyte
[M37906M4C-XXXFP, M37906M4C-XXXSP]
[M37906M4H-XXXFP, M37906M4H-XXXSP] (Note)
ROM................................................................32 Kbytes
RAM..................................................................1 Kbyte
[M37906M6C-XXXFP, M37906M6C-XXXSP]
ROM................................................................48 Kbytes
RAM..................................................................3 Kbytes
[M37906M8C-XXXFP, M37906M8C-XXXSP]
ROM................................................................60 Kbytes
RAM..................................................................3 Kbytes
• 8-bit A-D converter............................2-channel outputs
★
Note: The M37906M4C-XXXFP/SP and the M37906M4HXXXFP/SP have the same functions, distinctive
features, and electrical characteristics.
Page 1,★ M37906MxC-XXXFP PIN CONFIGURATION (TOP VIEW)
PIN★ (Type)
M37906M4C-XXXFP
CONFIGURATION
of outline 42P2R-E
M37906MxX-XXXFP PIN CONFIGURATION (TOP VIEW)
(Type)
M37906M6C-XXXFP
M37906M8C-XXXFP
INT4
(Type)
Pages 1, 2
PIN CONFIGURATION of outlines
42P2R-E and
42P4B
M37906M4C-XXXFP
M37906M4H-XXXFP
M37906M6C-XXXFP
M37906M8C-XXXFP
P6OUTCUT/INT4
★
Page 2, M37906MxC-XXXSP PIN CONFIGURATION (TOP VIEW)
PIN★
CONFIGURATION
of outline 42P4B
• 8-bit D-A converter............................2-channel outputs
M37906M4C-XXXSP
M37906M6C-XXXSP
M37906M8C-XXXSP
M37906MxX-XXXSP PIN CONFIGURATION (TOP VIEW)
(Type)
M37906M4C-XXXSP
M37906M4H-XXXSP
M37906M6C-XXXSP
M37906M8C-XXXSP
INT4
P6OUTCUT/INT4
P74/AN4/DA 1/INT3/RTP TRG0
(Note) P74/AN4/DA 1/INT3/RTP TRG0
P57/INT7/TB2IN/IDU
P56/INT6/TB1IN/IDV
P55/INT5/TB0IN/IDW
(Note)
P24(/TB0IN)
P25(/TB1IN)
P26(/TB2IN)
P26(/INT3/RTPTRG0)
P24(/TB0IN)
P25(/TB1IN)
P26(/TB2IN)
P26(/INT3/RTPTRG0)
(Note)
Note: Allocation of these pins can be switched by
software.
( ) : Shift function
Page 3,
P57/INT7/TB2IN/IDU
P56/INT6/TB1IN/IDV
P55/INT5/TB0IN/IDW
P6OUTCUT
INT4
BLOCK
DIAGRAM
ROM
32 Kbytes
★
RAM
1 Kbyte
ROM
(Note)
Note:
Note:
RAM
ROM
M37906M4C-XXXFP,
M37906M4C-XXXSP
M37906M6C-XXXFP,
M37906M6C-XXXSP
M37906M8C-XXXFP,
M37906M8C-XXXSP
Page 4,
FUNCTIONS
Memory
size
RAM
(Note)
32 Kbytes
1 Kbyte
48 Kbytes
3 Kbytes
60 Kbytes
3 Kbytes
RAM
1 Kbyte
ROM
32 Kbytes
(1/7)
M37906M4C-XXXFP,
M37906M4C-XXXSP
M37906M4H-XXXFP,
M37906M4H-XXXSP
M37906M6C-XXXFP,
M37906M6C-XXXSP
M37906M8C-XXXFP,
M37906M8C-XXXSP
Memory
size
ROM
RAM
32 Kbytes
1 Kbyte
48 Kbytes
3 Kbytes
60 Kbytes
3 Kbytes
RAM
(Note 1)
ROM
(Note 1)
Corrections and Supplementary Explanation for M37906MxX Datasheet (Rev.C) No.2
Page
Error
Page 4,
FUNCTIONS
Interrupts
Maskable
interrupts
Nonmaskable
interrupts
5 external types, 18 internal
types. •••••
Interrupts
Maskable
interrupts
Nonmaskable
interrupts
3 internal types.
5 external sources, 18 internal sources. •••••
3 internal sources.
Clock generating
circuit
Built-in (externally connected to
a ceramic resonator or quartz
crystal resonator).
