PHILIPS P89V51RD2FBC

P89V51RD2
8-bit 80C51 5 V low power 64 kB Flash microcontroller
with 1 kB RAM
Rev. 01 — 01 March 2004
Product data
1. General description
The P89V51RD2 is an 80C51 microcontroller with 64 kB Flash and 1024 bytes of
data RAM.
A key feature of the P89V51RD2 is its X2 mode option. The design engineer can
choose to run the application with the conventional 80C51 clock rate (12 clocks per
machine cycle) or select the X2 mode (6 clocks per machine cycle) to achieve twice
the throughput at the same clock frequency. Another way to benefit from this feature
is to keep the same performance by reducing the clock frequency by half, thus
dramatically reducing the EMI.
The Flash program memory supports both parallel programming and in serial
In-System Programming (ISP). Parallel programming mode offers gang-programming
at high speed, reducing programming costs and time to market. ISP allows a device
to be reprogrammed in the end product under software control. The capability to
field/update the application firmware makes a wide range of applications possible.
The P89V51RD2 is also In-Application Programmable (IAP), allowing the Flash
program memory to be reconfigured even while the application is running.
2. Features
■ 80C51 Central Processing Unit
■ 5 V Operating voltage from 0 to 40 MHz
■ 64 kB of on-chip Flash program memory with ISP (In-System Programming) and
IAP (In-Application Programming)
■ Supports 12-clock (default) or 6-clock mode selection via software or ISP
■ SPI (Serial Peripheral Interface) and enhanced UART
■ PCA (Programmable Counter Array) with PWM and Capture/Compare functions
■ Four 8-bit I/O ports with three high-current Port 1 pins (16 mA each)
■ Three 16-bit timers/counters
■ Programmable Watchdog timer (WDT)
■ Eight interrupt sources with four priority levels
■ Second DPTR register
■ Low EMI mode (ALE inhibit)
■ TTL- and CMOS-compatible logic levels
P89V51RD2
Philips Semiconductors
8-bit microcontrollers with 80C51 core
■ Brown-out detection
■ Low power modes
◆ Power-down mode with external interrupt wake-up
◆ Idle mode
■ PDIP40, PLCC44 and TQFP44 packages
3. Ordering information
Table 1:
Ordering information
Type number
Package
Version
Name
Description
P89V51RD2FA
PLCC44
plastic leaded chip carrier; 44 leads
SOT187-2
P89V51RD2FBC
TQFP44
plastic thin quad flat package; 44 leads
SOT376-1
P89V51RD2BN
PDIP40
plastic dual in-line package; 40 leads
SOT129-1
3.1 Ordering options
Table 2:
Ordering options
Type number
Temperature range
Frequency
P89V51RD2FA
−40 °C to +85 °C
0 to 40 MHz
P89V51RD2FBC
−40 °C to +85 °C
P89V51RD2BN
0 °C to +70 °C
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
9397 750 12964
Product data
Rev. 01 — 01 March 2004
2 of 75
P89V51RD2
Philips Semiconductors
8-bit microcontrollers with 80C51 core
4. Block diagram
HIGH PERFORMANCE
80C51 CPU
64 kB
CODE FLASH
UART
INTERNAL
BUS
1 kB
DATA RAM
SPI
PORT 3
TIMER 0
TIMER 1
PORT 2
TIMER 2
PCA
PROGRAMMABLE
COUNTER ARRAY
PORT 1
PORT 0
WATCHDOG TIMER
CRYSTAL
OR
RESONATOR
OSCILLATOR
002aaa506
Fig 1. P89V51RD2 block diagram.
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
9397 750 12964
Product data
Rev. 01 — 01 March 2004
3 of 75
P89V51RD2
Philips Semiconductors
8-bit microcontrollers with 80C51 core
5. Pinning information
40 P0.3/AD3
41 P0.2/AD2
42 P0.1/AD1
43 P0.0/AD0
44 VCC
1 NC
2 P1.0/T2
3 P1.1/T2EX
4 P1.2/ECI
5 P1.3/CEX0
6 P1.4/SS/CEX1
5.1 Pinning
CEX2/MOSI/P1.5
7
39 P0.4/AD4
CEX3/MISO/P1.6
8
38 P0.5/AD5
CEX4/SCK/P1.7
9
37 P0.6/AD6
RST 10
36 P0.7/AD7
RXD/P3.0 11
35 EA
P89V51RD2FA
NC 12
34 NC
A12/P2.4 28
A11/P2.3 27
29 P2.5/A13
A10/P2.2 26
T1/P3.5 17
A9/P2.1 25
30 P2.6/A14
A8/P2.0 24
T0/P3.4 16
NC 23
31 P2.7/A15
VSS 22
INT1/P3.3 15
XTAL1 21
32 PSEN
XTAL2 20
INT0/P3.2 14
RD/P3.7 19
33 ALE/PROG
WR/P3.6 18
TXD/P3.1 13
002aaa810
Fig 2. PLCC44 pin configuration.
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
9397 750 12964
Product data
Rev. 01 — 01 March 2004
4 of 75
P89V51RD2
Philips Semiconductors
8-bit microcontrollers with 80C51 core
handbook, halfpage
40 VDD
T2/P1.0 1
39 P0.0/AD0
ECI/P1.2 3
38 P0.1/AD1
CEX0/P1.3 4
37 P0.2/AD2
CEX1/SS/P1.4 5
36 P0.3/AD3
CEX2/MOSI/P1.5 6
35 P0.4/AD4
CEX3/MISO/P1.6 7
34 P0.5/AD5
CEX4/SCK/P1.7 8
33 P0.6/AD6
RST 9
32 P0.7/AD7
RXD/P3.0 10
TXD/P3.1 11
INT0/P3.2 12
P89V51RD2BN
T2EX/P1.1 2
31 EA
30 ALE/PROG
29 PSEN
INT1/P3.3 13
28 P2.7/A15
T0/P3.4 14
27 P2.6/A14
T1/P3.5 15
26 P2.5/A13
WR/P3.6 16
25 P2.4/A12
RD/P3.7 17
24 P2.3/A11
XTAL2 18
23 P2.2/A10
XTAL1 19
22 P2.1/A9
VSS 20
21 P2.0/A8
002aaa811
Fig 3. PDIP40 pin configuration.
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
9397 750 12964
Product data
Rev. 01 — 01 March 2004
5 of 75
P89V51RD2
Philips Semiconductors
34 P0.3/AD3
35 P0.2/AD2
36 P0.1/AD1
37 P0.0/AD0
38 VDD
39 NC
40 P1.0/T2
41 P1.1/T2EX
42 P1.2/ECI
43 P1.3/CEX0
44 P1.4/SS/CEX1
8-bit microcontrollers with 80C51 core
CEX2/MOSI/P1.5
1
33 P0.4/AD4
CEX3/MISO/P1.6
2
32 P0.5/AD5
CEX4/SCK/P1.7
3
31 P0.6/AD6
RST
4
30 P0.7/AD7
RXD/P3.0
5
29 EA
NC
6
TXD/P3.1
7
27 ALE/PROG
INT0/P3.2
8
26 PSEN
INT1/P3.3
9
25 P2.7/A15
T0/P3.4 10
24 P2.6/A14
T1/P3.5 11
23 P2.5/A13
A12/P2.4 22
A11/P2.3 21
28 NC
A10/P2.2 20
A9/P2.1 19
A8/P2.0 18
NC 17
VSS 16
XTAL1 15
XTAL2 14
RD/P3.7 13
WR/P3.6 12
P89V51RD2FBC
002aaa812
Fig 4. TQFP44 pin configuration.
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
9397 750 12964
Product data
Rev. 01 — 01 March 2004
6 of 75
P89V51RD2
Philips Semiconductors
8-bit microcontrollers with 80C51 core
5.2 Pin description
Table 3:
P89V51RD2 pin description
Symbol
Pin
Type
Description
Port 0: Port 0 is an 8-bit open drain bi-directional I/O
port. Port 0 pins that have ‘1’s written to them float, and
in this state can be used as high-impedance inputs.
Port 0 is also the multiplexed low-order address and
data bus during accesses to external code and data
memory. In this application, it uses strong internal
pull-ups when transitioning to ‘1’s. Port 0 also receives
the code bytes during the external host mode
programming, and outputs the code bytes during the
external host mode verification. External pull-ups are
required during program verification or as a general
purpose I/O port.
DIP40
TQFP44
PLCC44
P0.0 to
P0.7
39-32
37-30
43-36
I/O
P1.0 to
P1.7
1-8
40-44, 1-3
2-9
I/O with
Port 1: Port 1 is an 8-bit bi-directional I/O port with
internal pull-up internal pull-ups. The Port 1 pins are pulled high by the
internal pull-ups when ‘1’s are written to them and can
be used as inputs in this state. As inputs, Port 1 pins that
are externally pulled LOW will source current (IIL)
because of the internal pull-ups. P1.5, P1.6, P1.7 have
high current drive of 16 mA. Port 1 also receives the
low-order address bytes during the external host mode
programming and verification.
