HOLTEK HT49RV3

HT49RV3/HT49CV3
VFD Type 8-Bit MCU
Technical Document
· Tools Information
· FAQs
· Application Note
- HA0077E HT49CVX Remote Control Receiver SWIP Design Note
- HA0078E HT49CVX Display SWIP Design Note
Features
· Operating voltage:
· Real Time Clock (RTC)
fSYS=4MHz: 2.2V~5.5V
fSYS=8MHz: 3.3V~5.5V
· 8-bit prescaler for RTC
· Watchdog Timer
· 17 bidirectional I/O lines (PA, PB, PC, PD)
· Buzzer output
· Two external interrupt inputs
· On-chip crystal, RC and 32768Hz crystal oscillator
· Two 16-bit programmable timer/event counters with
· HALT function and wake-up feature reduce power
PFD (programmable frequency divider) function
consumption
· One 8-bit Remote Control Timer (RMT), pin-shared
· 6-level subroutine nesting
with PC7
· Low voltage reset function
· Single channel serial interface
· Bit manipulation instruction
· VFD driver with 11´11 segments
· 16-bit table read instruction
(16-segment & 4-grid to 11-segment & 11-grid)
· Up to 0.5ms instruction cycle with 8MHz system clock
· 2K´16 program memory
· 63 powerful instructions
· 96´8 data memory RAM
· All instructions in 1 or 2 machine cycles
· Supports PFD for sound generation
· 52-pin QFP package
General Description
driver they are suitable for use in products which require
a front panel for their operation such as DVDs, VCDs,
mini-component audio systems, cassette decks, tuners,
CD players, other home appliances, etc.
The HT49RV3/HT49CV3 are 8-bit high performance
single chip MCUs. Their single cycle instruction and
2-stage pipeline architecture make them suitable for
high speed applications. As the devices include an VFD
Rev. 1.30
1
March 20, 2007
HT49RV3/HT49CV3
Block Diagram
In te rru p t
C ir c u it
M
T M R 1 C
T M R 1
P F D 1
IN T C
M
M P
U
X
U
fS
X
U
X
M
fS
U
X
P D
P D
P D
P D
P O R T D
P D
P B C
B P
S
D
A C C
V F D
M e m o ry
P A C
S E G 1 1 /G r id 1 0 ~
S E G 1 5 /G r id 6
4 /IN
5 /IN
6 /T
7 /T
P A 0
P A 1
P A 2
P A 3
P A 4
P O R T A
E N /D IS
H A L T
G r id 0 ~
G r id 5
/4
O S C
O S C 3
O S C 4
T 0
T 1
M R 0
M R 1
P B 0 ~ P B 3
P A
V F D D r iv e r
V E E
P O R T B
P B
S
Y S
R T C
S h ifte r
C 1
C 3
/4
W D T O S C
S T A T U S
A L U
Y S
3 2 7 6 8 H z
D a ta
M e m o ry
P D C
T im in g
G e n e r a tio n
Y S
P D 6 /T M R 0
M U X
In s tr u c tio n
D e c o d e r
fS
P D 7 /T M R 1
M
W D T
O S
O S
V D
V S
R E
X
R T C
In s tr u c tio n
R e g is te r
O S C 2
O S C 4
U
P F D 0
S ta c k
P ro g ra m
C o u n te r
P ro g ra m
R O M
P r e s c a le r
M
T M R 0 C
T M R 0
/B Z
/B Z
/P F D
~ P A 7
L V R
S E G 0 ~
S E G 1 0
P C C
P O R T C
P C 7 /R M T
P C
S D I
S D O
S C K
S e r ia l In te r fa c e
S C S
M U X
fS
fR
8 - b it R e m o te
C o n tr o l T im e r
Rev. 1.30
2
Y S /4
T C O S C
R M T
March 20, 2007
HT49RV3/HT49CV3
Pin Assignment
G
G
G
G
G
G
R ID 5
R ID 4
R ID 3
R ID 2
R ID 1
R ID 0
S C S
S C K
S D O
S D I
O S C 4
O S C 3
V D D
O S C
O S C
R E
P A 0 /B
P A 1 /B
P A
P A 3 /P F
P A
P A
P A
P A
P B
P B
5 2 5 1 5 0 4 9 4 8 4 7 4 6 4 5 4 4 4 3 4 2 4 1 4 0
2
1
1
D
S
Z
3 8
3
3 7
3 6
4
Z
5
3 5
2
6
H T 4 9 R V 3 /H T 4 9 C V 3
5 2 Q F P -A
7
4
8
5
9
6
1 0
7
1 1
0
1 2
1
3 9
2
1 3
1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 2 4 2 5 2 6
3 4
3 3
3 2
3 1
3 0
2 9
2 8
2 7
V D
V E
S E
S E
S E
S E
S E
S E
S E
S E
S E
S E
S E
E
D
G 1 5
G 1 4
G 1 3
G 1 2
G 1 1
G 1 0
G 9
G 8
G 7
G 6
G 5
/G R
/G R
/G R
/G R
/G R
ID 6
ID 7
ID 8
ID 9
ID 1 0
S E
S E
S E
S E
S E
P C
V S
P D
P D
P D
P D
P B
P B
G 4
G 3
G 2
G 1
G 0
7 /R M T
S
2
3
7 /T
6 /T
5 /IN
4 /IN
M R 1
M R 0
T 1
T 0
Note: Each VDD (VSS) pins must be connected to the power (ground) of the system.
Pin Description
Pin Name
I/O
Options
Description
PA0/BZ
PA1/BZ
PA2
PA3/PFD
PA4~PA7
I/O
Wake-up
Pull-high
Buzzer
PFD
Bidirectional 8-bit input/output port. Each bit can be configured as a wake-up
input by configuration option. Software instructions determine if the pin is a
CMOS output or Schmitt trigger input with or without pull-high resistor (determined by pull-high option: bit option). Pins PA0, PA1 and PA3 are pin-shared
with BZ, BZ and PFD, respectively.
PB0~PB3
I/O
Pull-high
Bidirectional 4-bit input/output port. Software instructions determine if the pin
is a CMOS output or Schmitt trigger input with or without pull-high resistor
(determined by pull-high option: bit option).
PC7/RMT
I/O
Pull-high
Bidirectional 1-bit input/output port. Software instructions determine if the pin
is a CMOS output or Schmitt trigger input with or without pull-high resistor
(determined by pull-high option: bit option). RMT with wake-up function (both
rising and falling edge) and Schmitt trigger input with or without a pull-high resistor (determined by pull-high option).
Note: The RMT is pin-shared with PC7. When this pin is used as an RMT input, the pin should be setup as an input, to prevent the I/O pin influencing the
operation of the RMT.
Bidirectional 4-bit input/output port. Software instructions determine if the pin
is a CMOS output or Schmitt trigger input with or without pull-high resistor
(determined by pull-high option: bit option). Pins PD4~PD7 are pin-shared
with INT0, INT1, TMR0 & TMR1, respectively (determined by software control).
PD4/INT0
PD5/INT1
PD6/TMR0
PD7/TMR1
I/O
Pull-high
VSS
¾
¾
Negative power supply, ground
VEE
¾
¾
VFD Negative power supply
SEG0~SEG10
O
¾
High voltage segment output for VFD panel.
SEG11/Grid10~
SEG15/Grid6
O
¾
High voltage output for VFD panel. These pins are selectable for segment or
grid output.
Grid0~Grid5
O
¾
High voltage grid output for VFD panel.
SDI
I
¾
Serial interface serial data input
Rev. 1.30
3
March 20, 2007
HT49RV3/HT49CV3
Pin Name
I/O
Options
Description
SDO
O
¾
Serial interface serial data output
SCK
I/O
¾
Serial interface serial clock input/output (initial ²input²).
SCS
I/O
¾
Serial interface chip select pin, output for master mode, input for slave mode.
OSC4
OSC3
O
I
VDD
¾
OSC2
OSC1
O
I
RES
I
Real time clock oscillators. OSC3 and OSC4 are connected to a 32768Hz
RTC or
crystal oscillator for timing purposes or to a system clock source (depending
System Clock
on the options). No built-in capacitor.
¾
Positive power supply
OSC1 and OSC2 are connected to an RC network or a crystal (by options) for
the internal system clock. For RC operation, OSC2 is an output pin for 1/4
Crystal or RC
system clock. The system clock may come from the RTC oscillator. If the system clock comes from RTCOSC, these two pins can be left floating.
¾
Schmitt trigger reset input, active low
Absolute Maximum Ratings
Supply Voltage ...........................VSS-0.3V to VSS+6.0V
Storage Temperature ............................-50°C to 125°C
Input Voltage..............................VSS-0.3V to VDD+0.3V
IOL Total ..............................................................150mA
Total Power Dissipation .....................................500mW
Operating Temperature...........................-40°C to 85°C
IOH Total............................................................-100mA
Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum Ratings² may
cause substantial damage to the device. Functional operation of this device at other conditions beyond those
listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability.
D.C. Characteristics
Symbol
VDD
Parameter
Operating Voltage
VEE
VFD Supply Voltage
IDD1
Operating Current (Crystal OSC)
Ta=25°C
Test Conditions
VDD
IDD4
5.5
V
¾
fSYS=8MHz
3.3
¾
5.5
V
0
¾
VDD-30
V
No load, VFD off,
fSYS=4MHz
¾
2.0
3.0
mA
¾
5.0
8.0
mA
No load, VFD off,
fSYS=4MHz
¾
1.8
2.7
mA
¾
4.6
7.5
mA
¾
3V
Operating Current (RC OSC)
¾
1.2
2
mA
¾
4
7
mA
3V
¾
3.5
4.5
mA
¾
7.5
12
mA
¾
¾
1
mA
¾
¾
2
mA
¾
4
10
mA
¾
14
20
mA
0
¾
0.2VDD
V
3V
No load, VFD off
3V
5V
ISTB2
VIL1
Rev. 1.30
Standby Current
(*fS=32768Hz OSC)
Input Low Voltage for I/O Ports,
TMR and INT
¾
5V
Operating Current (Crystal OSC)
Standby Current (*fS=T1)
Unit
¾
5V
ISTB1
Max.
2.2
3V
Operating Current
(fSYS=32768Hz)
Typ.
fSYS=4MHz
5V
IDD3
Min.
¾
5V
IDD2
Conditions
3V
5V
No load, VFD on,
fSYS=4MHz
No load, system HALT
VFD off at HALT
No load, system HALT
VFD off at HALT
3V
¾
5V
4
March 20, 2007
HT49RV3/HT49CV3
Symbol
Parameter
VIH1
Input High Voltage for I/O Ports,
TMR and INT
VIL2
Input Low Voltage (RES)
VIH2
Input High Voltage (RES)
IOL
I/O Port Sink Current
Test Conditions
VDD
3V
5V
3V
5V
3V
5V
3V
Min.
Typ.
Max.
Unit
¾
0.8VDD
¾
VDD
V
¾
0
¾
0.4VDD
V
¾
0.9VDD
¾
VDD
V
6
12
¾
mA
10
25
¾
mA
-2
-4
¾
mA
-5
-8
¾
mA
Conditions
VOL=0.1VDD
5V
3V
VOH=0.9VDD
IOH1
I/O Port Source Current
IOH2
Grid Source Current
5V
VOH=VDD-2V
-15
¾
¾
mA
IOH3
Segment Source Current
5V
VOH=VDD-2V
-3
¾
¾
mA
RPH
Pull-high Resistance of I/O Ports
and INT0, INT1
3V
¾
20
60
100
kW
5V
¾
10
30
50
kW
¾
50
100
150
kW
2.7
3.0
3.3
V
5V
RPL
VFD Driver Output Pull-low
Resistor
5V
VLVR
Low Voltage Reset Voltage
¾
LVR enabled
Note: ²*fS² Refer to WDT clock option
A.C. Characteristics
Ta=25°C
Test Conditions
Symbol
Parameter
fSYS1
System Clock
Typ.
Max.
Unit
¾
2.2V~5.5V
400
¾
4000
kHz
¾
3.3V~5.5V
400
¾
8000
kHz
2.2V~5.5V
¾
32768
¾
Hz
¾
32768
¾
Hz
fSYS2
System Clock
(32768Hz Crystal OSC)
¾
fRTCOSC
RTC Frequency
¾
fTIMER
Timer I/P Frequency
(TMR0/TMR1)
tWDTOSC Watchdog Oscillator Period
Min.
Conditions
VDD
¾
¾
2.2V~5.5V
0
¾
4000
kHz
¾
3.3V~5.5V
0
¾
8000
kHz
3V
¾
45
90
180
ms
5V
¾
32
65
130
ms
tRES
External Reset Low Pulse Width
¾
¾
1
¾
¾
ms
tSST
System Start-up Timer Period
¾
Power-up or wake-up from
HALT
¾
1024
¾
tSYS
tINT
Interrupt Pulse Width
¾
¾
1
¾
¾
ms
Note: tSYS= 1/fSYS
Rev. 1.30
5
March 20, 2007
HT49RV3/HT49CV3
Functional Description
Execution Flow
executed and its contents specify a maximum of 2048
addresses.
The system clock is derived from either a crystal or an
RC oscillator or a 32768Hz crystal oscillator. It is internally divided into four non-overlapping clocks. One instruction cycle consists of four system clock cycles.
After accessing a program memory word to fetch an instruction code, the contents of the program counter are
incremented by one. The program counter then points to
the memory word containing the next instruction code.
Instruction fetching and execution are pipelined in such
a way that a fetch takes one instruction cycle while decoding and execution takes the next instruction cycle.
The pipelining scheme ensures that instructions are effectively executed in one cycle. Exceptions to this are instructions that change the contents of the program
counter, such as subroutine calls or jumps, in which
case, two cycles are required to complete the instruction.
When executing a jump instruction, conditional skip execution, loading PCL register, subroutine call, initial reset, internal interrupt, external interrupt or return from
subroutine, etc., the microcontroller manages program
control by loading the address corresponding to each instruction.
For conditional skip instructions, once the condition has
been met, the next instruction, which has already been
fetched during the current instruction execution, is discarded and a dummy cycle replaces it while the proper
instruction is obtained. Otherwise proceed with the next
instruction.