Clock generating
circuit
Built-in (externally connected to
a ceramic resonator or quartzcrystal oscillator).
PLL frequency
multiplier
The following multiplication
methods are avaiable : doble,
triple, and quadruple.
PLL frequency
multiplier
The following multiplication
ratios are avaiable : ✕ 2,
✕ 3, ✕ 4.
Power
dissipation
125 mW (at f(XIN) = 20 MHz, typ.,PLL
frequency multiplier stopped.)
Power
dissipation
(Note)
Package
★
Correction
125 mW (at f(fsys) = 20 MHz, typ., the
PLL frequency multiplier is inactive.)
Package
Note 1:
(Note 2)
Note 1:
32 Kbytes
ROM M37906M4C-XXXFP, M37906M4C-XXXSP
M37906M6C-XXXFP, M37906M6C-XXXSP
48 Kbytes
M37906M8C-XXXFP, M37906M8C-XXXSP
60 Kbytes
M37906M6C-XXXFP, M37906M6C-XXXSP
48 Kbytes
1 Kbyte
M37906M8C-XXXFP, M37906M8C-XXXSP
60 Kbytes
RAM M37906M4C-XXXFP, M37906M4C-XXXSP
M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
3 Kbytes
3 Kbytes
ROM M37906M4C-XXXFP, M37906M4C-XXXSP
M37906M4H-XXXFP, M37906M4H-XXXSP
RAM M37906M4C-XXXFP, M37906M4C-XXXSP
M37906M4H-XXXFP, M37906M4H-XXXSP
M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
★
1 Kbyte
3 Kbytes
3 Kbytes
2:
2:
Packages
32 Kbytes
M37906M4C-XXXFP,
M37906M6C-XXXFP,
M37906M8C-XXXFP
42-pin plastic •••••
M37906M4C-XXXSP,
M37906M6C-XXXSP,
M37906M8C-XXXSP
42-pin shrink •••••
Packages
M37906M4C-XXXFP,
M37906M4H-XXXFP,
M37906M6C-XXXFP,
M37906M8C-XXXFP
42-pin plastic •••••
M37906M4C-XXXSP,
M37906M4H-XXXSP,
M37906M6C-XXXSP,
M37906M8C-XXXSP
42-pin shrink •••••
Page 5
P6OUTCUT
[Pin],
[Name]
INT4
INT4 input
input
P6OUTCUT
•••••
[Functions] This pin functions as an input pin for INT 4. Also, this pin
functions as an input pin for a forcibly-cut-off signal in the
motor drive waveform output mode.
Page 6,
Memory
input
•••••
This pin has the function to forcibly place port P6 pins in
the input mode (port-output-cutoff function). Also, this pin
functions as an input pin for INT 4, and as an input pin for
the port-output-cutoff function in the motor drive waveform output mode.
(Line 5)
(Line 5)
The internal ROM is allocated to addresses 800016
through FFFF16, and its address space is 32 Kbytes.
The internal ROM and RAM are allocated as shown in
Figures 1 (1) through (3).
The internal RAM is allocated to addresses C0016
through FFF16, and its address space is 1 Kbyte. In
addition to storing data, the RAM is used as a stack
during a subroutine call, or interrupts.
★
P6OUTCUT input
(Deleted)
Page 6,
Right column
Line 8
Allocated to addresses 016 through FF16 are ••••••
A-D converter, D-A converter, UART, timers, interrupt
control registers, etc.
Allocated to addresses 016 through FF16 are ••••••
A-D converter, D-A converter, serial I/O, timers, interrupt
control registers, etc.
Page 6
Figure 1 (1). Memory map of M37906M4C-XXXFP/SP
(Single-chip mode)
Figure 1 (1). Memory map of M37906M4C-XXXFP/SP and
M37906M4H-XXXFP/SP (Single-chip mode)
(2/7)
Corrections and Supplementary Explanation for M37906MxX Datasheet (Rev.C) No.3
Page
Error
Correction
Memory map of M37906M6C-XXXFP/SP (Single-chip
mode)
Memory map of M37906M8C-XXXFP/SP (Single-chip
mode)
Page 7
Page 8
Page 12,
3. Interrupt disable
flag (I)
(Line 3)
(Line 3)
•••• all interrupts except watchdog timer, NMI, and software interrupt ••••
•••• all interrupts except watchdog timer and software
interrupts ••••
5
Page 20,
Fig. 11
4
3
2
1
0
5
4
3
2
Processor mode register 0
1
0
0
0
Processor mode register 0
Processor mode bits
00 : Single-chip mode
Processor mode bits
00 : Single-chip mode
•
•
Page 21,
Left column
Line 3
Page 21,
Left column
Line 21
Page 22,
Fig. 13
•
•
••• Reset is also handled as a type of interrupt in this
section, too.