P1.0
1
40
2
I/O
T2: External count input to Timer/Counter 2 or Clock-out
from Timer/Counter 2
P1.1
2
41
3
I
T2EX: Timer/Counter 2 capture/reload trigger and
direction control
P1.2
3
42
4
I
ECI: External clock input. This signal is the external
clock input for the PCA.
P1.3
4
43
5
I/O
CEX0: Capture/compare external I/O for PCA Module 0.
Each capture/compare module connects to a Port 1 pin
for external I/O. When not used by the PCA, this pin can
handle standard I/O.
P1.4
5
44
6
I/O
SS: Slave port select input for SPI
CEX1: Capture/compare external I/O for PCA Module 1
P1.5
6
1
7
I/O
MOSI: Master Output Slave Input for SPI
CEX2: Capture/compare external I/O for PCA Module 2
P1.6
7
2
8
I/O
MISO: Master Input Slave Output for SPI
CEX3: Capture/compare external I/O for PCA Module 3
P1.7
8
3
9
I/O
SCK: Master Output Slave Input for SPI
CEX4: Capture/compare external I/O for PCA Module 4
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
9397 750 12964
Product data
Rev. 01 — 01 March 2004
7 of 75
P89V51RD2
Philips Semiconductors
8-bit microcontrollers with 80C51 core
Table 3:
P89V51RD2 pin description…continued
Symbol
Pin
Type
Description
24-31
I/O
with internal
pull-up
Port 2: Port 2 is an 8-bit bi-directional I/O port with
internal pull-ups. Port 2 pins are pulled HIGH by the
internal pull-ups when ‘1’s are written to them and can
be used as inputs in this state. As inputs, Port 2 pins that
are externally pulled LOW will source current (IIL)
because of the internal pull-ups. Port 2 sends the
high-order address byte during fetches from external
program memory and during accesses to external Data
Memory that use 16-bit address (MOVX@DPTR). In this
application, it uses strong internal pull-ups when
transitioning to ‘1’s. Port 2 also receives some control
signals and a partial of high-order address bits during
the external host mode programming and verification.
5, 7-13
11, 13-19
I/O
with internal
pull-up
Port 3: Port 3 is an 8-bit bidirectional I/O port with
internal pull-ups. Port 3 pins are pulled HIGH by the
internal pull-ups when ‘1’s are written to them and can
be used as inputs in this state. As inputs, Port 3 pins that
are externally pulled LOW will source current (IIL)
because of the internal pull-ups. Port 3 also receives
some control signals and a partial of high-order address
bits during the external host mode programming and
verification.
10
5
11
I
RXD: serial input port
P3.1
11
7
13
O
TXD: serial output port
P3.2
12
8
14
I
INT0: external interrupt 0 input
P3.3
13
9
15
I
INT1: external interrupt 1 input
P3.4
14
10
16
I
T0: external count input to Timer/Counter 0
P3.5
15
11
17
I
T1: external count input to Timer/Counter 1
P3.6
16
12
18
O
WR: external data memory write strobe
P3.7
17
13
19
O
RD: external data memory read strobe
PSEN
29
26
32
I/O
Program Store Enable: PSEN is the read strobe for
external program memory. When the device is executing
from internal program memory, PSEN is inactive
(HIGH). When the device is executing code from
external program memory, PSEN is activated twice each
machine cycle, except that two PSEN activations are
skipped during each access to external data memory. A
forced HIGH-to-LOW input transition on the PSEN pin
while the RST input is continually held HIGH for more
than 10 machine cycles will cause the device to enter
external host mode programming.
RST
9
4
10
I
Reset: While the oscillator is running, a HIGH logic state
on this pin for two machine cycles will reset the device. If
the PSEN pin is driven by a HIGH-to-LOW input
transition while the RST input pin is held HIGH, the
device will enter the external host mode, otherwise the
device will enter the normal operation mode.
DIP40
TQFP44
PLCC44
P2.0 to
P2.7
21-28
18-25
P3.0 to
P3.7
10-17
P3.0
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
9397 750 12964
Product data
Rev. 01 — 01 March 2004
8 of 75
P89V51RD2
Philips Semiconductors
8-bit microcontrollers with 80C51 core
Table 3:
P89V51RD2 pin description…continued
Symbol
Pin
Type
Description
35
I
External Access Enable: EA must be connected to VSS
in order to enable the device to fetch code from the
external program memory. EA must be strapped to VDD
for internal program execution. However, Security lock
level 4 will disable EA, and program execution is only
possible from internal program memory. The EA pin can
tolerate a high voltage of 12 V.
27
33
I/O
Address Latch Enable: ALE is the output signal for
latching the low byte of the address during an access to
external memory. This pin is also the programming
pulse input (PROG) for flash programming. Normally the
ALE[1] is emitted at a constant rate of 1⁄6 the crystal
frequency[2] and can be used for external timing and
clocking. One ALE pulse is skipped during each access
to external data memory. However, if AO is set to ‘1’,
ALE is disabled.
-
6, 17, 28,
39
1, 12, 23,
34
I/O
No Connect
XTAL1
19
15
21
I
Crystal 1: Input to the inverting oscillator amplifier and
input to the internal clock generator circuits.
XTAL2
18
14
20
O
Crystal 2: Output from the inverting oscillator amplifier.
VDD
40
38
44
I
Power supply
VSS
20
16
22
I
Ground
DIP40
TQFP44
PLCC44
EA
31
29
ALE/
PROG
30
NC
[1]
[2]
ALE loading issue: When ALE pin experiences higher loading (>30 pF) during the reset, the microcontroller may accidentally enter into
modes other than normal working mode. The solution is to add a pull-up resistor of 3 kΩ to 50 kΩ to VDD, e.g., for ALE pin.
For 6-clock mode, ALE is emitted at 1⁄3 of crystal frequency.
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
9397 750 12964
Product data
Rev. 01 — 01 March 2004
9 of 75
P89V51RD2
Philips Semiconductors
8-bit microcontrollers with 80C51 core
6. Special function registers
Remark: Special Function Registers (SFRs) accesses are restricted in the following
ways:
• User must not attempt to access any SFR locations not defined.
• Accesses to any defined SFR locations must be strictly for the functions for the
SFRs.
• SFR bits labeled ‘-’, ‘0’ or ‘1’ can only be written and read as follows:
– ‘-’ Unless otherwise specified, must be written with ‘0’, but can return any value
when read (even if it was written with ‘0’). It is a reserved bit and may be used in
future derivatives.
– ‘0’ must be written with ‘0’, and will return a ‘0’ when read.
– ‘1’ must be written with ‘1’, and will return a ‘1’ when read.
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
9397 750 12964
Product data
Rev. 01 — 01 March 2004
10 of 75
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Philips Semiconductors
9397 750 12964
Product data
Table 4:
Special function registers
* indicates SFRs that are bit addressable.
Name
Description
SFR
addr.
Bit address
Bit functions and addresses
MSB
LSB
E7
E6
E5
E4
-
ACC*
Accumulator
E0H
AUXR
Auxiliary function register
8EH
-
-
-
AUXR1
Auxiliary function register 1
A2H
-
-
-
F7
F6
F5
Bit address
E3
E2
E1
E0
-
-
EXTRAM
AO
GF2
0
-
DPS
F4
F3
F2
F1
F0
Rev. 01 — 01 March 2004
F0H
CCAP0H
Module 0 Capture HIGH
FAH
CCAP1H
Module 1 Capture HIGH
FBH
CCAP2H
Module 2 Capture HIGH
FCH
CCAP3H
Module 3 Capture HIGH
FDH
CCAP4H
Module 4 Capture HIGH
FEH
CCAP0L
Module 0 Capture LOW
EAH
CCAP1L
Module 1 Capture LOW
EBH
CCAP2L
Module 2 Capture LOW
ECH
CCAP3L
Module 3 Capture LOW
EDH
CCAP4L
Module 4 Capture LOW
EEH
CCAPM0
Module 0 Mode
DAH
-
ECOM_0
CAPP_0
CAPN_0
MAT_0
TOG_0
PWM_0
ECCF_0
CCAPM1
Module 1 Mode
DBH
-
ECOM_1
CAPP_1
CAPN_1
MAT_1
TOG_1
PWM_1
ECCF_1
CCAPM2
Module 2 Mode
DCH
-
ECOM_2
CAPP_2
CAPN_2
MAT_2
TOG_2
PWM_2
ECCF_2
CCAPM3
Module 3 Mode
DDH
-
ECOM_3
CAPP_3
CAPN_3
MAT_3
TOG_3
PWM_3
ECCF_3
CCAPM4
Module 4 Mode
DEH
-
ECOM_4
CAPP_4
CAPN_4
MAT_4
TOG_4
PWM_4
ECCF_4
DF
DE
DD
DC
DB
DA
D9
D8
CF
CR
-
CCF4
CCF3
CCF2
CCF1
CCF0
CIDL
WDTE
-
-
-
CPS1
CPS0
ECF
Bit address
CCON*
PCA Counter Control
D8H
CH
PCA Counter HIGH
F9H
CL
PCA Counter LOW
E9H
CMOD
PCA Counter Mode
D9H
DPTR
Data Pointer (2 bytes)
DPH
Data Pointer HIGH
83H
DPL
Data Pointer LOW
82H
P89V51RD2
B register
8-bit microcontrollers with 80C51 core
11 of 75
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
B*
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Name
FST
Description
SFR
addr.