Program Counter - PC
The 11-bit program counter (PC) controls the sequence
in which the instructions stored in the program ROM are
S y s te m
O S C 2 (R C
C lo c k
T 1
T 2
T 3
T 4
T 1
T 2
T 3
T 4
T 1
T 2
T 3
T 4
o n ly )
P C
P C
P C + 1
F e tc h IN S T (P C )
E x e c u te IN S T (P C -1 )
P C + 2
F e tc h IN S T (P C + 1 )
E x e c u te IN S T (P C )
F e tc h IN S T (P C + 2 )
E x e c u te IN S T (P C + 1 )
Execution Flow
Mode
Program Counter
*10
*9
*8
*7
*6
*5
*4
*3
*2
*1
*0
Initial Reset
0
0
0
0
0
0
0
0
0
0
0
External Interrupt 0
0
0
0
0
0
0
0
0
1
0
0
External Interrupt 1
0
0
0
0
0
0
0
1
0
0
0
Timer/Event Counter 0 Overflow
0
0
0
0
0
0
0
1
1
0
0
Timer/Event Counter 1 Overflow
0
0
0
0
0
0
1
0
0
0
0
Serial Interface Interrupt
0
0
0
0
0
0
1
0
1
0
0
Multi-function Interrupt
0
0
0
0
0
0
1
1
0
0
0
Loading PCL
*10
*9
*8
@7
@6
@5
@4
@3
@2
@1
@0
Jump, Call Branch
#10
#9
#8
#7
#6
#5
#4
#3
#2
#1
#0
Return from Subroutine
S10
S9
S8
S7
S6
S5
S4
S3
S2
S1
S0
Skip
Program Counter+2
Program Counter
Note:
*10~*0: Program counter bits
#10~#0: Instruction code bits
Rev. 1.30
S10~S0: Stack register bits
@7~@0: PCL bits
6
March 20, 2007
HT49RV3/HT49CV3
· Location 008H
The lower byte of the program counter (PCL) is available for program control and is a readable and writeable
register (06H). Moving data into the PCL performs a
short jump. The destination will be within 256 locations.
This area is reserved for the external interrupt service
program. If the INT1 input pin is activated, and the interrupt is enabled, and the stack is not full, the program will jump to this location and begin execution.
When a control transfer takes place, an additional
dummy cycle is required.
· Location 00CH
This area is reserved for the Timer/Event Counter 0 interrupt service program. If a timer interrupt results
from a Timer/Event Counter 0 overflow, and if the interrupt is enabled and the stack is not full, the program
will jump to this location and begin execution.
Program Memory - EPROM
The program memory (EPROM) is used to store the program instructions which are to be executed. It also contains data, table, and interrupt entries, and is organized
into 2048´16 bits format. The program counter is composed of 11 bits, so it can directly access the whole program memory without changing banks.
· Location 010H
This area is reserved for the Timer/Event Counter 1 interrupt service program. If a timer interrupt results
from a Timer/Event Counter 1 overflow, and if the interrupt is enabled and the stack is not full, the program
will jump to this location and begin execution.
Certain locations in the ROM are reserved for special
usage:
· Location 014H
· Location 000H
This area is reserved for the Serial Interface interrupt
service program. If 8 bits of data have been received or
transmitted successfully from the serial interface, and
the interrupt is enabled, and the stack is not full, the
program will jump to this location and begin execution.
This area is reserved for use by the chip reset for program initialization. After a chip reset is initiated, the
program will jump to this location and begin execution.
· Location 004H
This area is reserved for the external interrupt service
program. If the INT0 input pin is activated, and the interrupt is enabled, and the stack is not full, the program will jump to this location and begin execution.
0 0 0 H
E x te r n a l In te r r u p t 0 S u b r o u tin e
0 0 8 H
0 1 0 H
This area is reserved for the multi-function interrupt. If
a real time clock interrupt occurs, or if a rising edge is
detected from the RMT input pin, or if a falling edge is
detected from the RMT input pin, or if the RMT overflow and the related interrupts are enabled, and the
stack is not full, the program will jump to this location
and begin execution.
D e v ic e In itia liz a tio n P r o g r a m
0 0 4 H
0 0 C H
· Location 018H
E x te r n a l In te r r u p t 1 S u b r o u tin e
· Table location
T im e r /E v e n t C o u n te r 0 In te r r u p t S u b r o u tin e
T im e r /E v e n t C o u n te r 1 In te r r u p t S u b r o u tin e
0 1 4 H
P ro g ra m
R O M
S e r ia l In te r fa c e In te r r u p t
0 1 8 H
Any location within the program memory can be used
as a look-up table where programmers can store fixed
data. The instructions ²TABRDC [m]² (the current
page, 1 page=256 words) and ²TABRDL [m]² (the last
page) transfer the contents of the lower-order byte to
the specified data memory, and the contents of the
higher-order byte to TBLH (Table Higher-order byte
register) (08H). Only the destination of the lower-order
byte in the table is well-defined, the other bits of the table word are all transferred to the lower portion of
TBLH. The TBLH is a read only register and the table
pointer (TBLP) is a read/write register (07H), which indicates the table location. Before accessing the table,
the location must be placed in the TBLP. All table related instructions require two cycles to complete the
operation. These areas may function as normal program memory depending upon user¢s requirements.
M u lti- fu n c tio n In te r r u p t
n 0 0 H
L o o k - u p T a b le ( 2 5 6 W o r d s )
n F F H
L o o k - u p T a b le ( 2 5 6 W o r d s )
7 F F H
1 6 b its
N o te : n ra n g e s fro m
0 to 7
Program Memory
Instruction(s)
Table Location
*10
*9
*8
*7
*6
*5
*4
*3
*2
*1
*0
TABRDC [m]
P10
P9
P8
@7
@6
@5
@4
@3
@2
@1
@0
TABRDL [m]
1
1
1
@7
@6
@5
@4
@3
@2
@1
@0
Table Location
Note:
*10~*0: Table location bits
@7~@0: Table pointer bits
Rev. 1.30
P10~P8: Current program counter bits
7
March 20, 2007
HT49RV3/HT49CV3
In d ir e c t A d d r e s s in g R e g is te r 0
Stack Register - STACK
0 0 H
The stack register is a special part of the memory used
to save the contents of the Program Counter. The stack
is organized into 6 levels and is neither part of the data
nor part of the program, and is neither readable nor
writeable. Its activated level is indexed by a stack
pointer (SP) and is neither readable nor writeable. At the
start of a subroutine call or an interrupt acknowledgment, the contents of the Program Counter is pushed
onto the stack. At the end of the subroutine or interrupt
routine, signaled by a return instruction (RET or RETI),
the contents of the Program Counter is restored to its
previous value from the stack. After a chip reset, the SP
will point to the top of the stack.
0 1 H
M P 0
0 2 H
In d ir e c t A d d r e s s in g R e g is te r 1
0 3 H
M P 1
If the stack is full and a non-masked interrupt takes
place, the interrupt request flag is recorded but the acknowledgment is still inhibited. Once the SP is decremented (by RET or RETI), the interrupt is serviced. This
feature prevents stack overflow, allowing the programmer to use the structure easily. Likewise, if the stack is
full, and a ²CALL² is subsequently executed, a stack
overflow occurs and the first entry is lost (only the most
recent 6 return addresses are stored).
Data Memory - RAM
The data memory (RAM) has a capacity of 130´8 bits,
and is divided into two functional groups, namely; special function registers (34´8 bit) and general purpose
data memory (RAM bank contains 96´8 bits) most of
which are readable/writeable, but some are read only.
The special function registers are overlapped in any
banks.
The special function registers consist of an Indirect addressing register 0 (00H), a Memory pointer register 0
(MP0;01H), an Indirect addressing register 1 (02H), a
Memory pointer register 1 (MP1;03H), a Bank pointer
(BP;04H), an Accumulator (ACC;05H), a Program counter lower-order byte register (PCL;06H), a Table pointer
(TBLP;07H), a Table higher-order byte register
(TBLH;08H), a Real time clock control register
(RTCC;09H), a Status register (STATUS;0AH), an Interrupt control register 0 (INTC0;0BH), a Timer/Event
Counter 0 (TMR0H:0CH; TMR0L:0DH), a Timer/Event
Counter 0 control register (TMR0C;0EH), a Timer/Event
Counter 1 (TMR1H:0FH;TMR1L:10H), a Timer/Event
Counter 1 control register (TMR1C; 11H), Interrupt control register 1 (INTC1;1EH), Serial Bus control register
(SBCR;1FH), Serial Bus data register (SBDR; 20H), Remote timer control register (RMTC;21H), Remote control capture register 0 (RMT0;22H), Remote control
capture register 1 (RMT1;23H), Multi-function interrupt
Status register (MFIS;29H), VFD control register
(VFDC; 28H), I/O registers (PA;12H, PB;14H, PC;16H,
PD;18H) and I/O control registers (PAC;13H, PBC;15H,
PCC;17H, PDC;19H).
Rev. 1.30
0 4 H
B P
0 5 H
A C C
0 6 H
P C L
0 7 H
T B L P
0 8 H
T B L H
0 9 H
R T C C
0 A H
S T A T U S
0 B H
IN T C 0
0 C H
T M R 0 H
0 D H
T M R 0 L
0 E H
T M R 0 C
0 F H
T M R 1 H
1 0 H
T M R 1 L
1 1 H
T M R 1 C
1 2 H
P A
1 3 H
P A C
1 4 H
P B
1 5 H
P B C
1 6 H
P C
1 7 H
P C C
1 8 H
P D
1 9 H
P D C
1 A H
P W M 0
1 B H
P W M 1
1 C H
P W M 2
1 D H
P W M 3
1 E H
IN T C 1
1 F H
S B C R
2 0 H
S B D R
2 1 H
R M T C
2 2 H
R M T 0
2 3 H
R M T 1
S p e c ia l P u r p o s e
D a ta M e m o ry
2 4 H
2 5 H
A D R
2 6 H
A D C R
2 7 H
A C S R
2 8 H
V F D C
2 9 H
M F IS
3 0 H
3 F H
4 0 H
9 F H
G e n e ra l P u rp o s e
D a ta M e m o ry
(9 6 B y te s )
: U n u s e d
R e a d a s "0 0 "
RAM Mapping
The remaining space before 40H is reserved for future
expansion usage and reading these locations will return
the result ²00H². The space before 40H overlaps in
each bank. The general-purpose data memory, addressed from 40H to 9FH, is used for data and control
information under instruction commands.
8
March 20, 2007
HT49RV3/HT49CV3
All data memory areas can handle arithmetic, logic, increment, decrement and rotate operations directly. Except for some dedicated bits, each bit in the data
memory can be set and reset by ²SET [m].i² and ²CLR
[m].i². They are also indirectly accessible through memory pointer registers (MP0;01H/MP1;03H).
The ALU not only saves the results of a data operation
but also changes the status register.
Status Register - STATUS
The status register (0AH) is 8 bits wide and contains a
carry flag (C), an auxiliary carry flag (AC), a zero flag (Z),
an overflow flag (OV), a power down flag (PDF), and a
watchdog time-out flag (TO). It also records the status
information and controls the operation sequence.
Indirect Addressing Register
Location 00H and 02H are indirect addressing registers
that are not physically implemented. Any read/write operation of [00H] and [02H] accesses the RAM pointed to
by MP0 (01H) and MP1(03H), respectively. Reading location 00H or 02H indirectly returns the result 00H. Writing indirectly leads to no operation.
Except for the TO and PDF flags, bits in the status register can be altered by instructions similar to other registers. Data written into the status register does not alter
the TO or PDF flags. Operations related to the status
register, however, may yield different results from those
intended. The TO and PDF flags can only be changed
by a Watchdog Timer overflow, chip power-up, or clearing the Watchdog Timer and executing a ²HALT² instruction. The Z, OV, AC, and C flags reflect the status of
the latest operations.
The function of data movement between two indirect addressing registers is not supported. The memory pointer
registers, MP0 and MP1, are both 8-bit registers used to
access the RAM by combining corresponding indirect
addressing registers. MP0 can only be applied to data
memory, while MP1 can be applied to data memory and
VFD display memory.
On entering an interrupt sequence or executing a subroutine call, the status register will not be automatically
pushed onto the stack. If the contents of the status is important, and if the subroutine is likely to corrupt the status register, the programmer should take precautions
and save it properly.
Accumulator - ACC
The Accumulator (ACC) is closely related with operations carried out by the ALU. It is mapped to location
05H of the RAM and is capable of operating with immediate data. The data movement between two data memory locations must pass through the ACC.
Interrupts
The HT49RV3/HT49CV3 provides two external interrupts, two internal timer/event counter interrupts, three
remote control timer interrupts, an internal real time
clock interrupt and serial interface interrupt. The
Interrupt Control Register 0 (INTC0;0BH) and Interrupt
Control Register 1 (INTC1;1EH) both contain the interrupt control bits that are used to set the enable/disable
status and interrupt request flags.
Arithmetic and Logic Unit - ALU
This circuit performs 8-bit arithmetic and logic operations and provides the following functions:
· Arithmetic operations (ADD, ADC, SUB, SBC, DAA)
· Logic operations (AND, OR, XOR, CPL)
· Rotation (RL, RR, RLC, RRC)
· Increment and Decrement (INC, DEC)
· Branch decision (SZ, SNZ, SIZ, SDZ etc.)
Bit No.
Label
Function
0
C
C is set if an operation results in a carry during an addition operation or if a borrow does
not take place during a subtraction operation, otherwise C is cleared. C is also affected by
a rotate through carry instruction.
1
AC
AC is set if an operation results in a carry out of the low nibbles in addition or no borrow
from the high nibble into the low nibble in subtraction, otherwise AC is cleared.
2
Z
3
OV
OV is set if an operation results in a carry into the highest-order bit but not a carry out of
the highest-order bit, or vice versa, otherwise OV is cleared.
4
PDF
PDF is cleared by either a system power-up or executing the ²CLR WDT² instruction.
PDF is set by executing the ²HALT² instruction.
5
TO
TO is cleared by a system power-up or executing the ²CLR WDT² or ²HALT² instruction.
TO is set by a WDT time-out.
6~7
¾
Unused bit, read as ²0²
Z is set if the result of an arithmetic or logic operation is zero, otherwise Z is cleared.