••• Reset is also handled as an interrupt source in this
section, too.
The position to which pin INT3 is to be allocated can be
selected ••••
The position where pin INT3/RTPTRG0 is allocated can be
selected ••••
(Interrupt control register bit configuration for INT 3–INT7)
5
4
3
2
1
(Interrupt control register bit configuration for INT 3–INT7)
0
5
4
3
2
1
0
Interrupt priority level select bits
(Notes 1, 2)
Interrupt priority level select bits
(Note 1)
Interrupt request bit
Interrupt request bit (Note 2)
•
•
Page 39,
Fig. 43
•
•
Waveform output control bit
(bit 7 at addresss A616)
Waveform output control bit
(bit 7 at addresss A616)
D Q
D Q
R
INT4
Page 40,
Right column
Lines 5, 6
Reset
••• This bit is cleared to “0” by inputting falling edge to the
INT4 pin, by reset, or by clearing with instructions.
Page 43, Retained data can be read out ••••
Left column
Line 7
5
4
3
2
1
••• This bit is cleared to “0” by inputting a falling edge to
pin P6OUTCUT, by reset, or by executing instructions.
Retain data can be read out ••••
5
0
Page 43,
Fig. 47
R
P6OUTCUT
Reset
4
3
2
1
0
position-data-retain function control
register
position-data-retain function control
register
•
•
Retain-trigger polarity select bit
Retained trigger’s polarity select bit
•
•
Page 44,
Left column
Last line
••• count start flag to “1”, and they stop it when clearing
that flag to “0”.
Page 44,
Fig. 48
••• count start bit to “1”, and they stop it when clearing
that bit to “0”.
Waveform output control bit 1
(bit 7 at addresss A616)
Waveform output control bit 1
(bit 7 at addresss A616)
D Q
D Q
R
INT4
Page 45,
Fig. 49
Page 46,
Right column
Line 35
Page 46,
Right column
Line 51
5
4
3
2
1
R
P6OUTCUT
Reset
Reset
0
5
Waveform output control register
4
3
2
1
0
Waveform output mode register
••• the pulse to which pulse width modulation is applied
output port ••••
••• the pulse to which pulse width modulation has been
applied output port ••••
••• by reset or clearing with instructions.
••• by reset or by executing instructions.
(3/7)
Corrections and Supplementary Explanation for M37906MxX Datasheet (Rev.C) No.4
Page
Error
Page 46,
Right column
Last line
••• by inputting a falling edge to an external interrupt pin,
INT4.
••• by inputting a falling edge to pin P6OUTCUT.
Page 47,
Left column
Line 45
Page 49,
Left column
Line 5
••• by inputting a falling edge to an external interrupt pin,
INT4, or clearing with instructions.
••• by inputting a falling edge to pin P6OUTCUT, or by
executing instructions.
••• shown in Figure 55 are used to determine whether to
use port P8 as a ••••
••• shown in Figure 55 are used to determine whether to
use port P1 as a ••••
Page 49,
Fig. 55
5
4
3
2
1
Correction
0
5
UART0 Transmit/Receive mode register
UART1 Transmit/Receive mode register
Serial I/O mode select bits
000 : Serial I/O is invalid. (Port P8 functions as a programmable I/O port.)
4
3
2
1
0
UART0 Transmit/Receive mode register
UART1 Transmit/Receive mode register
Serial I/O mode select bits
000 : Serial I/O is invalid. (Port P1 functions as a programmable I/O port.)
•
•
Page 59,
Table 8
•
•
Functions
Pin P10/CTS0/RTS 0 (Note 1) Pin P11/•••
CTS2
Page 63,
P11 or CLK0
Functions
Pin P10/CTS0/RTS 0 (Note 1) Pin P11/•••
CTS0
P11 or CLK0
••• the comparator function select register is “0” and ••••
••• the comparator function select register 0 is “0” and ••••
••• the comparator result register.
••• the comparator result register 0.
••• an input pin when it is “0”.