Flash Status Register
B6
Bit address
IEN0*
Interrupt Enable 0
A8H
Bit address
IEN1*
Interrupt Enable 1
E8H
Bit address
Bit functions and addresses
MSB
LSB
-
SB
-
-
EDC
-
-
-
AF
AE
AD
AC
AB
AA
A9
A8
EA
EC
ET2
ES0
ET1
EX1
ET0
EX0
EF
EE
ED
EC
EB
EA
E9
E8
-
-
-
-
EBO
BF
BE
BD
BC
BB
BA
B9
B8
IP0*
Interrupt Priority
B8H
-
PPC
PT2
PS
PT1
PX1
PT0
PX0
IP0H
Interrupt Priority 0 HIGH
B7H
-
PPCH
PT2H
PSH
PT1H
PX1H
PT0H
PX0H
FF
FE
FD
FC
FB
FA
F9
F8
IP1*
Interrupt Priority 1
F8H
-
-
-
-
PBO
IP1H
Interrupt Priority 1 HIGH
F7H
-
-
-
-
PBOH
B1H
-
-
-
-
-
-
-
BSEL
Bit address
Rev. 01 — 01 March 2004
FCF
Bit address
P0*
Port 0
80H
Bit address
Port 1
P2*
Port 2
90H
Bit address
PCON
Power Control Register
85
84
83
82
81
80
AD5
AD4
AD3
AD2
AD1
AD0
97
96
95
94
93
92
91
90
CEX4/
SPICLK
CEX3/
MISO
CEX2/
MOSI
CEX1/SS
CEX0
ECI
T2EX
T2
A7
A6
A5
A4
A3
A2
A1
A0
A14
A13
A12
A11
A10
A9
A8
B7
B6
B5
B4
B3
B2
B1
B0
B0H
RD
WR
T1
T0
INT1
INT0
TxD
RxD
87H
SMOD1
SMOD0
BOF
POF
GF1
GF0
PD
IDL
D7
D6
D5
D4
D3
D2
D1
D0
CY
AC
F0
RS1
RS0
OV
F1
P
9F
9E
9D
9C
9B
9A
99
98
SM0/FE_
SM1
SM2
REN
TB8
RB8
TI
RI
Bit address
PSW*
Program Status Word
D0H
RCAP2H
Timer2 Capture HIGH
CBH
RCAP2L
Timer2 Capture LOW
CAH
Bit address
SCON*
Serial Port Control
98H
SBUF
Serial Port Data Buffer Register
99H
P89V51RD2
12 of 75
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Port 3
86
AD6
A15
A0H
Bit address
P3*
87
AD7
8-bit microcontrollers with 80C51 core
P1*
Philips Semiconductors
9397 750 12964
Product data
Table 4:
Special function registers…continued
* indicates SFRs that are bit addressable.
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xxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxx xxx
Name
Description
SFR
addr.
SADDR
Serial Port Address Register
A9H
SADEN
Serial Port Address Enable
B9H
Bit address
Bit functions and addresses
MSB
LSB
87[1]
86[1]
85[1]
84[1]
83[1]
82[1]
81[1]
80[1]
SPCTL
SPI Control Register
D5H
SPIE
SPEN
DORD
MSTR
CPOL
CPHA
SPR1
SPR0
SPCFG
SPI Configuration Register
AAH
SPIF
SPWCOL
-
-
-
-
-
-
SPDAT
SPI Data
86H
SP
Stack Pointer
81H
8F
8E
8D
8C
8B
8A
89
88
TF1
TR1
TF0
TR0
IE1
IT1
IE0
IT0
CF
CE
CD
CC
CB
CA
C9
C8
TCLK
EXEN2
TR2
C/T2
CP/RL2
T2OE
DCEN
Bit address
TCON*
Timer Control Register
88H
Bit address
Rev. 01 — 01 March 2004
Timer2 Control Register
C8H
TF2
EXF2
RCLK
T2MOD
Timer2 Mode Control
C9H
-
-
ENT2
TH0
Timer 0 HIGH
8CH
TH1
Timer 1 HIGH
8DH
TH2
Timer 2 HIGH
CDH
TL0
Timer 0 LOW
8AH
TL1
Timer 1 LOW
8BH
TL2
Timer 2 LOW
CCH
TMOD
Timer 0 and 1 Mode
89H
GATE
C/T
M1
M0
GATE
C/T
M1
M0
WDTC
Watchdog Timer Control
C0H
-
-
-
WDOUT
WDRE
WDTS
WDT
SWDT
WDTD
Watchdog Timer Data/Reload
85H
P89V51RD2
Unimplemented bits in SFRs (labeled ’-’) are ‘X’s (unknown) at all times. Unless otherwise specified, ‘1’s should not be written to these bits since they may be used for other
purposes in future derivatives. The reset values shown for these bits are ‘0’s although they are unknown when read.
8-bit microcontrollers with 80C51 core
13 of 75
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[1]
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Table 4:
Special function registers…continued
* indicates SFRs that are bit addressable.
P89V51RD2
Philips Semiconductors
8-bit microcontrollers with 80C51 core
7. Functional description
7.1 Memory organization
The device has separate address spaces for program and data memory.
7.1.1
Flash program memory
There are two internal flash memory blocks in the device. Block 0 has 64 kbytes and
contains the user’s code. Block 1 contains the Philips-provided ISP/IAP routines and
may be enabled such that it overlays the first 8 kbytes of the user code memory.
The 64 kB Block 0 is organized as 512 sectors, each sector consists of 128 bytes.
Access to the IAP routines may be enabled by clearing the BSEL bit in the FCF
register. However, caution must be taken when dynamically changing the BSEL bit.
Since this will cause different physical memory to be mapped to the logical program
address space, the user must avoid clearing the BSEL bit when executing user code
within the address range 0000H to 1FFFH.
7.1.2
Data RAM memory
The data RAM has 1024 bytes of internal memory. The device can also address up to
64 kB for external data memory.
7.1.3
Expanded data RAM addressing
The P89V51RD2 has 1 kB of RAM. See Figure 5 “Internal and external data memory
structure.” on page 17.
The device has four sections of internal data memory:
1. The lower 128 bytes of RAM (00H to 7FH) are directly and indirectly addressable.
2. The higher 128 bytes of RAM (80H to FFH) are indirectly addressable.
3. The special function registers (80H to FFH) are directly addressable only.
4. The expanded RAM of 768 bytes (00H to 2FFH) is indirectly addressable by the
move external instruction (MOVX) and clearing the EXTRAM bit. (See ‘Auxiliary
Register (AUXR) in Section 6 “Special function registers” on page 10)
Since the upper 128 bytes occupy the same addresses as the SFRs, the RAM must
be accessed indirectly. The RAM and SFRs space are physically separate even
though they have the same addresses.
Table 5:
AUXR - Auxiliary register (address 8EH) bit allocation
Not bit addressable; Reset value 00H
Bit
7
6
5
4
3
2
1
0
Symbol
-
-
-
-
-
-
EXTRAM
AO
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Table 6:
AUXR - Auxiliary register (address 8EH) bit description
Bit
Symbol
Description
7 to 2
-
Reserved for future use. Should be set to ‘0’ by user programs.
1
EXTRAM
Internal/External RAM access using MOVX @Ri/@DPTR.
When ‘0’, core attempts to access internal XRAM with address
specified in MOVX instruction. If address supplied with this
instruction exceeds on-chip available XRAM, off-chip XRAM is
going to be selected and accessed.
When ‘1’, every MOVX @Ri/@DPTR instruction targets external
data memory by default.
0
AO
ALE off: disables/enables ALE. AO = 0 results in ALE emitted at a
constant rate of 1⁄2 the oscillator frequency. In case of AO = 1, ALE
is active only during a MOVX or MOVC.