Status (0AH) Register
Rev. 1.30
9
March 20, 2007
HT49RV3/HT49CV3
All these interrupts can support a wake-up function. As
an interrupt is serviced, a control transfer occurs by
pushing the contents of the Program Counter onto the
stack followed by a branch to a subroutine at the specified location in the ROM. Only the contents of the Program Counter is pushed onto the stack. If the contents of
the register or of the status register (STATUS) is altered
by the interrupt service program which corrupts the desired control sequence, the contents should be saved in
advance.
Once an interrupt subroutine is serviced, all other interrupts are blocked (by clearing the EMI bit). This scheme
may prevent any further interrupt nesting. Other interrupt requests may take place during this interval, but
only the interrupt request flag will be recorded. If another
interrupt requires servicing while the program is in the
interrupt service routine, the programmer should set the
EMI bit and the corresponding bit of the INTC0 or INTC1
to allow interrupt nesting. Once the stack is full, the interrupt request will not be acknowledged, even if the related
interrupt is enabled, until the SP is decremented. If immediate service is desired, the stack should be prevented
from becoming full.
Bit No.
Label
0
EMI
Controls the master or global interrupt (1=enable; 0=disable)
Function
1
EEI0
Controls the external interrupt 0 (1=enable; 0=disable)
2
EEI1
Controls the external interrupt 1 (1=enable; 0=disable)
3
ET0I
Controls the Timer/Event Counter 0 interrupt (1=enable; 0=disable)
4
EIF0
External interrupt 0 request flag (1=active; 0=inactive)
5
EIF1
External interrupt 1 request flag (1=active; 0=inactive)
6
T0F
7
¾
Internal Timer/Event Counter 0 request flag (1=active; 0=inactive)
Unused bit, read as ²0²
INTC0 (0BH) Register
Bit No.
Label
Function
0
ET1I
Controls the Timer/Event Counter 1 interrupt (1=enable; 0=disable)
1
ESII
Controls the serial interface interrupt (1=enabled; 0:disabled)
2
EMFI
Controls the real multi-function interrupt (1=enable; 0:disable)
3, 7
¾
4
T1F
Unused bit, read as ²0²
Internal Timer/Event Counter 1 request flag (1=active; 0=inactive)
5
SIF
Serial interface data transferred or data received interrupt request flag (1=active; 0=inactive)
6
MFF
Multi-function interrupt request flag (1=active; 0=inactive)
INTC1 (1EH) Register
Bit No.
0
Label
¾
Function
Unused bit, read as ²0²
1
ERMT0 Controls the remote control timer rising edge interrupt (1=enable; 0=disable)
2
ERMT1 Controls the remote control timer falling edge interrupt (1=enable; 0=disable)
3
ERMTV Controls the remote control timer overflow interrupt (1=enable; 0=disable)
Controls the remote control timer (1=enable; 0=disable)
1=enable & start counting; 0= disable & clear counter to 0
4
RME
5
RMCS
Selects the remote control timer clock source fX (1=fSYS; 0=fSYS/4)
6
7
RMS0
RMS1
Selects the remote control timer clock
00=fX/25
01= fX/26
10= fX/27
11= fX/28
RMTC (21H) Register
Rev. 1.30
10
March 20, 2007
HT49RV3/HT49CV3
Bit No.
Label
Function
0
RMTVF
1
RTF
2
RMT0F
Remote control timer rising edge interrupt flag (1=indicates that a rising edge interrupt has occurred; 0=indicates that a rising edge interrupt has not occurred)
3
RMT1F
Remote control timer falling edge interrupt flag (1=indicates that a falling edge interrupt has
occurred; 0=indicates that a falling edge interrupt has not occurred)
4
ERTI
5~7
¾
Remote control timer overflow interrupt flag (1=indicates that an overflow has occurred;
0=indicates that an overflow has not occurred)
Real time clock interrupt flag (1=indicates that an RTC interrupt has occurred;
0=indicates that an RTC interrupt has not occurred)
Controls the real time clock interrupt (1=enable; 0=disable)
Unused bit, read as ²0²
MFIS (29H) Register
related interrupt control bit are both set to 1 (if the stack
is not full). To return from the interrupt subroutine, ²RET²
or ²RETI² may be invoked. RETI sets the EMI bit and enables an interrupt service, but RET does not.
External interrupts are triggered by an edge transition of
INT0 or INT1 (configuration option: high to low, low to
high, low to high or high to low), and the related interrupt
request flag (EIF0; bit 4 of the INTC0, EIF1; bit 5 of the
INTC0) is set as well. After the interrupt is enabled, the
stack is not full, and the external interrupt is active, a
subroutine call to location 04H or 08H occurs. The interrupt request flag (EIF0 or EIF1) and EMI bits are all
cleared to disable other maskable interrupts.
Interrupts occurring in the interval between the rising
edges of two consecutive T2 pulses are serviced on the
latter of the two T2 pulses if the corresponding interrupts
are enabled. In the case of simultaneous requests, the
following table shows the priority that is applied. These
can be masked by resetting the EMI bit.
The internal Timer/Event Counter 0 interrupt is initialized by setting the Timer/Event Counter 0 interrupt request flag (T0F; bit 6 of the INTC0), which is normally
caused by a timer overflow. After the interrupt is enabled, and the stack is not full, and the T0F bit is set, a
subroutine call to location 0CH occurs. The related interrupt request flag (T0F) is reset, and the EMI bit is
cleared to disable other maskable interrupts.
Timer/Event Counter 1 is operated in the same manner
but its related interrupt request flag is T1F (bit 4 of the
INTC1) and its subroutine call location is 10H.
Interrupt Source
The Serial Interface interrupt is initialized by setting the
interrupt request flag (SIF; bit 5 of the INTC1), which is
caused by completely receiving or transferring 8 bits of
data from a serial interface. After the interrupt is enabled, and the stack is not full, and the SIF bit is set, a
subroutine call to location 14H occurs. The related interrupt request flag (SIF) is reset and the EMI bit is cleared
to disable further maskable interrupts.
Vector
1
04H
External interrupt 1
2
08H
Timer/Event Counter 0 overflow
3
0CH
Timer/Event Counter 1 overflow
4
10H
Serial Interface interrupt
5
14H
Multi-function interrupt
6
18H
The RMT overflow interrupt flag (RMTVF; bit 0 of the
MFIS), real time clock interrupt flag (RTF; bit 1 of the
MFIS), the RMT rising edge interrupt flag (RMT0F; bit 2
of the MFIS) and the RMT falling edge interrupt flag
(RMT1F; bit 3 of the MFIS) indicate that a related interrupt has occurred. After reading these flags, these flags
will not be cleared automatically, they should be cleared
by the user.
The multi-function interrupt is initialized by setting the interrupt request flag (MFF; bit 6 of the INTC1), which is
caused by a regular real time clock signal, or caused by
a rising edge of RMT, or caused by a falling edge of
RMT, or caused by an RMT overflow. After the interrupt
is enabled, and the stack is not full, and the MFF bit is
set, a subroutine call to location 18H occurs. The related
interrupt request flag (MFF) is reset and the EMI bit is
cleared to disable further maskable interrupts.
The serial interface interrupt is indicated by the interrupt
flag (SIF; bit 5 of the INTC1), that is caused by receiving or
transferring a complete 8-bit data transfer between the
HT49RV3/HT49CV3 and an external device. After the interrupt is enabled (by setting ESII; bit 1 of the INTC1), and
the stack is not full, a subroutine call to location 14H occurs.
The Timer/Event Counter 0 interrupt request flag (T0F),
external interrupt 1 request flag (EIF1), external interrupt 0 request flag (EIF0), enable Timer/Event Counter0
interrupt bit (ET0I), enable external interrupt 1 bit (EEI1),
enable external interrupt 0 bit (EEI0), and enable master
During the execution of an interrupt subroutine, other
maskable interrupt acknowledgments are all held until
the ²RETI² instruction is executed or the EMI bit and the
Rev. 1.30
Priority
External interrupt 0
11
March 20, 2007
HT49RV3/HT49CV3
power. The 32768Hz crystal oscillator still runs in the
HALT mode. If the 32768Hz crystal oscillator is selected
as the system oscillator, the system oscillator is not
stopped but the instruction execution is stopped. Since
the 32768Hz oscillator is also designed for timing purposes, the internal timing (RTC, WDT) operation still
runs even if the system enters the HALT mode.
interrupt bit (EMI) constitute the Interrupt Control register 0 (INTC0) which is located at 0BH in the RAM.
The multi-function interrupt request flag (MFF), serial interface interrupt request flag (SIF), Timer/Event Counter
1 interrupt request flag (T1F), enable multi-function interrupt (EMFI), enable serial interface interrupt bit
(ESII), and enable Timer/Event Counter 1 interrupt bit
(ET1I), constitute the Interrupt Control register 1
(INTC1) which is located at 1EH in the RAM.
The enable Remote control timer rising edge interrupt
(ERMT0), enable Remote control timer falling edge interrupt (ERMT1), enable Remote control timer overflow
interrupt (ERMTV), enable Remote control timer start
counting (RME), select the Remote control timer clock
source (RMCS), and select the Remote control timer
clock (RMS0, RMS1) constitute the Remote Timer control Register (RMTC) which is located at 21H in the
RAM.
Of the three oscillators, if the RC oscillator is used, an
external resistor between OSC1 and VSS is required,
and the range of the resistance should be from 56kW to
1.5MW. The system clock, divided by 4, is available on
OSC2 with pull-high resistor, which can be used to synchronize external logic. The RC oscillator provides the
most cost effective solution. However, the frequency of
the oscillation may vary with VDD, temperature, and the
chip itself due to process variations. It is therefore not
suitable for timing sensitive operations where accurate
oscillator frequency is desired.
EMI, EEI0, EEI1, ET0I, ET1I, ESII, ERTI, EMFI, ERMT0
and ERMT1 are all used to control the enable/disable
status of interrupts. These bits prevent the requested interrupt from being serviced. Once the interrupt request
flags (MFF, SIF, T0F, T1F, EIF1, EIF0) are all set, they
remain in the INTC0~INTC1 respectively until the interrupts are serviced or cleared by a software instruction.
On the other hand, if the crystal oscillator is selected, a
crystal across OSC1 and OSC2 is needed to provide the
feedback and phase shift for the oscillator, and no other
external components are required. A resonator may be
connected between OSC1 and OSC2 to replace the
crystal and to get a frequency reference, but two external capacitors on OSC1 and OSC2 are required.
It is recommended that a program should not use the
²CALL subroutine² within the interrupt subroutine. This
is because interrupts often occur in an unpredictable
manner or require to be serviced immediately in some
applications. During that period, if only one stack is left,
and enabling the interrupt is not well controlled, operation of the ²CALL² in the interrupt subroutine may damage the original control sequence.
There is another oscillator circuit designed for the real
time clock. In this case, only a 32768Hz crystal oscillator
can be applied. The crystal should be connected between OSC3 and OSC4.
The RTC oscillator circuit can be controlled to start-up
quickly by setting the ²QOSC² bit (bit 4 of the RTCC). It
is recommended to turn on the quick start-up function
during power-on, and then turn it off after 2 seconds.
The WDT oscillator is a free running on-chip RC oscillator and no external components are required. Although
the system enters the power down mode, the system
clock stops and the WDT oscillator still works with a period of approximately 65ms at 5V. The WDT oscillator
can be disabled by options so as to conserve power.
Oscillator Configuration
The HT49RV3/HT49CV3 provides three oscillator circuits for system clocks, i.e., RC oscillator, crystal oscillator and 32768Hz crystal oscillator, determined by
options. No matter what type of oscillator is selected, the
signal is used for the system clock. The HALT mode
stops the system oscillator (RC and crystal oscillator
only) and ignores external signals so as to conserve
O S C 3
O S C 1
O S C 4
O S C 2
3 2 7 6 8 H z C r y s ta l/R T C O s c illa to r
O S C 1
fS
Y S
/4
C r y s ta l O s c illa to r
O S C 2
R C
O s c illa to r
System Oscillator
Note: 32768Hz crystal enable condition: For WDT clock source or for system clock source.
The external resistor and capacitor components connected to the 32768Hz crystal are not necessary to provide
oscillation. For applications where precise RTC frequencies are essential, these components may be required
to provide frequency compensation due to different crystal manufacturing tolerances.
Rev. 1.30
12
March 20, 2007
HT49RV3/HT49CV3
Watchdog Timer - WDT
Multi-function Timer
The WDT clock source is implemented by a dedicated
RC oscillator (WDT oscillator) or an instruction clock
(system clock/4) or a real time clock oscillator (RTC oscillator). The timer is designed to prevent a software
malfunction or sequence from jumping to an unknown
location with unpredictable results. The WDT can be
disabled by options. But if the WDT is disabled, all executions related to the WDT lead to no operation.
The HT49RV3/HT49CV3 provides a multi-function timer
for the WDT and RTC but with different time-out periods.
The multi-function timer consists of an 8-stage divider
and a 7-bit prescaler, with the clock source coming from
the RTC OSC or the instruction clock (i.e., system clock
divided by 4). The multi-function timer also provides a
selectable frequency signal (ranging from fS/20 to fS/27)
for the VFD driver circuits, and a selectable frequency
signal (ranging from fS/21 to fS/28) for the buzzer output
by options. It is recommended to select a frequency as
close as possible to 32kHz for the VFD driver circuits to
obtain good display clarity.
Once an internal WDT oscillator (RC oscillator with a period of 65ms at 5V) is selected, it is divided by 212~215
(by configuration option to get the WDT time-out period).
The minimum WDT time-out period is 300ms~600ms.
This time-out period may vary with temperature, VDD
and process variations. By selecting the WDT configuration option, longer time-out periods can be realized. If
the WDT time-out is selected, 215, the maximum
time-out period is divided by 215~216 which is 2.3s~4.7s.