When a pin is programmed for output, the data ••••
••• an input pin when it is “0”.
Also, each bit of the port P6 direction register can be
cleared to “0” by inputting a falling edge to pin
P6OUTCUT or by executing instructions.
When a pin is programmed for output, the data ••••
[Inside dotted-line included]
P20/TA4 OUT, P22/TA9 OUT,
P60/TA0 OUT/W/RTP00,
P61/TA0 IN/V/RTP0 1,
P62/TA1 OUT/U/RTP02,
P63/TA1 IN/W/RTP0 3,
P64/TA2 OUT/V/RTP1 0,
P65/TA2 IN/U/RTP1 1
[Inside dotted-line included]
P20/TA4 OUT, P22/TA9 OUT
Operation mode
Line 8
Page 63,
Operation mode
Last line
Page 69,
Lines 6, 7
Page 70,
Fig. 76
The block diagram for port P6 pins (the 3rd block diagram) is added.
Page 72,
Fig. 79
Page 73,
Fig. 78
Comparison result register 0 (DE16)•••
Debug control register 1 (8116)•••
0
0016
0 0 (Note 2) 0 0 0 (Note 2)
Comparator result register 0 (DE16)•••
Debug control register 1 (8116)•••
0
0016
0 0
0 0 0 (Note 2)
Page 74,
Left column
Lines 2 to 6
••• and Figure 81 shows a circuit example with an external
ceramic resonator or quartz crystal oscillator. The constants such as capacitance etc. depend on a resonator/
oscillator.
••• and Figure 81 shows a circuit example with an external
ceramic resonator or quartz-crystal oscillator. The constants such as capacitance etc. depend on an oscillator.
Page 74,
Left column
Line 22
Page 74,
Fig. 81
••• enable bit (bit 1 of the clock control register; See
Figure 85.), •••
••• enable bit (bit 1 of the clock control register 0; See
Figure 85.), •••
Fig. 81 Circuit example with external ceramic resonator
or quartz crystal oscillator
Fig. 81 Circuit example with external ceramic resonator
or quartz-crystal oscillator
Fig. 83 Circuit example with pin VCONT and PLL circuit
Fig. 83 Circuit example of connection with pin V CONT
when PLL circuit used
Page 74,
Fig. 83
Page 75,
Left column
Lines 7, 27
Right column
••• the clock control register ••••
••• the clock control register 0 ••••
Lines 15, 10, 21
(4/7)
Corrections and Supplementary Explanation for M37906MxX Datasheet (Rev.C) No.5
Page
Page 75,
Left column
Line 20
Error
Correction
••• selects the PLL circuit’s operation (stopped/active).
Page 75, ••• (In this case, the PLL circuit operates.)
Left column
Line 23
Page 75, At the STP instruction execution, the PLL circuit stops its
Left column operation, and ••••
Line 25
Page 75, ••• the frequency of the PLL output clock (fPLL) •••
Right column
Lines 1, 7, 12
Page 75,
•••, and fXIN is select as the system clock when bit 5 = “0”.
Right column
Line 11
Page 75, •••, and these bits select the multiplication ratio of (f 1 to
Right column f4096)/(fsys).
Line 22
Page 75, Note: The PLL multiplication must be set so that the freTable 9
quency of the PLL output clock (fPLL) must be •••
Note
Page 76,
PLL frequency fPLL
Fig. 84
multiplier
Page 77,
Fig. 86
5
4
0
0
3
2
1
0
Particular function select register 0
•••••••••
At the STP instruction execution, the PLL circuit is active,
and ••••
••• the frequency of fPLL •••
•••, and input clock fXIN is select as the system clock
when bit 5 = “0”.
•••, and these bits select the division ratio of (f1 to
f4096)/(fsys).
Note: The PLL multiplication must be set so that the frequency of fPLL must be •••
PLL frequency fPLL
multiplier
5
4
0
0
3
2
1
System clock
select bit
0
Particular function select register 0
External clock input select bit (Note)
0: Oscillation circuit is active. (The oscillator is connected.)
•••••••••
1: Oscillation circuit is inactive. (External
clock is input.)
•••••••••
Page 78,
Right column
Lines 2, 3
Page 78,
Right column
Lines 5, 6
Page 78,
Right column
Line 13
••• (In this case, the PLL circuit is active.)
System clock
frequency select bit
External clock input select bit (Note)
0: Oscillation circuit is active. (Oscillator
is connected.)