When instructions access addresses in the upper 128 bytes (above 7FH), the MCU
determines whether to access the SFRs or RAM by the type of instruction given. If it
is indirect, then RAM is accessed. If it is direct, then an SFR is accessed. See the
examples below.
Indirect Access:
MOV@R0, #data; R0 contains 90H
Register R0 points to 90H which is located in the upper address range. Data in
‘#data’ is written to RAM location 90H rather than port 1.
Direct Access:
MOV90H, #data; write data to P1
Data in ‘#data’ is written to port 1. Instructions that write directly to the address write
to the SFRs.
To access the expanded RAM, the EXTRAM bit must be cleared and MOVX
instructions must be used. The extra 768 bytes of memory is physically located on the
chip and logically occupies the first 768 bytes of external memory (addresses 000H to
2FFH).
When EXTRAM = 0, the expanded RAM is indirectly addressed using the MOVX
instruction in combination with any of the registers R0, R1 of the selected bank or
DPTR. Accessing the expanded RAM does not affect ports P0, P3.6 (WR), P3.7
(RD), or P2. With EXTRAM = 0, the expanded RAM can be accessed as in the
following example.
Expanded RAM Access (Indirect Addressing only):
MOVX@DPTR, A DPTR contains 0A0H
DPTR points to 0A0H and data in ‘A’ is written to address 0A0H of the expanded
RAM rather than external memory. Access to external memory higher than 2FFH
using the MOVX instruction will access external memory (0300H to FFFFH) and will
perform in the same way as the standard 8051, with P0 and P2 as data/address bus,
and P3.6 and P3.7 as write and read timing signals.
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When EXTRAM = 1, MOVX @Ri and MOVX @DPTR will be similar to the standard
8051. Using MOVX @Ri provides an 8-bit address with multiplexed data on Port 0.
Other output port pins can be used to output higher order address bits. This provides
external paging capabilities. Using MOVX @DPTR generates a 16-bit address. This
allows external addressing up the 64 kB. Port 2 provides the high-order eight address
bits (DPH), and Port 0 multiplexes the low order eight address bits (DPL) with data.
Both MOVX @Ri and MOVX @DPTR generates the necessary read and write
signals (P3.6 - WR and P3.7 - RD) for external memory use. Table 7 shows external
data memory RD, WR operation with EXTRAM bit.
The stack pointer (SP) can be located anywhere within the 256 bytes of internal RAM
(lower 128 bytes and upper 128 bytes). The stack pointer may not be located in any
part of the expanded RAM.
Table 7:
External data memory RD, WR with EXTRAM bit
AUXR
MOVX @DPTR, A or MOVX A,
@DPTR
ADDR < 0300H
ADDR ≥ 0300H
EXTRAM = 0
RD/WR not
asserted
RD/WR asserted RD/WR not asserted
EXTRAM = 1
RD/WR asserted RD/WR asserted RD/WR asserted
[1]
ADDR = any
Access limited to ERAM address within 0 to 0FFH; cannot access 100H to 02FFH.
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MOVX @Ri, A or MOVX A, @Ri
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8-bit microcontrollers with 80C51 core
2FFH
FFH
EXPANDED
RAM
768 Bytes
UPPER 128 BYTES
INTERNAL RAM
80H
7FH
000H
(INDIRECT
ADDRESSING)
00H
FFH
(INDIRECT
ADDRESSING)
80H
(DIRECT
ADDRESSING)
SPECIAL
FUNCTION
REGISTERS (SFRs)
LOWER 128 BYTES
INTERNAL RAM
(INDIRECT & DIRECT
ADDRESSING)
FFFFH
(INDIRECT
ADDRESSING)
FFFFH
(INDIRECT
ADDRESSING)
EXTERNAL
DATA
MEMORY
EXTERNAL
DATA
MEMORY
0300H
2FFH
EXPANDED RAM
0000H
000H
EXTRAM = 0
EXTRAM = 1
002aaa517
Fig 5. Internal and external data memory structure.
7.1.4
Dual data pointers
The device has two 16-bit data pointers. The DPTR Select (DPS) bit in AUXR1
determines which of the two data pointers is accessed. When DPS = 0, DPTR0 is
selected; when DPS = 1, DPTR1 is selected. Quickly switching between the two data
pointers can be accomplished by a single INC instruction on AUXR1 (see Figure 6).
AUXR1 / bit0
DPS
DPTR1
DPS = 0 → DPTR0
DPS = 1 → DPTR1
DPTR0
DPH
83H
DPL
82H
external data memory
002aaa518
Fig 6. Dual data pointer organization.
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Table 8:
AUXR1 - Auxiliary register 1 (address A2H) bit allocation
Not bit addressable; Reset value 00H
Bit
Symbol
Table 9:
7
6
-
-
5
-
4
-
3
2
GF2
0
1
-
0
DPS
AUXR1 - Auxiliary register 1 (address A2H) bit description
Bit
Symbol
Description
7 to 4
-
Reserved for future use. Should be set to ‘0’ by user programs.
3
GF2
General purpose user-defined flag.
2
0
This bit contains a hard-wired ‘0’. Allows toggling of the DPS bit by
incrementing AUXR1, without interfering with other bits in the
register.
1
-
Reserved for future use. Should be set to ‘0’ by user programs.
0
DPS
Data pointer select. Chooses one of two Data Pointers for use by
the program. See text for details.
7.2 Flash memory In-Application Programming
7.2.1
Flash organization
The P89V51RD2 program memory consists of a 64 kB block. An In-System
Programming (ISP) capability, in a second 8 kB block, is provided to allow the user
code to be programmed in-circuit through the serial port. There are three methods of
erasing or programming of the Flash memory that may be used. First, the Flash may
be programmed or erased in the end-user application by calling low-level routines
through a common entry point (IAP). Second, the on-chip ISP boot loader may be
invoked. This ISP boot loader will, in turn, call low-level routines through the same
common entry point that can be used by the end-user application. Third, the Flash
may be programmed or erased using the parallel method by using a commercially
available EPROM programmer which supports this device.
7.2.2
Boot block
When the microcontroller programs its own Flash memory, all of the low level details
are handled by code that is contained in a Boot block that is separate from the user
Flash memory. A user program calls the common entry point in the Boot block with
appropriate parameters to accomplish the desired operation. Boot block operations
include erase user code, program user code, program security bits, etc.
A Chip-Erase operation can be performed using a commercially available parallel
programer. This operation will erase the contents of this Boot Block and it will be
necessary for the user to reprogram this Boot Block (Block 1) with the
Philips-provided ISP/IAP code in order to use the ISP or IAP capabilities of this
device. Contact http://www.semiconductors.philips.com to obtain the hex file for
this device. Questions may be directed to [email protected].
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7.2.3
Power-On reset code execution
Following reset, the P89V51RD2 will either enter the SoftICE mode (if previously
enabled via ISP command) or attempt to autobaud to the ISP boot loader. If this
autobaud is not successful within about 400 ms, the device will begin execution of the
user code.
7.2.4
In-System Programming (ISP)
In-System Programming is performed without removing the microcontroller from the
system. The In-System Programming facility consists of a series of internal hardware
resources coupled with internal firmware to facilitate remote programming of the
P89V51RD2 through the serial port. This firmware is provided by Philips and
embedded within each P89V51RD2 device. The Philips In-System Programming
facility has made in-circuit programming in an embedded application possible with a
minimum of additional expense in components and circuit board area. The ISP
function uses five pins (VDD, VSS, TxD, RxD, and RST). Only a small connector needs
to be available to interface your application to an external circuit in order to use this
feature.
7.2.5
Using the In-System Programming
The ISP feature allows for a wide range of baud rates to be used in your application,
independent of the oscillator frequency. It is also adaptable to a wide range of
oscillator frequencies. This is accomplished by measuring the bit-time of a single bit
in a received character. This information is then used to program the baud rate in
terms of timer counts based on the oscillator frequency. The ISP feature requires that
an initial character (an uppercase U) be sent to the P89V51RD2 to establish the baud
rate. The ISP firmware provides auto-echo of received characters. Once baud rate
initialization has been performed, the ISP firmware will only accept Intel Hex-type
records. Intel Hex records consist of ASCII characters used to represent hexadecimal
values and are summarized below:
:NNAAAARRDD..DDCC<crlf>
In the Intel Hex record, the ‘NN’ represents the number of data bytes in the record.
The P89V51RD2 will accept up to 32 data bytes. The ‘AAAA’ string represents the
address of the first byte in the record. If there are zero bytes in the record, this field is
often set to 0000. The ‘RR’ string indicates the record type. A record type of ‘00’ is a
data record. A record type of ‘01’ indicates the end-of-file mark. In this application,
additional record types will be added to indicate either commands or data for the ISP
facility.