If the WDT oscillator is disabled, the WDT clock may still
come from the instruction clock and operates in the
same manner except that in the halt state the WDT may
stop counting and lose its protecting purposes. In this
situation the logic can only be restarted by external
logic. If the device operates in a noisy environment, using the on-chip RC oscillator (WDT OSC) is strongly recommended since the HALT will stop the system clock.
fS
R O M
C lo c k /4
R T C
O S C 3 2 7 6 8 H z
C o n fig u r a tio n
O p tio n
C o d e O p tio n
V F D D r iv e r ( fS /2 0 ~ fS /2 7 )
B u z z e r (fS /2 1~ fS /2 8)
Real Time Clock - RTC
The real time clock (RTC) is used to supply a regular internal interrupt. Its time-out period ranges from fS/28 to
fS/215 by software programming. Writing data to RT2,
RT1 and RT0 (bits 2, 1, 0 of RTCC; 09H) yields various
time-out periods. If the RTC time-out occurs and the interrupt is enabled, the related interrupt request flag
(RTF; bit 1 of the MFIS) is set and the multi-function interrupt request flag (MFF; bit 6 of the INTC1) is set. If the
interrupt (EMFI) is enabled, and the stack is not full, a
subroutine call to location 18H occurs.
The WDT overflow under normal operation initializes a
²chip reset² and sets the status bit ²TO². In the HALT
mode, the overflow initializes a ²warm reset², and only
the Program Counter and SP are reset to zero. To clear
the contents of the WDT, there are three methods to be
adopted, i.e., external reset (a low level to RES), software instruction, and a ²HALT² instruction. There are
two types of software instructions; ²CLR WDT² and the
other set - ²CLR WDT1² and ²CLR WDT2². Of these
two types of instruction, only one type of instruction can
be active at a time depending on the options - ²CLR
WDT² times selection option. If the ²CLR WDT² is selected (i.e., CLR WDT times is equal to one), any execution of the ²CLR WDT² instruction clears the WDT. In the
case where the two ²CLR WDT1² and ²CLR WDT2² instructions are chosen (i.e., CLR WDT times is equal to
two), these two instructions have to be executed to clear
the WDT, otherwise, the WDT may reset the chip due to
time-out.
S y s te m
D iv id e r
RT2
RT1
RT0
RTC Clock Divided Factor
0
0
0
2 8*
0
0
1
2 9*
0
1
0
210*
0
1
1
211*
1
0
0
212
1
0
1
213
1
1
0
214
1
1
1
215
Note: * not recommended to be used
fS
C o n fig u r a tio n
O p tio n
fW
fW
D T
D T
/2
D iv id e r
W D T
1 2 k H z
O S C
8
W D T
P r e s c a le r
M a s k O p tio n
W D T C le a r
C K
T
R
C K
T
R
T im e - o u t
fW D T /2 15~
fW D T /2 14~
fW D T /2 13~
fW D T /2 12~
R e s e t
fW D T /2 1
fW D T /2 1
fW D T /2 1
fW D T /2 1
6
5
4
3
Watchdog Timer
Rev. 1.30
13
March 20, 2007
HT49RV3/HT49CV3
The RTCC register descriptions are listed below.
Bit No.
Label
Read/
Write
Reset
Function
0~2
RT0~
RT2
R/W
1
8 to 1 multiplexer control inputs to select the real time clock prescaler
output
3, 5~7
¾
¾
¾
Unused bit, read as ²0²
0
32768Hz OSC quick start-up oscillating
0/1: quick/slow start
4
QOSC
R/W
RTCC (09H) Register
fS
D iv id e r
If an interrupt request flag is set to ²1² before entering
the ²HALT² mode, the wake-up function of the related interrupt will be disabled.
P r e s c a le r
R T 2
R T 1
R T 0
8 to 1 M u x .
fS /2 8~ fS /2 15
R T C In te rru p t
If a wake-up event occurs, it takes 1024 tSYS (system
clock period) to resume normal operation. In other
words, a dummy period will be inserted after a wake-up.
If the wake-up results from an interrupt acknowledge
signal, the actual interrupt subroutine execution will be
delayed by one or more cycles. However, if the wake-up
results in the next instruction execution, this will be executed immediately after the dummy period is finished.
Real Time Clock
Power Down Operation - HALT
The HALT mode is initialized by the ²HALT² instruction
and results in the following.
· The system oscillator turns off but the WDT oscillator
keeps running (if the WDT oscillator or the real time
clock is selected).
To minimize power consumption, all the I/O pins should
be carefully managed before entering the HALT mode.
· The contents of the on-chip RAM and of the registers
remain unchanged.
Reset
· The WDT is cleared and starts recounting (if the WDT
There are three ways in which a microcontroller reset
can occur, through events occurring both internally and
externally:
clock source is from the WDT oscillator or the real time
clock oscillator).
· All I/O ports maintain their original status.
· RES is reset during normal operation
· The PDF flag is set but the TO flag is cleared.
· RES is reset during HALT
· The VFD driver keeps running (if the RTC OSC is se-
· WDT time-out is reset during normal operation
lected).
The WDT time-out reset during HALT is a little different
from other kinds of reset. Most of the conditions remain
unchanged except that the Program Counter and Stack
Pointer will be cleared to 0 and the TO flag will be set to
1. Most registers are reset to the ²initial condition² once
the reset conditions are met.
The system can leave the HALT mode by means of an
external reset, an interrupt, an external falling edge signal on port A, an external rising/falling edge on the RMT
pin, or a WDT overflow. An external reset will initialize a
chip reset and a WDT overflow will initialize a ²warm reset². After examining the TO and PDF flags, the source
of the reset can be determined. The PDF flag is cleared
by a system power-up or by executing the ²CLR WDT²
instruction, and is set by executing the ²HALT² instruction. The TO flag is set if a WDT time-out occurs, and
causes a wake-up that only resets the Program Counter
and SP, the other flags remain in their original status.
The different types of resets described affect the reset
flags in different ways. These flags, the PDF and TO
flags, are located in the status register and are controlled by various microcontroller operations such as the
HALT function or Watchdog Timer. The reset flags are
shown in the table:
The port A wake-up and interrupt methods can be considered as a continuation of normal execution. Each bit
in port A can be independently selected to wake-up the
device by options. Awakening from an I/O port stimulus,
the program will resume execution at the next instruction. If the system is woken up via an interrupt, two possibilities may occur. If the related interrupt is disabled or
the interrupt is enabled but the stack is full, the program
will resume execution at the next instruction. But if the
interrupt is enabled and the stack is not full, a regular interrupt response takes place.
Rev. 1.30
TO
PDF
RESET Conditions
0
0
RES reset during power-up
u
u
RES reset during normal operation
0
1
RES Wake-up HALT
1
u
WDT time-out during normal operation
1
1
WDT Wake-up HALT
Note: ²u² stands for unchanged
14
March 20, 2007
HT49RV3/HT49CV3
H A L T
To ensure that the system oscillator is started and stabilized, the SST (System Start-up Timer) provides an extra delay of 1024 system clock pulses when the system
awakes from the HALT state or during power-on.
W D T
000H
Disabled
Prescaler, Divider
Cleared
WDT, RTC, Remote
Control Timer
Cleared. After master reset,
WDT starts counting
E x te rn a l
C o ld
R e s e t
S S T
1 0 - b it R ip p le
C o u n te r
O S C 1
P o w e r - o n D e te c tio n
The functional unit chip reset status is shown below.
Interrupt
R e s e t
T im e - o u t
R e s e t
R E S
An extra SST delay is added during the power-on period, and any wake-up from HALT may enable only the
SST delay.
Program Counter
W a rm
W D T
Reset Configuration
V D D
R E S
tS
S T
S S T T im e - o u t
Timer/Event Counter Off
C h ip
Input/Output Ports
Input mode
Stack Pointer
Points to the top of the stack
R e s e t
Reset Timing Chart
V
D D
0 .0 1 m F *
1 0 0 k W
R E S
1 0 k W
0 .1 m F *
Reset Circuit
Note: ²*² Make the length of the wiring, which is connected to the RES pin as short as possible, to
avoid noise interference.
The register states are summarized below:
Register
TMR0H
Reset
(Power-on)
WDT Time-out
RES Reset
(Normal Operation) (Normal Operation)
RES Reset
(HALT)
WDT Time-out
(HALT)*
xxxx xxxx
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
TMR0L
xxxx xxxx
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
TMR0C
00-0 1000
00-0 1000
00-0 1000
00-0 1000
uu-u uuuu
TMR1H
xxxx xxxx
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
TMR1L
xxxx xxxx
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
TMR1C
0000 1---
0000 1---
0000 1---
0000 1---
uuuu u---
Program
Counter
0000H
0000H
0000H
0000H
0000H
MP0
xxxx xxxx
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
MP1
xxxx xxxx
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
BP
--0- -000
--0- -000
--0- -000
--0- -000
--u- -uuu
ACC
xxxx xxxx
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
TBLP
xxxx xxxx
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
TBLH
xxxx xxxx
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
STATUS
--00 xxxx
--1u uuuu
--uu uuuu
--01 uuuu
--11 uuuu
Rev. 1.30
15
March 20, 2007
HT49RV3/HT49CV3
Register
Reset
(Power-on)
WDT Time-out
RES Reset
(Normal Operation) (Normal Operation)
RES Reset
(HALT)
WDT Time-out
(HALT)*
INTC0
-000 0000
-000 0000
-000 0000
-000 0000
-uuu uuuu
INTC1
-000 -000
-000 -000
-000 -000
-000 -000
-uuu -uuu
RMTC
0000 000-
0000 000-
0000 000-
0000 000-
uuuu uuu-
MFIS
---0 0000
---0 0000
---0 0000
---0 0000
---u uuuu
RTCC
---0 -111
---0 -111
---0 -111
---0 -111
---u -uuu
PA
1111 1111
1111 1111
1111 1111
1111 1111
uuuu uuuu
PAC
1111 1111
1111 1111
1111 1111
1111 1111
uuuu uuuu
PB
---- 1111
---- 1111
---- 1111
---- 1111
---- uuuu
PBC
---- 1111
---- 1111
---- 1111
---- 1111
---- uuuu
PC
1--- ----
1--- ----
1--- ----
1--- ----
u--- ----
PCC
1--- ----
1--- ----
1--- ----
1--- ----
u--- ----
PD
1111 ----
1111 ----
1111 ----
1111 ----
uuuu ----
PDC
1111 ----
1111 ----
1111 ----
1111 ----
uuuu ----
SBCR
0110 0000
0110 0000
0110 0000
0110 0000
uuuu uuuu
SBDR
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
uuuu uuuu
RMT0
0000 0000
0000 0000
0000 0000
0000 0000
uuuu uuuu
RMT1
0000 0000
0000 0000
0000 0000
0000 0000
uuuu uuuu
VFDC
0000 -111
0000 -111
0000 -111
0000 -111
0000 -111
Note: ²*² stands for ²warm reset²
²u² stands for ²unchanged²
²x² stands for ²unknown²
Timer/Event Counter
Two timer/event counters (TMR0,TMR1) are implemented in the microcontroller. The Timer/Event
Counter 0 contains a 16-bit programmable count-up
counter and the clock may come from an external
source or an internal clock source. An internal clock
source comes from fSYS. The Timer/Event Counter 1
contains a 16-bit programmable count-up counter
and the clock may come from an external source or
an internal clock source. An internal clock source comes from fSYS/4 or 32768Hz selected by option. The
external clock input allows the user to count external
events, measure time intervals or pulse widths, or to
generate an accurate time base.
There are six registers related to the Timer/Event
Counter 0 and Timer/Event Counter 1; TMR0H
(0CH), TMR0L (0DH), TMR0C (0EH) and the
Timer/Event Counter 1, TMR1H (0FH), TMR1L (10H),
and TMR1C (11H). Writing TMR0L (TMR1L) will only
place the written data to an internal lower-order byte
buffer (8-bit) and writing TMR0H (TMR1H) will transfer the specified data and the contents of the
lower-order byte buffer to TMR0H (TMR1H) and
TMR0L (TMR1L) registers, respectively. The
Timer/Event Counter 1/0 preload register is changed
by each writing TMR0H (TMR1H) operations. Read-
Rev. 1.30
ing TMR0H (TMR1H) will latch the contents of TMR0H
(TMR1H) and TMR0L (TMR1L) counters to the destination
and the lower-order byte buffer, respectively. Reading the
TMR0L (TMR1L) will read the contents of the lower-order
byte buffer. The TMR0C (TMR1C) is the Timer/Event
Counter 0 (1) control register, which defines the operating
mode, counting enable or disable and an active edge.
The TM0 and TM1 bits define the operation mode. The
event count mode is used to count external events, which
means that the clock source is from an external (TMR0,
TMR1) pin. The timer mode functions as a normal timer
with the clock source coming from the internal selected
clock source. Finally, the pulse width measurement mode
can be used to count the high or low level duration of the
external signal (TMR0, TMR1), and the counting is based
on the internal selected clock source.
In the event count or timer mode, the timer/event counter
starts counting at the current contents in the timer/event
counter and ends at FFFFH. Once an overflow occurs, the
counter is reloaded from the timer/event counter preload
register, and generates an interrupt request flag (T0F; bit 6
of the INTC0, T1F; bit 4 of the INTC1). In the pulse width
measurement mode with the values of the TON and TE
bits equal to 1, after the TMR0 (TMR1) has received a transient from low to high (or high to low if the TE bit is ²0²), it
will start counting until the TMR0 (TMR1) returns to the
16
March 20, 2007
HT49RV3/HT49CV3
In the case of timer/event counter OFF condition, writing
data to the timer/event counter preload register also reloads that data to the timer/event counter. But if the
timer/event counter is turned on, data written to the
timer/event counter is kept only in the timer/event counter preload register. The timer/event counter still continues its operation until an overflow occurs.
original level and resets the TON. The measured result
remains in the timer/event counter even if the activated
transient occurs again. In other words, only 1-cycle
measurement can be made until the TON bit is set. The
cycle measurement will continue as long as it receives
further transient pulse. In this operation mode, the
timer/event counter begins counting not according to
the logic level but to the transient edges. In the case of
counter overflows, the counter is reloaded from the
timer/event counter register and issues an interrupt request, as in the other two modes, i.e., the event and
timer modes.
When the timer/event counter (reading TMR0/TMR1) is
read, the clock is blocked to avoid errors, as this may results in a counting error. Blocking of the clock should be
taken into account by the programmer. It is strongly recommended to load the desired value into the
TMR0/TMR1 register first, before turning on the related
timer/event counter, for proper operation since the initial
value of the TMR0/TMR1 is unknown. Due to the
timer/event counter scheme, the programmer should
pay special attention on the instruction to enable then
disable the timer for the first time, whenever there is a
need to use the timer/event counter function, to avoid
unpredictable result. After this procedure, the
timer/event function can be operated normally.