Page 78,
Left column
Lines 4, 5
Page 78,
Left column
Line 12
Page 78,
Left column
After line 29
••• selects the PLL circuit’s operation (inactive/active).
1: Oscillation circuit is inactive. (The
externally-generated clock is input.)
•••••••••
These modes are used to save the power dissipation of
the system, by stopping oscillation or system clock in the
case that the CPU needs not be operating.
These modes are used to save the power dissipation of
the system, by making oscillation or system clock inactive
in the case that the CPU needs not be active.
The interrupt priority level of this interrupt is required to
be higher than the •••
The interrupt priority level of this interrupt needs to be
higher than the •••
Table 11 explains the microcomputer’s operation in the
STP and WIT modes.
The external bus fixation function can also be provided.
This function enables the user to specify the states of the
external bus and the bus control signals in the memory
expansion and the microprocessor mode in the STP or
WIT mode. For more information, refer to the section on
the power saving function.
Table 11 explains the microcomputer’s operation in the
STP and WIT modes.
The execution of the STP instruction stops the oscillation
circuit and PLL circuit. It also stops input clock fX IN,
system clock fsys, •••
The execution of the STP instruction makes the oscillation
circuit and PLL circuit inactive. It also makes the following
inactive: input clock fX IN, system clock fsys, •••
•••, Wf32, and Wf 512 in the “L” state, and divide clocks fX 16
to fX128 in the “H” state.
•••, Wf32, and Wf 512 with the “L” state, and divide clocks
fX16 to fX128 with the “H” state.
At this time, timers A and B operate only in the event
counter mode, •••
At this time, timers A and B can be active only in the
event counter mode, •••
(5/7)
Corrections and Supplementary Explanation for M37906MxX Datasheet (Rev.C) No.6
Page
Error
Page 78,
Table 11
Correction
Stopped
Inactive
Notes 1: ••••, the oscillation circuit stops. Also, clock input
from pin XIN available.
2: ••••, the PLL circuit stops.
Page 79, •••• (bit 5 of the clock control register) = “1”, ••••
Left column
Line 3
Page 79, ••• after the oscillation circuit has been restarted ••••
Left column
Line 10
Page 79,
Fig. 87
5
4
0
3
2
0
1
0
Page 80,
Left column
Line 26
Page 81,
Left column
Line 4
Page 81,
Left column
Line 6
Page 81,
Left column
Line 8
Page 81,
Left column
Line 11
Page 81,
Left column
Line 12
•••• (bit 5 of the clock control register 0) = “1”, ••••
••• after the oscillation circuit and PLL circuit have been
restarted ••••
5
4
0
Particular function register 1
3
2
0
1
0
Particular function register 1
STP-instruction-execution status bit (Note 1)
0: Normal operation.
1: STP instruction has been executed.
STP-instruction-execution status bit (Note 1)
0: Normal operation.
1: STP instruction is under execution.
WIT-instruction-execution status bit (Note 1)
0: Normal operation.
1: WIT instruction has been executed.
WIT-instruction-execution status bit (Note 1)
0: Normal operation.
1: WIT instruction is under execution.
System clock stop select bit at WIT (Note 2)
0: In wait mode, system clocl fsys is active.
1: In wait mode, system clock f sys is stopped.
System clock stop select bit at WIT (Note 2)
0: In wait mode, system clocl fsys is active.
1: In wait mode, system clock f sys is inactive.
Notes 1: •••• Even when “1” is written, the bit status will
not change.
Page 80,
Left column
Line 5
Page 80,
Left column
Lines 6, 7
Page 80,
Left column
Lines 9, 10
Page 80,
Left column
Lines 13, 14
Page 80,
Left column
Lines 16, 17
Page 80,
Left column
Line 21
Notes 1: ••••, the oscillation circuit is inactive. Also, clock
input from pin XIN is allowed.
2: ••••, the PLL circuit is inactive.
••••, and divide clocks Wf 32 and Wf512 are stopped in the
“L” state.
••••, and peripheral devices’ clock f1 to f4096 remain
operating. Therefore, BIU and CPU are stopped, ••••
Notes 1: •••• Even when “1” is try to be written, the bit
status will not change.
••••, and divide clocks Wf 32 and Wf512 are inactive with the
“L” state.