The maximum number of data bytes in a record is limited to 32 (decimal). ISP
commands are summarized in Table 10. As a record is received by the P89V51RD2,
the information in the record is stored internally and a checksum calculation is
performed. The operation indicated by the record type is not performed until the
entire record has been received. Should an error occur in the checksum, the
P89V51RD2 will send an ‘X’ out the serial port indicating a checksum error. If the
checksum calculation is found to match the checksum in the record, then the
command will be executed. In most cases, successful reception of the record will be
indicated by transmitting a ‘.’ character out the serial port.
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8-bit microcontrollers with 80C51 core
Table 10:
In-System Programming (ISP) hex record formats
Record type
Command/data function
00
Program User Code Memory
:nnaaaa00dd..ddcc
Where:
nn = number of bytes to program
aaaa = address
dd..dd = data bytes
cc = checksum
Example:
:100000000102030405006070809cc
01
End of File (EOF), no operation
:xxxxxx01cc
Where:
xxxxxx = required field but value is a ‘don’t care’
cc = checksum
Example:
:00000001FF
02
Set SoftICE mode
Following the next reset the device will enter the SoftICE mode. Will erase
user code memory, erase device serial number.
:00000002cc
Where:
xxxxxx = required field but value is a ‘don’t care’
cc = checksum
Example:
:00000002FE
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Table 10:
In-System Programming (ISP) hex record formats…continued
Record type
Command/data function
03
Miscellaneous Write Functions
:nnxxxx03ffssddcc
Where:
nn = number of bytes in the record
xxxx = required field but value is a ‘don’t care’
ff = subfunction code
ss = selection code
dd = data (if needed)
cc = checksum
Subfunction code = 01 (Erase Block 0)
ff = 01
Subfunction code = 05 (Program security bit, Double Clock)
ff = 05
ss = 01 program security bit
ss = 05 program double clock bit
Subfunction code = 08 (Erase sector, 128 bytes)
ff = 08
ss = high byte of sector address (A15:8)
dd = low byte of sector address (A7, A6:0 = 0)
Example:
:0300000308E000F2 (erase sector at E000h)
04
Display Device Data or Blank Check
:05xxxx04sssseeeeffcc
Where
05 = number of bytes in the record
xxxx = required field but value is a ‘don’t care’
04 = function code for display or blank check
ssss = starting address, MSB first
eeee = ending address, MSB first
ff = subfunction
00 = display data
01 = blank check
cc = checksum
Subfunction codes:
Example:
:0500000400001FFF00D9 (display from 0000h to 1FFFh)
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Table 10:
In-System Programming (ISP) hex record formats…continued
Record type
Command/data function
05
Miscellaneous Read Functions
:02xxxx05ffsscc
Where:
02 = number of bytes in the record
xxxx = required field but value is a ‘don’t care’
05 = function code for misc read
ffss = subfunction and selection code
0000 = read manufacturer id
0001 = read device id 1
0002 = read ISP/IAP version
0700 = read security bit (00000 SB 0 Double Clock)
cc = checksum
Example:
:020000050000F9 (display manufacturer id)
06
Direct Load of Baud Rate
:02xxxx06HHLLcc
Where:
02 = number of bytes in the record
xxxx = required field but value is a ‘don’t care’
HH = high byte of timer
LL = low byte of timer
cc = checksum
Example:
:02000007FFFFcc (load T2 = 7FFF)
07
Reset serial number
:xxxxxx07cc
Where:
xxxxxx = required field but value is a ‘don’t care’
07 = reset serial number function
cc = checksum
Example:
:00000001FF
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Table 10:
In-System Programming (ISP) hex record formats…continued
Record type
Command/data function
08
Verify serial number
:nnxxxx08ss..sscc
Where:
xxxxxx = required field but value is a ‘don’t care’
08 = verify serial number function
ss..ss = serial number contents
cc = checksum
Example:
:03000008010203EF (verify s/n = 010203)
09
Write serial number
:nnxxxx09ss..sscc
Where:
xxxxxx = required field but value is a ‘don’t care’
09 = write serial number function
ss..ss = serial number contents
cc = checksum
Example:
:03000009010203EE (write s/n = 010203)
0A
Display serial number
:xxxxxx0Acc
Where:
xxxxxx = required field but value is a ‘don’t care’
0A = display serial number function
cc = checksum
Example:
:0000000AF6
7.2.6
Using the serial number
This device has the option of storing a 31-byte serial number along with the length of
the serial number (for a total of 32 bytes) in a non-volatile memory space. When ISP
mode is entered, the serial number length is evaluated to determine if the serial
number is in use. If the length of the serial number is programmed to either 00H or
FFH, the serial number is considered not in use. If the serial number is in use,
reading, programming, or erasing of the user code memory or the serial number is
blocked until the user transmits a ‘verify serial number’ record containing a serial
number and length that matches the serial number and length previously stored in the
device. The user can reset the serial number to all zeros and set the length to zero by
sending the ‘reset serial number' record. In addition, the ‘reset serial number’ record
will also erase all user code.
7.2.7
In-Application Programming method
Several In-Application Programming (IAP) calls are available for use by an application
program to permit selective erasing, reading and programming of Flash sectors,
pages, security bit, configuration bytes, and device id. All calls are made through a
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common interface, PGM_MTP. The programming functions are selected by setting up
the microcontroller’s registers before making a call to PGM_MTP at 1FF0H. The IAP
calls are shown in Table 11
Table 11:
IAP function calls
IAP function
IAP call parameters
Read Id
Input parameters:
R1 = 00h
DPH = 00H
DPL = 00H = mfgr id
DPL = 01H = device id 1
DPL = 02H = ISP version number
DPL = 03H = IAP version number
Return parameter(s):
ACC = requested parameter
Erase Block 0
Input parameters:
R1 = 01h
Return parameter(s):
ACC = 00 = pass
ACC = !00 = fail
Program User Code
Input parameters:
R1 = 02h
DPH = memory address MSB
DPL = memory address LSB
ACC = byte to program
Return parameter(s):
ACC = 00 = pass
ACC = !00 = fail
Read User Code
Input parameters:
R1 = 03h
DPH = memory address MSB
DPL = memory address LSB
Return parameter(s):
ACC = device data
Program Security Bit, Double
Clock
Input parameters:
R1 = 05h
DPL = 01H = security bit
DPL = 05H = Double Clock
Return parameter(s):
ACC = 00 = pass
ACC = !00 = fail
Read Security Bit, Double Clock
Input parameters:
ACC = 07h
Return parameter(s):
ACC = 000 S/N-match 0 SB 0 DBL_CLK
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7.3 Timers/counters 0 and 1
The two 16-bit Timer/Counter registers: Timer 0 and Timer 1 can be configured to
operate either as timers or event counters (see Table 12 and Table 13).
In the ‘Timer’ function, the register is incremented every machine cycle. Thus, one
can think of it as counting machine cycles. Since a machine cycle consists of six
oscillator periods, the count rate is 1⁄6 of the oscillator frequency.
In the ‘Counter’ function, the register is incremented in response to a 1-to-0 transition
at its corresponding external input pin, T0 or T1. In this function, the external input is
sampled once every machine cycle.
When the samples show a high in one cycle and a low in the next cycle, the count is
incremented. The new count value appears in the register in the machine cycle
following the one in which the transition was detected. Since it takes two machine
cycles (12 oscillator periods) for 1-to-0 transition to be recognized, the maximum
count rate is 1⁄12 of the oscillator frequency. There are no restrictions on the duty cycle
of the external input signal, but to ensure that a given level is sampled at least once
before it changes, it should be held for at least one full machine cycle. In addition to
the ‘Timer’ or ‘Counter’ selection, Timer 0 and Timer 1 have four operating modes
from which to select.
The ‘Timer’ or ‘Counter’ function is selected by control bits C/T in the Special
Function Register TMOD. These two Timer/Counters have four operating modes,
which are selected by bit-pairs (M1, M0) in TMOD. Modes 0, 1, and 2 are the same
for both Timers/Counters. Mode 3 is different. The four operating modes are
described in the following text.
Table 12: TMOD - Timer/Counter mode control register (address 89H) bit allocation
Not bit addressable; Reset value: 00000000B; Reset source(s): any source
Bit
Symbol
Table 13:
Bit
7
6
5
4
3
2
1
0
T1GATE
T1C/T
T1M1
T1M0
T0GATE
T0C/T
T0M1
T0M0
TMOD - Timer/Counter mode control register (address 89H) bit description
Symbol
Description
T1/T0
Bits controlling Timer1/Timer0
GATE
Gating control when set. Timer/Counter ‘x’ is enabled only while
‘INTx’ pin is HIGH and ‘TRx’ control pin is set. When cleared,
Timer ‘x’ is enabled whenever ‘TRx’ control bit is set.