To enable the counting operation, the Timer ON bit
(TON; bit 4 of the TMR0C or TMR1C) should be set to 1.
In the pulse width measurement mode, TON is automatically cleared after the measurement cycle is completed.
But in the other two modes, TON can only be reset by instructions. The overflow of the Timer/Event Counter 0/1
is one of the wake-up sources and can also be applied
to a PFD (Programmable Frequency Divider) output at
PA3 by options. Only one PFD (PFD0 or PFD1) can be
applied to PA3 by options. No matter what the operation
mode is, writing a 0 to ET0I or ET1I disables the related
interrupt service. When the PFD function is selected, executing ²SET [PA].3² instruction will enable the PFD output and executing ²CLR [PA].3² instruction will disable
the PFD output.
fS
Bits 2~0 of the TMR0C can be used to define the prescaling stages of the internal clock sources of the timer/
event counter. The definitions are as shown. The overflow signal of the timer/event counter can be used to
generate the PFD signal.
8 - s ta g e P r e s c a le r
Y S
f IN
8 -1 M U X
T 0 P S C 2 ~ T 0 P S C 0
D a ta B u s
T
T 0 M 1
T 0 M 0
T M R 0
1 6 - b it T im e r /E v e n t C o u n te r
P r e lo a d R e g is te r
R e lo a d
T 0 E
P u ls e W id th
M e a s u re m e n t
M o d e C o n tro l
T 0 M 1
T 0 M 0
T 0 O N
O v e r flo w
to In te rru p t
1 6 - b it T im e r /E v e n t C o u n te r
(T M R 0 H /T M R 0 L )
T
Q
P F D 0
P A 3 D a ta C T R L
Timer/Event Counter 0
fS
Y S
/4
3 2 7 6 8 H z
T 1 S
M
U
f IN
D a ta B u s
T
X
T 1 M 1
T 1 M 0
T M R 1
1 6 - b it T im e r /E v e n t C o u n te r R e lo a d
P r e lo a d R e g is te r
T 1 E
T 1 M 1
T 1 M 0
T 1 O N
P u ls e W id th
M e a s u re m e n t
M o d e C o n tro l
O v e r flo w
to In te rru p t
1 6 - b it T im e r /E v e n t C o u n te r
(T M R 1 H /T M R 1 L )
T
Q
P F D 1
P A 3 D a ta C T R L
Timer/Event Counter 1
Rev. 1.30
17
March 20, 2007
HT49RV3/HT49CV3
Bit No.
0~2
Label
Function
Defines the prescaler stages.
T0PSC2, T0PSC1, T0PSC0=
000: fINT=fSYS
001: fINT=fSYS/2
T0PSC0~ 010: fINT=fSYS/4
T0PSC2
011: fINT=fSYS/8
100: fINT=fSYS/16
101: fINT=fSYS/32
110: fINT=fSYS/64
111: fINT=fSYS/128
3
T0E
Defines the TMR0 active edge of the timer/event counter:
In Event Counter Mode (T0M1,T0M0)=(0,1):
1:count on falling edge;
0:count on rising edge
In Pulse Width measurement mode (T0M1,T0M0)=(1,1):
1: start counting on the rising edge, stop on the falling edge;
0: start counting on the falling edge, stop on the rising edge
4
T0ON
Enable/disable timer counting (0=disable; 1=enable)
5
¾
6
7
T0M0
T0M1
Unused bit, read as ²0²
Defines the operating mode (T0M1, T0M0)
01= Event count mode (External clock)
10= Timer mode (Internal clock)
11= Pulse Width measurement mode (External clock)
00= Unused
TMR0C (0EH) Register
Bit No.
Label
0~2
¾
Function
Unused bit, read as ²0²
3
T1E
Defines the TMR1 active edge of the timer/event counter:
In Event Counter Mode (T1M1,T1M0)=(0,1):
1:count on falling edge;
0:count on rising edge
In Pulse Width measurement mode (T1M1,T1M0)=(1,1):
1: start counting on the rising edge, stop on the falling edge;
0: start counting on the falling edge, stop on the rising edge
4
T1ON
Enable/disable timer counting (0= disable; 1= enable)
5
T1S
Defines the TMR1 internal clock source (0=fSYS/4; 1=32768Hz)
T1M0
T1M1
Defines the operating mode (T1M1, T1M0)
01= Event count mode (External clock)
10= Timer mode (Internal clock)
11= Pulse Width measurement mode (External clock)
00= Unused
6
7
TMR1C (11H) Register
Rev. 1.30
18
March 20, 2007
HT49RV3/HT49CV3
Remote Control Timer - RMT
The RMT pin with rising/falling edge wake-up function,
8-bit timer counter will be cleared during a chip reset.
The HT49RV3/HT49CV3 provides an 8-bit remote control timer that has a pulse width measurement function.
Pulse width is measured from a difference in count value
when the valid edge (RMT pin) has been detected while
the timer operates in the running mode.
And the RMT clock starts to count after the rising/falling
edge trigger.
In te rru p t (R M T 0 F )
N o is e R e je c tio n
R is in g E d g e
D e te c tio n
R M T
fS
fS
Y S
Y S
/4
M
U
fX
X
R M C S
L a tc h
R e m o te C o n tr o l T im e r
C a p tu r e R e g is te r
R M T 0 (2 2 H )
fX /2 5~ fX /2 8
P r e - s c a le r
O v e r flo w
4 -1 M U X
R M S 1 R M S 0
(R M T V F )
8 - b it T im e r C o u n te r
C le a r
R M E
N o is e R e je c tio n
F a llin g E d g e
D e te c tio n
L a tc h
R e m o te C o n tr o l T im e r
C a p tu r e R e g is te r
R M T 1 (2 3 H )
In te rru p t (R M T 1 F )
Remote Control Timer
Bit No.
Label
Function
0
¾
1
ERMT0
Controls the remote control timer rising edge interrupt (1=enable; 0=disable)
2
ERMT1
Controls the remote control timer falling edge interrupt (1=enable; 0=disable)
3
ERMTV
Controls the remote control timer overflow interrupt (1=enable; 0=disable)
Unused bit, read as ²0²
4
RME
5
RMCS
Selects the remote control timer clock source fX (1=fSYS; 0=fSYS/4)
RMS0
RMS1
Selects the remote control timer clock
00=fX/25
01= fX/26
10= fX/27
11= fX/28
6~7
Controls the remote control timer (1=enable & start count; 0=disable & clear counter)
RMTC (21H) Register
Bit No.
Label
Function
0
RMTVF
Remote control timer overflow interrupt flag (1=indicates that an overflow has occurred; 0=indicates that an overflow has not occurred)
1
RTF
Real time clock interrupt flag (1=indicates that an RTC interrupt has occurred; 0=indicates that
an RTC interrupt has not occurred)
2
RMT0F
Remote control timer rising edge interrupt flag (1=indicates that a rising edge interrupt has occurred; 0=indicates that a rising edge interrupt has not occurred)
3
RMT1F
Remote control timer falling edge interrupt flag (1=indicates that a falling edge interrupt has
occurred; 0=indicates that a falling edge interrupt has not occurred)
4
ERTI
5~7
¾
Controls the Real Time Clock interrupt (1=enable; 0=disable)
Unused bit, read as ²0²
MFIS (29H) Register
Rev. 1.30
19
March 20, 2007
HT49RV3/HT49CV3
Serial Interface
The Serial Interface function has four basic signals included. They are the SDI (serial data input), SDO (serial data output), SCK (serial clock) and SCS (slave select pin).
Two registers (SBCR & SBDR) unique to the serial interface provide control, status and data storage.
S B E N = 1 , C S E N = 0 ( if p u ll- h ig h e d )
S C S
S B E N = C S E N = 1
S C K
S D I
S D O
D 7 /D 0
D 6 /D 1
D 5 /D 2
D 4 /D 3
D 3 /D 4
D 2 /D 5
D 1 /D 6
D 0 /D 7
D 7 /D 0
D 6 /D 1
D 5 /D 2
D 4 /D 3
D 3 /D 4
D 2 /D 5
D 1 /D 6
D 0 /D 7
SIO Timing (SIOCLK Configuration is Falling Edge)
S B E N = 1 , C S E N = 0 ( if p u ll- h ig h e d )
S C S
S B E N = C S E N = 1
S C K
S D I
S D O
D 7 /D 0
D 6 /D 1
D 5 /D 2
D 4 /D 3
D 3 /D 4
D 2 /D 5
D 1 /D 6
D 0 /D 7
D 7 /D 0
D 6 /D 1
D 5 /D 2
D 4 /D 3
D 3 /D 4
D 2 /D 5
D 1 /D 6
D 0 /D 7
SIO Timing (SIOCLK Configuration is Rising Edge)
Bit No.
Label
Function
0
TRF
Serial interface data transferred or data received flag
1: data transferred or data received
This bit is set by SIO hardware and should be cleared by software after data transferred or
data received.
1
WCOL
2
CSEN
3
MLS
4
SBEN
5, 6
M0, M1
7
CKS
This bit shows the situation of the buffer SBDR
1: enable (set by SIO) writing to SBDR
0: disable (cleared by user) reading from SBDR
Serial bus selection signal
Shift first control bit (1: MSB; 0: LSB)
Serial bus selection (1: enable; 0: disable)
Master/slave mode selection: M1, M0=
00: master mode, baud rate=fSIO
01: master mode, baud rate=fSIO/4
10: master mode, baud rate=fSIO/16
11: slave mode
Clock source selection (0: fSYS/4; 1: fRTCOSC)
SBCR (1FH) Register
· SBCR: Serial bus control register
¨
Bit 7 (CKS): clock source selection:
fSIO=fSYS/4 or fRTCOSC
¨
Bit 6 (M1), Bit 5 (M0): master/slave mode & baud
rate selection
-
10: master mode, baud rate=fSIO/16
11: slave mode
¨
Enable: (SCS dependent on CSEN bit)
Disable ® enable: SCK, SDI, SDO, SCS=0 and
waiting for writing data to SBDR (TXRX buffer)
M1, M0:
00: master mode, baud rate=fSIO
Master mode: write data to SBDR (TXRX buffer)
® start transmission/reception automatically
01: master mode, baud rate=fSIO/4
Rev. 1.30
Bit 4 (SBEN): serial bus enable/disable (1/0)
-
20
March 20, 2007
HT49RV3/HT49CV3
-
Master mode: when data has been transferred ®
set TRF
-
Slave mode: when a SCK (and SCS dependent
on CSEN) is received, data in TXRX buffer is
shifted-out and data on SDI is shifted-in
-
Slave transmitter: data I/O started by clock received
Slave receiver: data I/O started by clock received
Clock Polarity=Rising Edge or Falling Edge
(Configuration Option)
Disable: SCK, SDI, SCS floating, SDO output
high
· Serial interface operation
¨
Bit 3 (MLS): MSB or LSB (1/0) shift first control bit
¨
Bit 2 (CSEN): serial bus selection signal enable/disable (SCS), when CSEN=0, SCS is floating
Step1: Select CKS and select M1, M0 = 00, 01, 10
¨
Bit 1 (WCOL): this bit is set to 1 if data is written to
SBDR (TXRX buffer) when data is transferred ®
writing will be ignored if data is written to SBDR
(TXRX buffer) when data is transferred
Step3: Set SBEN
¨
¨
Master mode operation
Step2: Select CSEN, MLS (the same as the slave)
Step4: Writing data to SBDR
data is stored in TXRX buffer
-
Bit 0 (TRF): data transferred or data received ®
used to generate interrupt
Note: data receiving is still working when the MCU
enters the HALT mode
-
output SCK and SCS signals
-
go to step 5
Note: SIO internal operation:
* data stored in TXRX buffer, and SDI data
is shifted into TXRX buffer
* data transferred, data in TXRX buffer is
latched into SBDR
· SBDR: Serial bus data register
¨
Data written to SBDR ® write data to TXRX buffer
only
¨
Data read from SBDR ® read from SBDR only
¨
Operating Mode description
Step5: Check WCOL
-
WCOL= 1, clear WCOL and go to step 4
-
WCOL= 0, go to step 6
Step6: Check TRFor waiting for serial bus interrupt
-
Master transmitter: clock sending and data I/O
started by writing SBDR
-
Master clock sending started by writing SBDR
Step7: Read data from SBDR
Step8: Clear TRF
Step9: Go to step 4
D a ta B u s
S B D R
( R e c e iv e d D a ta R e g is te r )
M
D 7 D 6 D 5 D 4 D 3 D 2 D 1 D 0
U
S D O
X
M L S
A N D , S ta rt
E N
S C K
A N D , S ta rt
C lo c k P o la r ity
S B E N
M
U
X
C 0
C 1
X
S D I
C 2
T D R F
W C O L F la g
In te r n a l B u s y F la g
W r ite S B D R
S B E N
A N D , S ta rt
E N
C S E N
U
A N D
M a s te r
o r
S la v e
S D O
S B E N
M
In te r n a l B a u d R a te C lo c k
B u ffe r
S B E N
W r ite S B D R E n a b le /D is a b le
W r ite S B D R
S C S
M a s te r o r S la v e
SIO Block Diagram
Rev. 1.30
21
March 20, 2007
HT49RV3/HT49CV3
¨
Slave mode operation
Some instructions first input data and then follow the
output operations. For example, ²SET [m].i², ²CLR
[m].i², ²CPL [m]², ²CPLA [m]² read the entire port states
into the CPU, execute the defined operations
(bit-operation), and then write the results back to the
latches or the accumulator.
Step1: CKS don¢t care and select M1, M0 =11
Step2: Select CSEN, MLS (the same as the master)
Step3: Set SBEN
Step4: Writing data to SBDR
-
data is stored in the TXRX buffer
-
waiting for master clock signal (and SCS): SCK
-
go to step 5
Each line of port A has the capability of waking-up the
device.
Note: SIO internal operation:
* SCK (SCS) received
* output data in TXRX buffer and SDI data
is shifted into TXRX buffer
* data transferred, data in TXRX buffer is
latched into SBDR
Each I/O port has a pull-high option. Once the pull-high
option is selected, the I/O port has a pull-high resistor,
otherwise, there¢s none. Take note that a non-pull-high
I/O port operating in input mode will cause a floating
state.