••••, and peripheral devices’ clocks f1 to f4096 remain
active. Therefore, BIU and CPU are inactive, ••••
••••, which use the peripheral devices’ clocks f 1 to f4096,
••••, which use the peripheral devices’ clocks f 1 to f4096,
are still operating. Note that the watchdog timer is stopped. are still active. Note that the watchdog timer is inactive.
••••, and input clock fXIN are operating, while system clock
fsys, φBIU, φCPU, and peripheral devices’ clocks stop
operating.
••••, and input clock fXIN are active, while system clock
fsys, φBIU, φCPU, and peripheral devices’ clocks are inactive.
••••, Wf 32 and Wf 512, are stopped. At this time, timers A
and B operate only in the event counter mode, ••••
••••, Wf 32 and Wf 512, become inactive. At this time, timers
A and B are active only in the event counter mode, ••••
•••• the system clocks stop select bit at WIT is to be set to
“1” ••••
•••• the system clocks stop select bit at WIT needs to be
set to “1” ••••
••••, and clock input fXIN are operating in the WIT mode,
••••
••••, and clock input fXIN are active in the WIT mode, ••••
(1) Stop of system clock in wait mode
(1) Inactive system clock in wait mode
••••, if the internal peripheral devices need not to operate,
the system clock stop select bit ••••
••••, if the internal peripheral devices need not to operate,
when the system clock stop select bit ••••
•••• and peripheral devices’ clock stop their operations,
and ••••
•••• and peripheral devices’ clock are inactive, and ••••
(2) Stop of oscillation circuit
(2) Inactive oscillation circuit
When an externally-generated-stable clock is input to pin
XIN, ••••
When an externally-generated stable clock is input to pin
XIN, ••••
(6/7)
Corrections and Supplementary Explanation for M37906MxX Datasheet (Rev.C) No.7
Page
Error
Correction
Page 81,
• the oscillation driver between pins XIN and XOUT stops
Left column its operation.
Line 17
Page 81, When not using a PLL output clocks, also, the supply of
Left column φBIU and φCPU restarts their operations just after the
Line 18 microcomputers returns from the stop mode, ••••
Page 81,
••••, be sure that a wating time of 1 µs more has passed
Left column ••••
Line 31
Page 84,
ABSOLUTE
MAXIMUM
RATINGS
Symbol
VRAM
Page 84,
RECOMMENDED
OPERATING
CONDITIONS
Parameter
• the oscillation driver circuit between pins X IN and XOUT
is inactive.
When not using fPLL, also, the supply of φBIU and φCPU
restarts just after the microcomputer returns from the stop
mode, ••••
••••, be sure that a wating time or 1 µs more has passed
••••
Symbol
VRAM
Storage temerature
Parameter
Storage temperature
2: Average output current is the average value of an
interval of 100 ms.
2: The average output current is the average value of an
interval of 100 ms.
(VCC = 5V, ••••, f(fsys) = 20 MHz)
(VCC = 5V, ••••, f(fsys) = 20 MHz, unless otherwise noted)
Page 85,
DC ERECTRICAL
CHARACTERISTICS
Item 1
Item 2
Symbol
Test conditions
Symbol
VRAM
When clock is stopped.
VRAM
ICC
Output-only
•••••••••••••••••
•••••••••••••••••
The PLL frequ-
ICC
f(fsys) = 20 MHz
CPU operates.
Ta = 25°C when
clock is stopped.
ency multiplier
stops its opera- Ta = 85°C when
clock is stopped.
tion.
Test conditions
When clock is inactive.
f(fsys) = 20 MHz
Output-only
••••••••••••••••• CPU is active.
••••••••••••••••• Ta = 25°C when
The PLL frequ- clock is inactive.
ency multiplier
is inactive.
Ta = 85°C when
clock is inactive.
Page 91,
External clock
input; Timing
Requirements
Pages 91 to 98
Pages 99, 100
Last page
Symbol
Parameter
Symbol
Parameter
tw(half)
External clock input pulse
width with half input-volage
tw(half)
External clock input pulse
width with half input-voltage
MASK ROM ORDER CONFIRMATION FORM
• M37906M4C-XXXFP/SP
• M37906M6C-XXXFP/SP
• M37906M8C-XXXFP/SP
(Deleted)
MARK SPECIFICATION FORM
• 42P2R-E
• 42P4B
(Deleted)
Cotents of Notes (Before revision)
Cotents of Notes (After revision)
(7/7)