C/T
Gating Timer or Counter Selector cleared for Timer operation
(input from internal system clock.) Set for Counter operation (input
from ‘Tx’ input pin).
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Table 14:
TMOD - Timer/Counter mode control register (address 89H) M1/M0 operating
mode
M1
M0
Operating mode
0
0
0
8048 timer ‘TLx’ serves as 5-bit prescaler
0
1
1
16-bit Timer/Counter ‘THx’ and ‘TLx' are
cascaded; there is no prescaler.
1
0
2
8-bit auto-reload Timer/Counter ‘THx’ holds a
value which is to be reloaded into ‘TLx’ each
time it overflows.
1
1
3
(Timer 0) TL0 is an 8-bit Timer/Counter
controlled by the standard Timer 0 control bits.
TH0 is an 8-bit timer only controlled by Timer 1
control bits.
1
1
3
(Timer 1) Timer/Counter 1 stopped.
Table 15: TCON - Timer/Counter control register (address 88H) bit allocation
Bit addressable; Reset value: 00000000B; Reset source(s): any reset
Bit
Symbol
Table 16:
7.3.1
7
6
5
4
3
2
1
0
TF1
TR1
TF0
TR0
IE1
IT1
IE0
IT0
TCON - Timer/Counter control register (address 88H) bit description
Bit
Symbol
Description
7
TF1
Timer 1 overflow flag. Set by hardware on Timer/Counter overflow.
Cleared by hardware when the processor vectors to Timer 1
Interrupt routine, or by software.
6
TR1
Timer 1 Run control bit. Set/cleared by software to turn
Timer/Counter 1 on/off.
5
TF0
Timer 0 overflow flag. Set by hardware on Timer/Counter overflow.
Cleared by hardware when the processor vectors to Timer 0
Interrupt routine, or by software.
4
TR0
Timer 0 Run control bit. Set/cleared by software to turn
Timer/Counter 0 on/off.
3
IE1
Interrupt 1 Edge flag. Set by hardware when external interrupt 1
edge/low level is detected. Cleared by hardware when the interrupt
is processed, or by software.
2
IT1
Interrupt 1 Type control bit. Set/cleared by software to specify
falling edge/low level that triggers external interrupt 1.
1
IE0
Interrupt 0 Edge flag. Set by hardware when external interrupt 0
edge/low level is detected. Cleared by hardware when the interrupt
is processed, or by software.
0
IT0
Interrupt 0 Type control bit. Set/cleared by software to specify
falling edge/low level that triggers external interrupt 0.
Mode 0
Putting either Timer into Mode 0 makes it look like an 8048 Timer, which is an 8-bit
Counter with a fixed divide-by-32 prescaler. Figure 7 shows Mode 0 operation.
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Osc/6
Tn pin
overflow
C/T = 0
C/T = 1
control
TLn
(5-bits)
THn
(8-bits)
TFn
interrupt
TRn
TnGate
INTn Pin
002aaa519
Fig 7. Timer/Counter 0 or 1 in Mode 0 (13-bit counter).
In this mode, the Timer register is configured as a 13-bit register. As the count rolls
over from all 1s to all 0s, it sets the Timer interrupt flag TFn. The count input is
enabled to the Timer when TRn = 1 and either GATE = 0 or INTn = 1. (Setting
GATE = 1 allows the Timer to be controlled by external input INTn, to facilitate pulse
width measurements). TRn is a control bit in the Special Function Register TCON
(Figure 6). The GATE bit is in the TMOD register.
The 13-bit register consists of all 8 bits of THn and the lower 5 bits of TLn. The upper
3 bits of TLn are indeterminate and should be ignored. Setting the run flag (TRn)
does not clear the registers.
Mode 0 operation is the same for Timer 0 and Timer 1 (see Figure 7). There are two
different GATE bits, one for Timer 1 (TMOD.7) and one for Timer 0 (TMOD.3).
7.3.2
Mode 1
Mode 1 is the same as Mode 0, except that all 16 bits of the timer register (THn and
TLn) are used. See Figure 8.
Osc/6
Tn pin
overflow
C/T = 0
C/T = 1
control
TLn
(8-bits)
THn
(8-bits)
TFn
interrupt
TRn
TnGate
INTn Pin
002aaa520
Fig 8. Timer/Counter 0 or 1 in Mode 1 (16-bit counter).
7.3.3
Mode 2
Mode 2 configures the Timer register as an 8-bit Counter (TLn) with automatic reload,
as shown in Figure 9. Overflow from TLn not only sets TFn, but also reloads TLn with
the contents of THn, which must be preset by software. The reload leaves THn
unchanged. Mode 2 operation is the same for Timer 0 and Timer 1.
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Osc/6
Tn pin
C/T = 0
C/T = 1
control
TLn
(8-bits)
overflow
TFn
interrupt
reload
TRn
TnGate
THn
(8-bits)
INTn Pin
002aaa521
Fig 9. Timer/Counter 0 or 1 in Mode 2 (8-bit auto-reload).
7.3.4
Mode 3
When timer 1 is in Mode 3 it is stopped (holds its count). The effect is the same as
setting TR1 = 0.
Timer 0 in Mode 3 establishes TL0 and TH0 as two separate 8-bit counters. The logic
for Mode 3 and Timer 0 is shown in Figure 10. TL0 uses the Timer 0 control bits:
T0C/T, T0GATE, TR0, INT0, and TF0. TH0 is locked into a timer function (counting
machine cycles) and takes over the use of TR1 and TF1 from Timer 1. Thus, TH0
now controls the ‘Timer 1’ interrupt.
Mode 3 is provided for applications that require an extra 8-bit timer. With Timer 0 in
Mode 3, the P89V51RD2 can look like it has an additional Timer.
Note: When Timer 0 is in Mode 3, Timer 1 can be turned on and off by switching it
into and out of its own Mode 3. It can still be used by the serial port as a baud rate
generator, or in any application not requiring an interrupt.
Osc/6
T0 pin
C/T = 0
C/T = 1
control
TL0
(8-bits)
overflow
TH0
(8-bits)
overflow
TF0
interrupt
TF1
interrupt
TR0
TnGate
INT0 Pin
Osc/2
control
TR1
002aaa522
Fig 10. Timer/Counter 0 Mode 3 (two 8-bit counters).
7.4 Timer 2
Timer 2 is a 16-bit Timer/Counter which can operate as either an event timer or an
event counter, as selected by C/T2 in the special function register T2CON. Timer 2
has four operating modes: Capture, Auto-reload (up or down counting), Clock-out,
and Baud Rate Generator which are selected according to Table 17 using T2CON
(Table 18 and Table 19) and T2MOD (Table 20 and Table 21).
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Table 17:
Timer 2 operating mode
RCLK+TCLK CP/RL2
TR2
T2OE
Mode
0
0
1
0
16-BIT auto reload
0
1
1
0
16-bit capture
0
0
1
1
Programmable Clock-Out
1
X
1
0
Baud rate generator
X
X
0
X
off
Table 18: T2CON - Timer/Counter 2 control register (address C8H) bit allocation
Bit addressable; Reset value: 00H
Bit
Symbol
Table 19:
7
6
5
4
3
2
1
0
TF2
EXF2
RCLK
TCLK
EXEN2
TR2
C/T2
CP/RL2
T2CON - Timer/Counter 2 control register (address C8H) bit description
Bit
Symbol
Description
7
TF2
Timer 2 overflow flag set by a Timer 2 overflow and must be
cleared by software. TF2 will not be set when either RCLK or
TCLK = 1 or when Timer 2 is in Clock-out Mode.
6
EXF2
Timer 2 external flag is set when Timer 2 is in capture, reload or
baud-rate mode, EXEN2 = 1 and a negative transition on T2EX
occurs. If Timer 2 interrupt is enabled EXF2 = 1 causes the CPU to
vector to the Timer 2 interrupt routine. EXF2 must be cleared by
software.
5
RCLK
Receive clock flag. When set, causes the UART to use Timer 2
overflow pulses for its receive clock in modes 1 and 3. RCLK = 0
causes Timer 1 overflow to be used for the receive clock.
4
TCLK
Transmit clock flag. When set, causes the UART to use Timer 2
overflow pulses for its transmit clock in modes 1 and 3. TCLK = 0
causes Timer 1 overflows to be used for the transmit clock.
3
EXEN2
Timer 2 external enable flag. When set, allows a capture or reload
to occur as a result of a negative transition on T2EX if Timer 2 is
not being used to clock the serial port. EXEN2 = 0 causes Timer 2
to ignore events at T2EX.