The PA3 pin is pin-shared with the PFD signal. If the
PFD option is selected, the output signal in the output
mode of PA3 will be the PFD signal generated by the
timer/event counter overflow signal. The input mode always retains its original functions. Once the PFD option
is selected, the PFD output signal is controlled by the
PA3 data register only. Writing a ²1² to the PA3 data register will enable the PFD output function and writing a
²0² will force the PA3 pin to remain at ²0². The I/O functions of PA3 are shown below.
Step5: Check WCOL
-
WCOL=1, clear WCOL, go to step 4
-
WCOL=0, go to step 6
Step6: Check TRFor waiting for serial bus interrupt
Step7: Read data from SBDR
Step8: Clear TRF
Step9: Go to step 4
Input/Output Ports
There are 17 bidirectional input/output lines in the
microcontroller, labeled as PA, PB, PC and PD, which
are mapped to the data memory of [12H], [14H], [16H]
and [18H], respectively. All of these I/O ports can be
used for input and output operations. For input operation, these ports are non-latching, that is, the inputs
must be ready at the T2 rising edge of instruction ²MOV
A,[m]² (m=12H, 14H, 16H or 18H). For output operation,
all the data is latched and remains unchanged until the
output latch is rewritten.
I/O
I/P
Mode (Normal)
PA3
I/P
(PFD)
O/P
(PFD)
Logical
Output
Logical
Input
PFD
(Timer on)
Note: The PFD frequency is the timer/event counter
overflow frequency divided by 2.
The descriptions of PFD control signal and PFD output
frequency are listed in the following table.
Timer
PA3 Data PA3 Pad
Timer Preload
Register
State
Value
Each I/O line has its own control register (PAC, PBC,
PCC, PDC) to control the input/output configuration.
With this control register, CMOS output or Schmitt Trigger input with or without pull-high resistor structures can
be reconfigured dynamically under software control. To
function as an input, the corresponding latch of the control register must write a ²1². The input source also depends on the control register. If the control register bit is
²1², the input will read the pad state. If the control register bit is ²0², the contents of the latches will move to the
internal bus. The latter is possible in the ²read-modifywrite² instruction.
OFF
PFD
Frequency
X
0
0
X
OFF
X
1
U
X
ON
N
0
0
X
ON
N
1
PFD
fTMR/[2´(M-N)]
Note: ²X² stands for unused
²U² stands for unknown
²M² is ²65536² for PFD0 or PFD1
²N² is preload value for timer/event counter
²fTMR² is input clock frequency for timer/event
counter
For an output function, CMOS is the only configuration.
These control registers are mapped to locations 13H,
15H, 17H and 19H.
The PA0 and PA1 pins are pin-shared with the BZ and
BZ signal, respectively. If the BZ/BZ option is selected,
the output signal in the output mode of PA0/PA1 will be
the buzzer signal generated by the multi-function timer.
The input mode always remains in its original function.
Once the BZ/BZ option is selected, the buzzer output
signal are controlled by the PA0/PA1 data register only.
After a chip reset, these input/output lines remain at high
levels or floating state (depending on pull-high options).
Each bit of these input/output latches can be set or
cleared by ²SET [m].i² and ²CLR [m].i² (m=12H, 14H,
16H or 18H) instructions.
Rev. 1.30
Logical
Input
O/P
(Normal)
22
March 20, 2007
HT49RV3/HT49CV3
V
C o n tr o l B it
W r ite C o n tr o l R e g is te r
P u ll- h ig h
Q
D
D a ta B u s
D D
P A
P A
P A
P A
P A
P B
P C
P D
P D
P D
P D
Q
C K
S
C h ip R e s e t
R e a d C o n tr o l R e g is te r
D a ta B it
Q
D
W r ite D a ta R e g is te r
C K
S
Q
M
P A 0 /P A 1 /P A 3
B Z /B Z /P F D
M
R e a d D a ta R e g is te r
U
T 0
T 1
R 0
R 1
fo
fo
fo
fo
r P
r P
r P
r P
D 4
D 5
D 6
D 7
o n
o n
o n
o n
2
3 /P
4 ~ P
0 ~ P
7 /R
4 /IN
5 /IN
6 /T
7 /T
F D
A
B
M
T
T
T
3
7
0
1
M R 0
M R 1
X
P F D E N
(P A 3 )
X
S y s te m W a k e -u p
( P A o n ly )
IN
IN
T M
T M
U
0 /B Z
1 /B Z
O P 0 ~ O P 7
ly
ly
ly
ly
Input/Output Ports
VFD Display Memory
The I/O function of PA0/PA1 are shown below.
PA0 I/O
I
I
O O O O O O O O
PA1 I/O
I
O
I
PA0 Mode
X X C B B C B B B B
PA1 Mode
X C X X X C C C B B
PA0 Data
X X D 0
PA1 Data
X D X X X D1 D D X X
PA0 Pad Status
I
I
D 0
B D0 0
0
B
PA1 Pad Status
I
D
I
I D1 D D 0
B
I
I
I
The HT49RV3/HT49CV3 provides an area of embedded
data memory for the VFD display. This area is located
from 40H to 55H of the RAM at Bank 1. The Bank Pointer
(BP; located at 04H of the RAM) is the switch for the RAM
and the VFD display memory. When the BP is set as ²1²,
any data written into 40H~55H will affect the VFD display.
When the BP is written as ²0² any data written into
40H~55H is meant to access the general purpose data
memory. The VFD display memory can be read and written to only by an indirect addressing mode using MP1.
When data is written into the display data area, it is automatically read by the VFD driver which then generates
the corresponding VFD driving signals. To turn the display on or off, a ²1² or a ²0² is written to the corresponding
bit of the display memory, respectively. The figure illustrates the mapping between the display memory and
VFD pattern for the HT49RV3/HT49CV3.
O O O O O
1 D0 0
1
B
0
1
Note: ²I² input; ²O² output
²D, D0, D1² Data
²B² buzzer option, BZ or BZ
²X² don¢t care
²C² CMOS output
It is recommended that unused or not bonded out I/O
lines should be set as output pins by software instructions to avoid consuming power under input floating
state.
Rev. 1.30
23
March 20, 2007
HT49RV3/HT49CV3
SEG15~
SEG12
SEG11~
SEG8
SEG7~
SEG4
SEG3~
SEG0
Grid0
41HU
41HL
40HU
40HL
Grid1
43HU
43HL
42HU
42HL
Grid2
45HU
45HL
44HU
44HL
Grid3
47HU
47HL
46HU
46HL
Grid4
49HU
49HL
48HU
48HL
Grid5
4BHU
4BHL
4AHU
4AHL
Grid6
4DHU
4DHL
4CHU
4CHL
Grid7
4FHU
4FHL
4EHU
4EHL
Grid8
51HU
51HL
50HU
50HL
Grid9
53HU
53HL
52HU
52HL
Grid10
55HU
55HL
54HU
54HL
b7
b4 b3
b0
HU
HL
Higher 4 bits
Lower 4 bits
VFD Display Memory
VFD Display Control Register - VFDC
Bit No.
2~0
Label
Function
The VFD clock source may come from the RTC or the
system clock/4 (fSYS/4).
Selects the VFD display mode
000= 4 grids, 16 segments
001= 5 grids, 16 segments
010= 6 grids, 16 segments
VGS2~
011= 7 grids, 15 segments
VGS0 100= 8 grids, 14 segments
101= 9 grids, 13 segments
110= 10 grids, 12 segments
111= 11 grids, 11 segments
3
¾
4
VFDE
7~5
At power-on initial, the 11-grid, 11-segment & 1/16 pulse
width are set and the VFD display is disabled.
G r id 0
G r id 1
Unused bit, read as ²0²
Controls the VFD display
(1=enable; 0=disable)
G r id 0
S e g m e n ts
O N
Sets the VFD dimming quantity
000= set pulse width to 1/16.
001= set pulse width to 2/16.
010= set pulse width to 4/16.
VDM2~
011= set pulse width to 10/16.
VDM0
100= set pulse width to 11/16.
101= set pulse width to 12/16.
110= set pulse width to 13/16.
111= set pulse width to 14/16.
G r id 1
S e g m e n ts
O N
A ll
S e g m e n ts
O F F
VFDC (28H) Register
Rev. 1.30
V D D
0 V
V E E
V D D
0 V
V E E
V D D
0 V
V E E
V D D
0 V
V E E
V D D
0 V
V E E
VFD Driver Output
24
March 20, 2007
HT49RV3/HT49CV3
Low Voltage Reset
The relationship between VDD and VLVR is shown below.
There is a low voltage reset circuit (LVR) implemented in
the microcontroller. This function can be enabled/disabled by options.
V D D
5 .5 V
If the supply voltage of the device is within the range
0.9V~VLVR, such as when changing a battery, the LVR
will automatically reset the device internally.
V
O P R
5 .5 V
V
The LVR includes the following specifications:
2 .2 V
nal state for longer than 1ms. If the low voltage state
does not exceed 1ms, the LVR will ignore it and will
not perform a reset function.
· The LVR uses an ²OR² function with the external RES
0 .9 V
signal to perform a chip reset.
V
L V R
3 .0 V
· The low voltage (0.9V~VLVR) has to remain in its origi-
Note: VOPR is the voltage range for proper chip
operation at 4MHz system clock.
D D
5 .5 V
V
L V R
L V R
D e te c t V o lta g e
0 .9 V
0 V
R e s e t S ig n a l
N o r m a l O p e r a tio n
R e s e t
*1
R e s e t
*2
Low Voltage Reset
Note: *1: To make sure that the system oscillator has stabilized, the SST provides an extra delay of 1024 system
clock pulses before starting normal operation.
*2: Since the low voltage has to maintain its original state for longer than 1ms, therefore a 1ms delay enters the
reset mode.
Rev. 1.30
25
March 20, 2007
HT49RV3/HT49CV3
Options
The following shows the configuration options in the HT49RV3/HT49CV3. All these options should be defined in order
to ensure having a properly functioning system.
Options
OSC type selection. This option is to decide if an RC or crystal or 32768Hz crystal oscillator is chosen as the system
clock.
fWDT: WDT clock source selection. There are three types of selections: system clock/4, RTC OSC or WDT OSC
fS: VFD, RTC and buzzer clock source selection. There are two types of selections: system clock/4 or RTC OSC
WDT enable/disable selection. WDT can be enabled or disabled by option.
WDT time-out period selection. There are four types of selection: WDT clock source divided by fWDT/212~fWDT/213,
fWDT/213~fWDT/214, fWDT/214~fWDT/215 or fWDT/215~fWDT/216
CLR WDT times selection. This option defines the method to clear the WDT by instruction. ²One time² means that
the ²CLR WDT² instructions can clear the WDT. ²Two times² means only if both of the ²CLR WDT1² and ²CLR
WDT2² instructions have been executed, the WDT can be cleared.
Buzzer output frequency selection. There are eight types of frequency signals for buzzer output: fS/21~fS/28,
²fS² means the clock source selected by options.
Wake-up selection. This option defines the wake-up capability. External I/O pins (PA only) all have the capability to
wake-up the chip from a HALT by a falling edge (bit option).
Pull-high selection.
This option is to determine whether the pull-high resistance is viable or not in the input mode of the I/O ports.
PA, PB0~PB3, PC7 and PD4~PD7 can be independently selected. (bit option)
RMT Pull-high selection. This option is to determine whether a pull-high resistance is viable or not in the input pin.
I/O pins shared with other function selections. PA0/BZ, PA1/BZ, PA3/PFD: PA0, PA1 and PA3 can be set as I/O pins
or buzzer outputs.
VFD driver clock selection. There are 8 types of frequency signals for the VFD driver circuits: fS/20~fS/27.
²fS² stands for the clock source selection by options.
VFD ON/OFF at HALT selection
LVR selection: LVR has enable or disable options
PFD selection. If PA3 is set as a PFD output, there are two types of selections; One is PFD0 as the PFD output, the
other is PFD1 as the PFD output. PFD0, PFD1 are the timer overflow signals of the Timer/Event Counter 0,
Timer/Event Counter 1, respectively.
INT0 or INT1 triggering edge: Disable; high to low; low to high; low to high or high to low
SIOCLK: Serial interface clock. There are falling edge or rising edge
CSEN: Serial bus selection: enable or disable
WCOL: SBDR write conflict
Rev. 1.30
26
March 20, 2007
HT49RV3/HT49CV3
Application Circuits
V
D D
0 .0 1 m F *
S E G
G
S E G
~ S E
V D D
1 0 0 k W
0 .1 m F
0
r id
1
G
~ S E
0 ~ G
1 /G r
1 5 /G
R E S
G 1
r id
id 1
r id
0
5
0
V F D
6
V E E
1 0 k W
V F D
0 .1 m F *
V S S
O S C
C ir c u it
P o w e r S u p p ly
0 .1 m F
O S C 1
S C S
C L K
S D I
S D O
O S C 1
O S C 2
R
R M T
C 1
S e e r ig h t s id e
3 2 7 6 8 H z
O S C 3
C 2
O S C 4
P
P D 4 /IN T 0
P
P D 5 /IN T 1
P D 6 /T M R 0
O S C
P
P
P A 0 /B
P A 1 /B
P A
A 3 /P F
A 4 ~ P A
B 0 ~ P B
C 6 ~ P C
Z
fS
Y S
/4
R C S y s te m O s c illa to r
5 6 k W < R O S C < 1 .5 M W
O S C 2
O S C 1
C ry s ta l S y s te m
O s c illa to r
O S C 2
Z
2
D
O S C 1
7
3
7
O S C 2
P D 7 /T M R 1
O S C
H T 4 9 R V 3 /H T 4 9 C V 3
3 2
O s
O S
u n
7 6 8 H z C ry s ta l S y s te m
c illa to r
C 1 a n d O S C 2 le ft
c o n n e c te d
C ir c u it
Note: The resistance and capacitance for reset circuit should be designed in such a way as to ensure that the VDD is
stable and remains within a valid operating voltage range before bringing RES high.
Rev. 1.30
27
March 20, 2007
HT49RV3/HT49CV3
Instruction Set Summary
Description
Instruction
Cycle
Flag
Affected
Add data memory to ACC
Add ACC to data memory
Add immediate data to ACC
Add data memory to ACC with carry
Add ACC to data memory with carry
Subtract immediate data from ACC
Subtract data memory from ACC
Subtract data memory from ACC with result in data memory
Subtract data memory from ACC with carry
Subtract data memory from ACC with carry and result in data memory
Decimal adjust ACC for addition with result in data memory
1
1(1)
1
1
1(1)
1
1
1(1)
1
1(1)
1(1)
Z,C,AC,OV
Z,C,AC,OV
Z,C,AC,OV
Z,C,AC,OV
Z,C,AC,OV
Z,C,AC,OV
Z,C,AC,OV
Z,C,AC,OV
Z,C,AC,OV
Z,C,AC,OV
C
1
1
1
1(1)
1(1)
1(1)
1
1
1
1(1)
1
Z
Z
Z
Z
Z
Z
Z
Z
Z
Z
Z
Increment data memory with result in ACC
Increment data memory
Decrement data memory with result in ACC
Decrement data memory
1
1(1)
1
1(1)
Z
Z
Z
Z
Rotate data memory right with result in ACC
Rotate data memory right
Rotate data memory right through carry with result in ACC
Rotate data memory right through carry
Rotate data memory left with result in ACC
Rotate data memory left
Rotate data memory left through carry with result in ACC
Rotate data memory left through carry
1
1(1)
1
1(1)
1
1(1)
1
1(1)
None
None
C
C
None
None
C
C
Move data memory to ACC
Move ACC to data memory
Move immediate data to ACC
1
1(1)
1
None
None
None
Clear bit of data memory
Set bit of data memory
1(1)
1(1)
None
None
Mnemonic
Arithmetic
ADD A,[m]
ADDM A,[m]
ADD A,x
ADC A,[m]
ADCM A,[m]
SUB A,x
SUB A,[m]
SUBM A,[m]
SBC A,[m]
SBCM A,[m]
DAA [m]
Logic Operation
AND A,[m]
OR A,[m]
XOR A,[m]
ANDM A,[m]
ORM A,[m]
XORM A,[m]
AND A,x
OR A,x
XOR A,x
CPL [m]
CPLA [m]
AND data memory to ACC
OR data memory to ACC
Exclusive-OR data memory to ACC
AND ACC to data memory
OR ACC to data memory
Exclusive-OR ACC to data memory
AND immediate data to ACC
OR immediate data to ACC
Exclusive-OR immediate data to ACC
Complement data memory
Complement data memory with result in ACC
Increment & Decrement
INCA [m]
INC [m]
DECA [m]
DEC [m]
Rotate
RRA [m]
RR [m]
RRCA [m]
RRC [m]
RLA [m]
RL [m]
RLCA [m]
RLC [m]
Data Move
MOV A,[m]
MOV [m],A
MOV A,x
Bit Operation
CLR [m].i
SET [m].i
Rev. 1.30
28
March 20, 2007
HT49RV3/HT49CV3
Instruction
Cycle
Flag
Affected
Jump unconditionally
Skip if data memory is zero
Skip if data memory is zero with data movement to ACC
Skip if bit i of data memory is zero
Skip if bit i of data memory is not zero
Skip if increment data memory is zero
Skip if decrement data memory is zero
Skip if increment data memory is zero with result in ACC
Skip if decrement data memory is zero with result in ACC
Subroutine call
Return from subroutine
Return from subroutine and load immediate data to ACC
Return from interrupt
2
1(2)
1(2)
1(2)
1(2)
1(3)
1(3)
1(2)
1(2)
2
2
2
2
None
None
None
None
None
None
None
None
None
None
None
None
None
Read ROM code (current page) to data memory and TBLH
Read ROM code (last page) to data memory and TBLH
2(1)
2(1)
None
None
No operation
Clear data memory
Set data memory
Clear Watchdog Timer
Pre-clear Watchdog Timer
Pre-clear Watchdog Timer
Swap nibbles of data memory
Swap nibbles of data memory with result in ACC
Enter power down mode
1
1(1)
1(1)
1
1
1
1(1)
1
1
None
None
None
TO,PDF
TO(4),PDF(4)
TO(4),PDF(4)
None
None
TO,PDF
Mnemonic
Description
Branch
JMP addr
SZ [m]
SZA [m]
SZ [m].i
SNZ [m].i
SIZ [m]
SDZ [m]
SIZA [m]
SDZA [m]
CALL addr
RET
RET A,x
RETI
Table Read
TABRDC [m]
TABRDL [m]
Miscellaneous
NOP
CLR [m]
SET [m]
CLR WDT
CLR WDT1
CLR WDT2
SWAP [m]
SWAPA [m]
HALT
Note: x: Immediate data
m: Data memory address
A: Accumulator
i: 0~7 number of bits
addr: Program memory address
Ö: Flag is affected
-: Flag is not affected
(1)
: If a loading to the PCL register occurs, the execution cycle of instructions will be delayed for one more cycle
(four system clocks).
(2)
: If a skipping to the next instruction occurs, the execution cycle of instructions will be delayed for one more
cycle (four system clocks). Otherwise the original instruction cycle is unchanged.
(3) (1)
:
(4)
and (2)
: The flags may be affected by the execution status. If the Watchdog Timer is cleared by executing the
²CLR WDT1² or ²CLR WDT2² instruction, the TO and PDF are cleared.
Otherwise the TO and PDF flags remain unchanged.
Rev. 1.30
29
March 20, 2007
HT49RV3/HT49CV3
Instruction Definition
ADC A,[m]
Add data memory and carry to the accumulator
Description
The contents of the specified data memory, accumulator and the carry flag are added simultaneously, leaving the result in the accumulator.
Operation
ACC ¬ ACC+[m]+C
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
Ö
Ö
Ö
Ö
ADCM A,[m]
Add the accumulator and carry to data memory
Description
The contents of the specified data memory, accumulator and the carry flag are added simultaneously, leaving the result in the specified data memory.
Operation
[m] ¬ ACC+[m]+C
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
Ö
Ö
Ö
Ö
ADD A,[m]
Add data memory to the accumulator
Description
The contents of the specified data memory and the accumulator are added. The result is
stored in the accumulator.
Operation
ACC ¬ ACC+[m]
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
Ö
Ö
Ö
Ö
ADD A,x
Add immediate data to the accumulator
Description
The contents of the accumulator and the specified data are added, leaving the result in the
accumulator.
Operation
ACC ¬ ACC+x
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
Ö
Ö
Ö
Ö
ADDM A,[m]
Add the accumulator to the data memory
Description
The contents of the specified data memory and the accumulator are added. The result is
stored in the data memory.
Operation
[m] ¬ ACC+[m]
Affected flag(s)
Rev. 1.30
TO
PDF
OV
Z
AC
C
¾
¾
Ö
Ö
Ö
Ö
30
March 20, 2007
HT49RV3/HT49CV3
AND A,[m]
Logical AND accumulator with data memory
Description
Data in the accumulator and the specified data memory perform a bitwise logical_AND operation. The result is stored in the accumulator.
Operation
ACC ¬ ACC ²AND² [m]
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
Ö
¾
¾
AND A,x
Logical AND immediate data to the accumulator
Description
Data in the accumulator and the specified data perform a bitwise logical_AND operation.
The result is stored in the accumulator.
Operation
ACC ¬ ACC ²AND² x
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
Ö
¾
¾
ANDM A,[m]
Logical AND data memory with the accumulator
Description
Data in the specified data memory and the accumulator perform a bitwise logical_AND operation. The result is stored in the data memory.
Operation
[m] ¬ ACC ²AND² [m]
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
Ö
¾
¾
CALL addr
Subroutine call
Description
The instruction unconditionally calls a subroutine located at the indicated address. The
program counter increments once to obtain the address of the next instruction, and pushes
this onto the stack. The indicated address is then loaded. Program execution continues
with the instruction at this address.
Operation
Stack ¬ Program Counter+1
Program Counter ¬ addr
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
CLR [m]
Clear data memory
Description
The contents of the specified data memory are cleared to 0.
Operation
[m] ¬ 00H
Affected flag(s)
Rev. 1.30
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
31
March 20, 2007
HT49RV3/HT49CV3
CLR [m].i
Clear bit of data memory
Description
The bit i of the specified data memory is cleared to 0.
Operation
[m].i ¬ 0
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
CLR WDT
Clear Watchdog Timer
Description
The WDT is cleared (clears the WDT). The power down bit (PDF) and time-out bit (TO) are
cleared.
Operation
WDT ¬ 00H
PDF and TO ¬ 0
Affected flag(s)
TO
PDF
OV
Z
AC
C
0
0
¾
¾
¾
¾
CLR WDT1
Preclear Watchdog Timer
Description
Together with CLR WDT2, clears the WDT. PDF and TO are also cleared. Only execution
of this instruction without the other preclear instruction just sets the indicated flag which implies this instruction has been executed and the TO and PDF flags remain unchanged.
Operation
WDT ¬ 00H*
PDF and TO ¬ 0*
Affected flag(s)
TO
PDF
OV
Z
AC
C
0*
0*
¾
¾
¾
¾
CLR WDT2
Preclear Watchdog Timer
Description
Together with CLR WDT1, clears the WDT. PDF and TO are also cleared. Only execution
of this instruction without the other preclear instruction, sets the indicated flag which implies this instruction has been executed and the TO and PDF flags remain unchanged.
Operation
WDT ¬ 00H*
PDF and TO ¬ 0*
Affected flag(s)
TO
PDF
OV
Z
AC
C
0*
0*
¾
¾
¾
¾
CPL [m]
Complement data memory
Description
Each bit of the specified data memory is logically complemented (1¢s complement). Bits
which previously contained a 1 are changed to 0 and vice-versa.
Operation
[m] ¬ [m]
Affected flag(s)
Rev. 1.30
TO
PDF
OV
Z
AC
C
¾
¾
¾
Ö
¾
¾
32
March 20, 2007
HT49RV3/HT49CV3
CPLA [m]
Complement data memory and place result in the accumulator
Description
Each bit of the specified data memory is logically complemented (1¢s complement). Bits
which previously contained a 1 are changed to 0 and vice-versa. The complemented result
is stored in the accumulator and the contents of the data memory remain unchanged.
Operation
ACC ¬ [m]
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
Ö
¾
¾
DAA [m]
Decimal-Adjust accumulator for addition
Description
The accumulator value is adjusted to the BCD (Binary Coded Decimal) code. The accumulator is divided into two nibbles. Each nibble is adjusted to the BCD code and an internal
carry (AC1) will be done if the low nibble of the accumulator is greater than 9. The BCD adjustment is done by adding 6 to the original value if the original value is greater than 9 or a
carry (AC or C) is set; otherwise the original value remains unchanged. The result is stored
in the data memory and only the carry flag (C) may be affected.
Operation
If ACC.3~ACC.0 >9 or AC=1
then [m].3~[m].0 ¬ (ACC.3~ACC.0)+6, AC1=AC
else [m].3~[m].0 ¬ (ACC.3~ACC.0), AC1=0
and
If ACC.7~ACC.4+AC1 >9 or C=1
then [m].7~[m].4 ¬ ACC.7~ACC.4+6+AC1,C=1
else [m].7~[m].4 ¬ ACC.7~ACC.4+AC1,C=C
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
Ö
DEC [m]
Decrement data memory
Description
Data in the specified data memory is decremented by 1.
Operation
[m] ¬ [m]-1
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
Ö
¾
¾
DECA [m]
Decrement data memory and place result in the accumulator
Description
Data in the specified data memory is decremented by 1, leaving the result in the accumulator. The contents of the data memory remain unchanged.
Operation
ACC ¬ [m]-1
Affected flag(s)
Rev. 1.30
TO
PDF
OV
Z
AC
C
¾
¾
¾
Ö
¾
¾
33
March 20, 2007
HT49RV3/HT49CV3
HALT
Enter power down mode
Description
This instruction stops program execution and turns off the system clock. The contents of
the RAM and registers are retained. The WDT and prescaler are cleared. The power down
bit (PDF) is set and the WDT time-out bit (TO) is cleared.
Operation
Program Counter ¬ Program Counter+1
PDF ¬ 1
TO ¬ 0
Affected flag(s)
TO
PDF
OV
Z
AC
C
0
1
¾
¾
¾
¾
INC [m]
Increment data memory
Description
Data in the specified data memory is incremented by 1
Operation
[m] ¬ [m]+1
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
Ö
¾
¾
INCA [m]
Increment data memory and place result in the accumulator
Description
Data in the specified data memory is incremented by 1, leaving the result in the accumulator. The contents of the data memory remain unchanged.
Operation
ACC ¬ [m]+1
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
Ö
¾
¾
JMP addr
Directly jump
Description
The program counter are replaced with the directly-specified address unconditionally, and
control is passed to this destination.
Operation
Program Counter ¬addr
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
MOV A,[m]
Move data memory to the accumulator
Description
The contents of the specified data memory are copied to the accumulator.
Operation
ACC ¬ [m]
Affected flag(s)
Rev. 1.30
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
34
March 20, 2007
HT49RV3/HT49CV3
MOV A,x
Move immediate data to the accumulator
Description
The 8-bit data specified by the code is loaded into the accumulator.
Operation
ACC ¬ x
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
MOV [m],A
Move the accumulator to data memory
Description
The contents of the accumulator are copied to the specified data memory (one of the data
memories).
Operation
[m] ¬ACC
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
NOP
No operation
Description
No operation is performed. Execution continues with the next instruction.
Operation
Program Counter ¬ Program Counter+1
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
OR A,[m]
Logical OR accumulator with data memory
Description
Data in the accumulator and the specified data memory (one of the data memories) perform a bitwise logical_OR operation. The result is stored in the accumulator.
Operation
ACC ¬ ACC ²OR² [m]
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
Ö
¾
¾
OR A,x
Logical OR immediate data to the accumulator
Description
Data in the accumulator and the specified data perform a bitwise logical_OR operation.
The result is stored in the accumulator.
Operation
ACC ¬ ACC ²OR² x
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
Ö
¾
¾
ORM A,[m]
Logical OR data memory with the accumulator
Description
Data in the data memory (one of the data memories) and the accumulator perform a
bitwise logical_OR operation. The result is stored in the data memory.
Operation
[m] ¬ACC ²OR² [m]
Affected flag(s)
Rev. 1.30
TO
PDF
OV
Z
AC
C
¾
¾
¾
Ö
¾
¾
35
March 20, 2007
HT49RV3/HT49CV3
RET
Return from subroutine
Description
The program counter is restored from the stack. This is a 2-cycle instruction.