2
TR2
Start/stop control for Timer 2. A logic ‘1’ enables the timer to run.
1
C/T2
Timer or counter select. (Timer 2)
0 = internal timer (fosc/6)
1 = External event counter (falling edge triggered; external
clock’s maximum rate = fOSC/12
0
CP/RL2
Capture/Reload flag. When set, captures will occur on negative
transitions at T2EX if EXEN2 = 1. When cleared, auto-reloads will
occur either with Timer 2 overflows or negative transitions at T2EX
when EXEN2 = 1. When either RCLK = 1 or TCLK = 1, this bit is
ignored and the timer is forced to auto-reload on Timer 2 overflow.
Table 20: T2MOD - Timer 2 mode control register (address C9H) bit allocation
Not bit addressable; Reset value: XX000000B
Bit
7
6
5
4
3
2
1
0
Symbol
-
-
-
-
-
-
T2OE
DCEN
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Table 21:
7.4.1
T2MOD - Timer 2 mode control register (address C9H) bit description
Bit
Symbol
Description
7 to 2
-
Reserved for future use. Should be set to ‘0’ by user programs.
1
T2OE
Timer 2 Output Enable bit. Used in programmable clock-out mode
only.
0
DCEN
Down Count Enable bit. When set, this allows Timer 2 to be
configured as an up/down counter.
Capture mode
In the Capture Mode there are two options which are selected by bit EXEN2 in
T2CON. If EXEN2 = 0 Timer 2 is a 16-bit timer or counter (as selected by C/T2 in
T2CON) which upon overflowing sets bit TF2, the Timer 2 overflow bit.
The capture mode is illustrated in Figure 11.
OSC
¸6
C/T2 = 0
TL2
(8-bits)
TF2
control
C/T2 = 1
T2 pin
TH2
(8-bits)
TR2
capture
transition
detector
Timer 2
interrupt
RCAP2L RCAP2H
T2EX pin
EXF2
control
EXEN2
002aaa523
Fig 11. Timer 2 in Capture Mode.
This bit can be used to generate an interrupt (by enabling the Timer 2 interrupt bit in
the IEN0 register). If EXEN2 = 1, Timer 2 operates as described above, but with the
added feature that a 1- to -0 transition at external input T2EX causes the current
value in the Timer 2 registers, TL2 and TH2, to be captured into registers RCAP2L
and RCAP2H, respectively.
In addition, the transition at T2EX causes bit EXF2 in T2CON to be set, and EXF2 like
TF2 can generate an interrupt (which vectors to the same location as Timer 2
overflow interrupt). The Timer 2 interrupt service routine can interrogate TF2 and
EXF2 to determine which event caused the interrupt.
There is no reload value for TL2 and TH2 in this mode. Even when a capture event
occurs from T2EX, the counter keeps on counting T2 pin transitions or fosc/6 pulses.
Since once loaded contents of RCAP2L and RCAP2H registers are not protected,
once Timer2 interrupt is signalled it has to be serviced before new capture event on
T2EX pin occurs. Otherwise, the next falling edge on T2EX pin will initiate reload of
the current value from TL2 and TH2 to RCAP2L and RCAP2H and consequently
corrupt their content related to previously reported interrupt.
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7.4.2
Auto-reload mode (up or down counter)
In the 16-bit auto-reload mode, Timer 2 can be configured as either a timer or counter
(via C/T2 in T2CON), then programmed to count up or down. The counting direction
is determined by bit DCEN (Down Counter Enable) which is located in the T2MOD
register (see Table 20 and Table 21). When reset is applied, DCEN = 0 and Timer 2
will default to counting up. If the DCEN bit is set, Timer 2 can count up or down
depending on the value of the T2EX pin.
Figure 12 shows Timer 2 counting up automatically (DCEN = 0).
OSC
¸6
C/T2 = 0
TL2
(8-bits)
TF2
control
C/T2 = 1
T2 pin
TH2
(8-bits)
TR2
reload
transition
detector
Timer 2
interrupt
RCAP2L RCAP2H
T2EX pin
EXF2
control
EXEN2
002aaa524
Fig 12. Timer 2 in auto-reload mode (DCEN = 0)
In this mode, there are two options selected by bit EXEN2 in T2CON register. If
EXEN2 = 0, then Timer 2 counts up to 0FFFFH and sets the TF2 (Overflow Flag) bit
upon overflow. This causes the Timer 2 registers to be reloaded with the 16-bit value
in RCAP2L and RCAP2H. The values in RCAP2L and RCAP2H are preset by
software means.
Auto reload frequency when Timer 2 is counting up can be determined from this
formula:
SupplyFrequency
-------------------------------------------------------------------------------( 65536 ∠( RCAP2H , RCAP2L ) )
(1)
Where SupplyFrequency is either fosc (C/T2 = 0) or frequency of signal on T2 pin
(C/T2 = 1).
If EXEN2 = 1, a 16-bit reload can be triggered either by an overflow or by a 1-to-0
transition at input T2EX. This transition also sets the EXF2 bit. The Timer 2 interrupt,
if enabled, can be generated when either TF2 or EXF2 is ‘1’.
Microcontroller’s hardware will need three consecutive machine cycles in order to
recognize falling edge on T2EX and set EXF2 = 1: in the first machine cycle pin T2EX
has to be sampled as ‘1’; in the second machine cycle it has to be sampled as ‘0’, and
in the third machine cycle EXF2 will be set to ‘1’.
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In Figure 13, DCEN = 1 and Timer 2 is enabled to count up or down. This mode
allows pin T2EX to control the direction of count. When a logic ‘1’ is applied at pin
T2EX Timer 2 will count up. Timer 2 will overflow at 0FFFFH and set the TF2 flag,
which can then generate an interrupt, if the interrupt is enabled. This timer overflow
also causes the 16-bit value in RCAP2L and RCAP2H to be reloaded into the timer
registers TL2 and TH2.
toggle
(down counting reload value)
OSC
¸6
FFH
TL2
(8-bits)
TH2
(8-bits)
EXF2
C/T2 = 0
control
C/T2 = 1
T2 pin
FFH
underflow
TF2
overflow
Timer 2
interrupt
TR2
count direction
1 = up
0 = down
RCAP2L RCAP2H
(up counting reload value)
T2EX pin
002aaa525
Fig 13. Timer 2 in Auto Reload mode (DCEN = 1).
When a logic 0 is applied at pin T2EX this causes Timer 2 to count down. The timer
will underflow when TL2 and TH2 become equal to the value stored in RCAP2L and
RCAP2H. Timer 2 underflow sets the TF2 flag and causes 0FFFFH to be reloaded
into the timer registers TL2 and TH2. The external flag EXF2 toggles when Timer 2
underflows or overflows. This EXF2 bit can be used as a 17th bit of resolution if
needed.
7.4.3
Programmable clock-out
A 50% duty cycle clock can be programmed to come out on pin T2 (P1.0). This pin,
besides being a regular I/O pin, has two additional functions. It can be programmed:
1. To input the external clock for Timer/Counter 2, or
2. To output a 50% duty cycle clock ranging from 122 Hz to 8 MHz at a 16 MHz
operating frequency.
To configure the Timer/Counter 2 as a clock generator, bit C/T2 (in T2CON) must be
cleared and bit T20E in T2MOD must be set. Bit TR2 (T2CON.2) also must be set to
start the timer.
The Clock-Out frequency depends on the oscillator frequency and the reload value of
Timer 2 capture registers (RCAP2H, RCAP2L) as shown in Equation 2:
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OscillatorFrequency
----------------------------------------------------------------------------------------2 × ( 65536 ∠( RCAP2H , RCAP2L ) )
(2)
Where (RCAP2H,RCAP2L) = the content of RCAP2H and RCAP2L taken as a 16-bit
unsigned integer.
In the Clock-Out mode Timer 2 roll-overs will not generate an interrupt. This is similar
to when it is used as a baud-rate generator.
7.4.4
Baud rate generator mode
Bits TCLK and/or RCLK in T2CON allow the UART) transmit and receive baud rates
to be derived from either Timer 1 or Timer 2 (See Section 7.5 “UARTs” on page 35 for
details). When TCLK = 0, Timer 1 is used as the UART transmit baud rate generator.
When TCLK = 1, Timer 2 is used as the UART transmit baud rate generator. RCLK
has the same effect for the UART receive baud rate. With these two bits, the serial
port can have different receive and transmit baud rates – Timer 1 or Timer 2.
Figure 14 shows Timer 2 in baud rate generator mode:
OSC
¸2
C/T2 = 0
TL2
(8-bits)
TX/RX baud rate
control
C/T2 = 1
T2 pin
TH2
(8-bits)
reload
TR2
transition
detector
RCAP2L RCAP2H
T2EX pin
EXF2
Timer 2
interrupt
control
EXEN2
002aaa526
Fig 14. Timer 2 in Baud Rate Generator mode.