Operation
Program Counter ¬ Stack
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
RET A,x
Return and place immediate data in the accumulator
Description
The program counter is restored from the stack and the accumulator loaded with the specified 8-bit immediate data.
Operation
Program Counter ¬ Stack
ACC ¬ x
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
RETI
Return from interrupt
Description
The program counter is restored from the stack, and interrupts are enabled by setting the
EMI bit. EMI is the enable master (global) interrupt bit.
Operation
Program Counter ¬ Stack
EMI ¬ 1
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
RL [m]
Rotate data memory left
Description
The contents of the specified data memory are rotated 1 bit left with bit 7 rotated into bit 0.
Operation
[m].(i+1) ¬ [m].i; [m].i:bit i of the data memory (i=0~6)
[m].0 ¬ [m].7
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
RLA [m]
Rotate data memory left and place result in the accumulator
Description
Data in the specified data memory is rotated 1 bit left with bit 7 rotated into bit 0, leaving the
rotated result in the accumulator. The contents of the data memory remain unchanged.
Operation
ACC.(i+1) ¬ [m].i; [m].i:bit i of the data memory (i=0~6)
ACC.0 ¬ [m].7
Affected flag(s)
Rev. 1.30
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
36
March 20, 2007
HT49RV3/HT49CV3
RLC [m]
Rotate data memory left through carry
Description
The contents of the specified data memory and the carry flag are rotated 1 bit left. Bit 7 replaces the carry bit; the original carry flag is rotated into the bit 0 position.
Operation
[m].(i+1) ¬ [m].i; [m].i:bit i of the data memory (i=0~6)
[m].0 ¬ C
C ¬ [m].7
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
Ö
RLCA [m]
Rotate left through carry and place result in the accumulator
Description
Data in the specified data memory and the carry flag are rotated 1 bit left. Bit 7 replaces the
carry bit and the original carry flag is rotated into bit 0 position. The rotated result is stored
in the accumulator but the contents of the data memory remain unchanged.
Operation
ACC.(i+1) ¬ [m].i; [m].i:bit i of the data memory (i=0~6)
ACC.0 ¬ C
C ¬ [m].7
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
Ö
RR [m]
Rotate data memory right
Description
The contents of the specified data memory are rotated 1 bit right with bit 0 rotated to bit 7.
Operation
[m].i ¬ [m].(i+1); [m].i:bit i of the data memory (i=0~6)
[m].7 ¬ [m].0
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
RRA [m]
Rotate right and place result in the accumulator
Description
Data in the specified data memory is rotated 1 bit right with bit 0 rotated into bit 7, leaving
the rotated result in the accumulator. The contents of the data memory remain unchanged.
Operation
ACC.(i) ¬ [m].(i+1); [m].i:bit i of the data memory (i=0~6)
ACC.7 ¬ [m].0
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
RRC [m]
Rotate data memory right through carry
Description
The contents of the specified data memory and the carry flag are together rotated 1 bit
right. Bit 0 replaces the carry bit; the original carry flag is rotated into the bit 7 position.
Operation
[m].i ¬ [m].(i+1); [m].i:bit i of the data memory (i=0~6)
[m].7 ¬ C
C ¬ [m].0
Affected flag(s)
Rev. 1.30
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
Ö
37
March 20, 2007
HT49RV3/HT49CV3
RRCA [m]
Rotate right through carry and place result in the accumulator
Description
Data of the specified data memory and the carry flag are rotated 1 bit right. Bit 0 replaces
the carry bit and the original carry flag is rotated into the bit 7 position. The rotated result is
stored in the accumulator. The contents of the data memory remain unchanged.
Operation
ACC.i ¬ [m].(i+1); [m].i:bit i of the data memory (i=0~6)
ACC.7 ¬ C
C ¬ [m].0
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
Ö
SBC A,[m]
Subtract data memory and carry from the accumulator
Description
The contents of the specified data memory and the complement of the carry flag are subtracted from the accumulator, leaving the result in the accumulator.
Operation
ACC ¬ ACC+[m]+C
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
Ö
Ö
Ö
Ö
SBCM A,[m]
Subtract data memory and carry from the accumulator
Description
The contents of the specified data memory and the complement of the carry flag are subtracted from the accumulator, leaving the result in the data memory.
Operation
[m] ¬ ACC+[m]+C
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
Ö
Ö
Ö
Ö
SDZ [m]
Skip if decrement data memory is 0
Description
The contents of the specified data memory are decremented by 1. If the result is 0, the next
instruction is skipped. If the result is 0, the following instruction, fetched during the current
instruction execution, is discarded and a dummy cycle is replaced to get the proper instruction (2 cycles). Otherwise proceed with the next instruction (1 cycle).
Operation
Skip if ([m]-1)=0, [m] ¬ ([m]-1)
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
SDZA [m]
Decrement data memory and place result in ACC, skip if 0
Description
The contents of the specified data memory are decremented by 1. If the result is 0, the next
instruction is skipped. The result is stored in the accumulator but the data memory remains
unchanged. If the result is 0, the following instruction, fetched during the current instruction
execution, is discarded and a dummy cycle is replaced to get the proper instruction (2 cycles). Otherwise proceed with the next instruction (1 cycle).
Operation
Skip if ([m]-1)=0, ACC ¬ ([m]-1)
Affected flag(s)
Rev. 1.30
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
38
March 20, 2007
HT49RV3/HT49CV3
SET [m]
Set data memory
Description
Each bit of the specified data memory is set to 1.
Operation
[m] ¬ FFH
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
SET [m]. i
Set bit of data memory
Description
Bit i of the specified data memory is set to 1.
Operation
[m].i ¬ 1
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
SIZ [m]
Skip if increment data memory is 0
Description
The contents of the specified data memory are incremented by 1. If the result is 0, the following instruction, fetched during the current instruction execution, is discarded and a
dummy cycle is replaced to get the proper instruction (2 cycles). Otherwise proceed with
the next instruction (1 cycle).
Operation
Skip if ([m]+1)=0, [m] ¬ ([m]+1)
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
SIZA [m]
Increment data memory and place result in ACC, skip if 0
Description
The contents of the specified data memory are incremented by 1. If the result is 0, the next
instruction is skipped and the result is stored in the accumulator. The data memory remains unchanged. If the result is 0, the following instruction, fetched during the current instruction execution, is discarded and a dummy cycle is replaced to get the proper
instruction (2 cycles). Otherwise proceed with the next instruction (1 cycle).
Operation
Skip if ([m]+1)=0, ACC ¬ ([m]+1)
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
SNZ [m].i
Skip if bit i of the data memory is not 0
Description
If bit i of the specified data memory is not 0, the next instruction is skipped. If bit i of the data
memory is not 0, the following instruction, fetched during the current instruction execution,
is discarded and a dummy cycle is replaced to get the proper instruction (2 cycles). Otherwise proceed with the next instruction (1 cycle).
Operation
Skip if [m].i¹0
Affected flag(s)
Rev. 1.30
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
39
March 20, 2007
HT49RV3/HT49CV3
SUB A,[m]
Subtract data memory from the accumulator
Description
The specified data memory is subtracted from the contents of the accumulator, leaving the
result in the accumulator.
Operation
ACC ¬ ACC+[m]+1
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
Ö
Ö
Ö
Ö
SUBM A,[m]
Subtract data memory from the accumulator
Description
The specified data memory is subtracted from the contents of the accumulator, leaving the
result in the data memory.
Operation
[m] ¬ ACC+[m]+1
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
Ö
Ö
Ö
Ö
SUB A,x
Subtract immediate data from the accumulator
Description
The immediate data specified by the code is subtracted from the contents of the accumulator, leaving the result in the accumulator.
Operation
ACC ¬ ACC+x+1
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
Ö
Ö
Ö
Ö
SWAP [m]
Swap nibbles within the data memory
Description
The low-order and high-order nibbles of the specified data memory (1 of the data memories) are interchanged.
Operation
[m].3~[m].0 « [m].7~[m].4
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
SWAPA [m]
Swap data memory and place result in the accumulator
Description
The low-order and high-order nibbles of the specified data memory are interchanged, writing the result to the accumulator. The contents of the data memory remain unchanged.
Operation
ACC.3~ACC.0 ¬ [m].7~[m].4
ACC.7~ACC.4 ¬ [m].3~[m].0
Affected flag(s)
Rev. 1.30
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
40
March 20, 2007
HT49RV3/HT49CV3
SZ [m]
Skip if data memory is 0
Description
If the contents of the specified data memory are 0, the following instruction, fetched during
the current instruction execution, is discarded and a dummy cycle is replaced to get the
proper instruction (2 cycles). Otherwise proceed with the next instruction (1 cycle).
Operation
Skip if [m]=0
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
SZA [m]
Move data memory to ACC, skip if 0
Description
The contents of the specified data memory are copied to the accumulator. If the contents is
0, the following instruction, fetched during the current instruction execution, is discarded
and a dummy cycle is replaced to get the proper instruction (2 cycles). Otherwise proceed
with the next instruction (1 cycle).
Operation
Skip if [m]=0
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
SZ [m].i
Skip if bit i of the data memory is 0
Description
If bit i of the specified data memory is 0, the following instruction, fetched during the current
instruction execution, is discarded and a dummy cycle is replaced to get the proper instruction (2 cycles). Otherwise proceed with the next instruction (1 cycle).
Operation
Skip if [m].i=0
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
TABRDC [m]
Move the ROM code (current page) to TBLH and data memory
Description
The low byte of ROM code (current page) addressed by the table pointer (TBLP) is moved
to the specified data memory and the high byte transferred to TBLH directly.
Operation
[m] ¬ ROM code (low byte)
TBLH ¬ ROM code (high byte)
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
TABRDL [m]
Move the ROM code (last page) to TBLH and data memory
Description
The low byte of ROM code (last page) addressed by the table pointer (TBLP) is moved to
the data memory and the high byte transferred to TBLH directly.
Operation
[m] ¬ ROM code (low byte)
TBLH ¬ ROM code (high byte)
Affected flag(s)
Rev. 1.30
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
41
March 20, 2007
HT49RV3/HT49CV3
XOR A,[m]
Logical XOR accumulator with data memory
Description
Data in the accumulator and the indicated data memory perform a bitwise logical Exclusive_OR operation and the result is stored in the accumulator.
Operation
ACC ¬ ACC ²XOR² [m]
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
Ö
¾
¾
XORM A,[m]
Logical XOR data memory with the accumulator
Description
Data in the indicated data memory and the accumulator perform a bitwise logical Exclusive_OR operation. The result is stored in the data memory. The 0 flag is affected.
Operation
[m] ¬ ACC ²XOR² [m]
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
Ö
¾
¾
XOR A,x
Logical XOR immediate data to the accumulator
Description
Data in the accumulator and the specified data perform a bitwise logical Exclusive_OR operation. The result is stored in the accumulator. The 0 flag is affected.
Operation
ACC ¬ ACC ²XOR² x
Affected flag(s)
Rev. 1.30
TO
PDF
OV
Z
AC
C
¾
¾
¾
Ö
¾
¾
42
March 20, 2007
HT49RV3/HT49CV3
Package Information
52-pin QFP (14´14) Outline Dimensions
C
H
D
3 9
G
2 7
I
2 6
4 0
F
A
B
E
1 4
5 2
K
J
1
Symbol
Rev. 1.30
1 3
Dimensions in mm
Min.
Nom.
Max.
A
17.3
¾
17.5
B
13.9
¾
14.1
C
17.3
¾
17.5
D
13.9
¾
14.1
E
¾
1
¾
F
¾
0.4
¾
G
2.5
¾
3.1
H
¾
¾
3.4
I
¾
0.1
¾
J
0.73
¾
1.03
K
0.1
¾
0.2
a
0°
¾
7°
43
March 20, 2007
HT49RV3/HT49CV3
Holtek Semiconductor Inc. (Headquarters)
No.3, Creation Rd. II, Science Park, Hsinchu, Taiwan
Tel: 886-3-563-1999
Fax: 886-3-563-1189
http://www.holtek.com.tw
Holtek Semiconductor Inc. (Taipei Sales Office)
4F-2, No. 3-2, YuanQu St., Nankang Software Park, Taipei 115, Taiwan
Tel: 886-2-2655-7070
Fax: 886-2-2655-7373
Fax: 886-2-2655-7383 (International sales hotline)
Holtek Semiconductor Inc. (Shanghai Sales Office)
7th Floor, Building 2, No.889, Yi Shan Rd., Shanghai, China 200233
Tel: 86-21-6485-5560
Fax: 86-21-6485-0313
http://www.holtek.com.cn
Holtek Semiconductor Inc. (Shenzhen Sales Office)
5/F, Unit A, Productivity Building, Cross of Science M 3rd Road and Gaoxin M 2nd Road, Science Park, Nanshan District,
Shenzhen, China 518057
Tel: 86-755-8616-9908, 86-755-8616-9308
Fax: 86-755-8616-9722
Holtek Semiconductor Inc. (Beijing Sales Office)
Suite 1721, Jinyu Tower, A129 West Xuan Wu Men Street, Xicheng District, Beijing, China 100031
Tel: 86-10-6641-0030, 86-10-6641-7751, 86-10-6641-7752
Fax: 86-10-6641-0125
Holtek Semiconductor Inc. (Chengdu Sales Office)
709, Building 3, Champagne Plaza, No.97 Dongda Street, Chengdu, Sichuan, China 610016
Tel: 86-28-6653-6590
Fax: 86-28-6653-6591
Holtek Semiconductor (USA), Inc. (North America Sales Office)
46729 Fremont Blvd., Fremont, CA 94538
Tel: 1-510-252-9880
Fax: 1-510-252-9885
http://www.holmate.com
Copyright Ó 2007 by HOLTEK SEMICONDUCTOR INC.
The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek assumes no responsibility arising from the use of the specifications described. The applications mentioned herein are used
solely for the purpose of illustration and Holtek makes no warranty or representation that such applications will be suitable
without further modification, nor recommends the use of its products for application that may present a risk to human life
due to malfunction or otherwise. Holtek¢s products are not authorized for use as critical components in life support devices
or systems. Holtek reserves the right to alter its products without prior notification. For the most up-to-date information,
please visit our web site at http://www.holtek.com.tw.
Rev. 1.30
44
March 20, 2007