The baud rate generation mode is like the auto-reload mode, when a rollover in TH2
causes the Timer 2 registers to be reloaded with the 16-bit value in registers
RCAP2H and RCAP2L, which are preset by software.
The baud rates in modes 1 and 3 are determined by Timer 2’s overflow rate given
below:
Modes 1 and 3 Baud Rates = Timer 2 Overflow Rate/16
The timer can be configured for either ‘timer’ or ‘counter’ operation. In many
applications, it is configured for ‘timer' operation (C/T2 = 0). Timer operation is
different for Timer 2 when it is being used as a baud rate generator.
Usually, as a timer it would increment every machine cycle (i.e., 1⁄6 the oscillator
frequency). As a baud rate generator, it increments at the oscillator frequency. Thus
the baud rate formula is as follows:
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Modes 1 and 3 Baud Rates =
OscillatorFrequency
-----------------------------------------------------------------------------------------------( 16 × ( 65536 – ( RCAP2H , RCAP2L ) ) )
(3)
Where: (RCAP2H, RCAP2L) = The content of RCAP2H and RCAP2L taken as a
16-bit unsigned integer.
The Timer 2 as a baud rate generator mode is valid only if RCLK and/or TCLK = 1 in
T2CON register. Note that a rollover in TH2 does not set TF2, and will not generate
an interrupt. Thus, the Timer 2 interrupt does not have to be disabled when Timer 2 is
in the baud rate generator mode. Also if the EXEN2 (T2 external enable flag) is set, a
1-to-0 transition in T2EX (Timer/counter 2 trigger input) will set EXF2 (T2 external
flag) but will not cause a reload from (RCAP2H, RCAP2L) to (TH2,TL2). Therefore
when Timer 2 is in use as a baud rate generator, T2EX can be used as an additional
external interrupt, if needed.
When Timer 2 is in the baud rate generator mode, one should not try to read or write
TH2 and TL2. Under these conditions, a read or write of TH2 or TL2 may not be
accurate. The RCAP2 registers may be read, but should not be written to, because a
write might overlap a reload and cause write and/or reload errors. The timer should
be turned off (clear TR2) before accessing the Timer 2 or RCAP2 registers. Table 22
shows commonly used baud rates and how they can be obtained from Timer 2.
7.4.5
Summary of baud rate equations
Timer 2 is in baud rate generating mode. If Timer 2 is being clocked through pin
T2(P1.0) the baud rate is:
Baud rate = Timer 2 overflow rate / 16
If Timer 2 is being clocked internally, the baud rate is:
Baud rate = fosc / (16 × (65536 − (RCAP2H, RCAP2L)))
Where fosc = oscillator frequency
To obtain the reload value for RCAP2H and RCAP2L, the above equation can be
rewritten as:
RCAP2H, RCAP2L = 65536 − fosc / (16 × baud rate)
Table 22:
Baud rate
Timer 2 generated commonly used baud rates
Osc freq
RCAP2H
RCAP2L
750K
12 MHz
FF
FF
19.2K
12 MHz
FF
D9
9.6K
12 MHz
FF
B2
4.8K
12 MHz
FF
64
2.4K
12 MHz
FE
C8
600
12 MHz
FB
1E
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Table 22:
Timer 2 generated commonly used baud rates…continued
Baud rate
Osc freq
Timer 2
RCAP2H
RCAP2L
220
12 MHz
F2
AF
600
6 MHz
FD
8F
220
6 MHz
F9
57
7.5 UARTs
The UART operates in all standard modes. Enhancements over the standard 80C51
UART include Framing Error detection, and automatic address recognition.
7.5.1
Mode 0
Serial data enters and exits through RxD and TxD outputs the shift clock. Only 8 bits
are transmitted or received, LSB first. The baud rate is fixed at 1⁄6 of the CPU clock
frequency. UART configured to operate in this mode outputs serial clock on TxD line
no matter whether it sends or receives data on RxD line.
7.5.2
Mode 1
10 bits are transmitted (through TxD) or received (through RxD): a start bit (logical 0),
8 data bits (LSB first), and a stop bit (logical 1). When data is received, the stop bit is
stored in RB8 in Special Function Register SCON. The baud rate is variable and is
determined by the Timer 1⁄2 overflow rate.
7.5.3
Mode 2
11 bits are transmitted (through TxD) or received (through RxD): start bit (logical 0), 8
data bits (LSB first), a programmable 9th data bit, and a stop bit (logical 1). When
data is transmitted, the 9th data bit (TB8 in SCON) can be assigned the value of 0 or
(e.g. the parity bit (P, in the PSW) could be moved into TB8). When data is received,
the 9th data bit goes into RB8 in Special Function Register SCON, while the stop bit
is ignored. The baud rate is programmable to either 1⁄16 or 1⁄32 of the CPU clock
frequency, as determined by the SMOD1 bit in PCON.
7.5.4
Mode 3
11 bits are transmitted (through TxD) or received (through RxD): a start bit (logical 0),
8 data bits (LSB first), a programmable 9th data bit, and a stop bit (logical 1). In fact,
Mode 3 is the same as Mode 2 in all respects except baud rate. The baud rate in
Mode 3 is variable and is determined by the Timer 1⁄2 overflow rate.
Table 23: SCON - Serial port control register (address 98H) bit allocation
Bit addressable; Reset value: 00H
Bit
7
Symbol SM0/FE
6
5
4
SM1
SM2
REN
TB8
2
RB8
1
TI
0
RI
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Table 24:
Bit
Symbol
Description
7
SM0/FE
The usage of this bit is determined by SMOD0 in the PCON
register. If SMOD0 = 0, this bit is SM0, which with SM1, defines
the serial port mode. If SMOD0 = 1, this bit is FE (Framing Error).
FE is set by the receiver when an invalid stop bit is detected. Once
set, this bit cannot be cleared by valid frames but can only be
cleared by software. (Note: It is recommended to set up UART
mode bits SM0 and SM1 before setting SMOD0 to ‘1’.)
6
SM1
With SM0, defines the serial port mode (see Table 25 below).
5
SM2
Enables the multiprocessor communication feature in Modes 2 and
3. In Mode 2 or 3, if SM2 is set to ‘1’, then Rl will not be activated if
the received 9th data bit (RB8) is ‘0’. In Mode 1, if SM2 = 1 then RI
will not be activated if a valid stop bit was not received. In Mode 0,
SM2 should be ‘0’.
4
REN
Enables serial reception. Set by software to enable reception.
Clear by software to disable reception.
3
TB8
The 9th data bit that will be transmitted in Modes 2 and 3. Set or
clear by software as desired.
2
RB8
In Modes 2 and 3, is the 9th data bit that was received. In Mode 1,
it SM2 = 0, RB8 is the stop bit that was received. In Mode 0, RB8
is undefined.
1
TI
Transmit interrupt flag. Set by hardware at the end of the 8th bit
time in Mode 0, or at the stop bit in the other modes, in any serial
transmission. Must be cleared by software.
0
RI
Receive interrupt flag. Set by hardware at the end of the 8th bit
time in Mode 0, or approximately halfway through the stop bit time
in all other modes. (See SM2 for exceptions). Must be cleared by
software.
Table 25:
7.5.5
SCON - Serial port control register (address 98H) bit description
SCON - Serial port control register (address 98H) SM0/SM1 mode definition
SM0, SM1
UART mode
Baud rate
00
0: shift register
CPU clock/6
01
1: 8-bit UART
variable
10
2: 9-bit UART
CPU clock/32 or CPU clock/16
11
3: 9-bit UART
variable
Framing error
Framing error (FE) is reported in the SCON.7 bit if SMOD0 (PCON.6) = 1. If
SMOD0 = 0, SCON.7 is the SM0 bit for the UART, it is recommended that SM0 is set
up before SMOD0 is set to ‘1’.
7.5.6
More about UART mode 1
Reception is initiated by a detected 1-to-0 transition at RxD. For this purpose RxD is
sampled at a rate of 16 times whatever baud rate has been established. When a
transition is detected, the divide-by-16 counter is immediately reset to align its
rollovers with the boundaries of the incoming bit times.
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The 16 states of the counter divide each bit time into 16ths. At the 7th, 8th, and 9th
counter states of each bit time, the bit detector samples the value of RxD. The value
accepted is the value that was seen in at least 2 of the 3 samples. This is done for
noise rejection. If the value accepted during the first bit time is not 0, the receive
circuits are reset and the unit goes back to looking for another 1-to-0 transition. This
is to provide rejection of false start bits. If the start bit proves valid, it is shifted into the
input shift register, and reception of the rest of the frame will proceed.
The signal to load SBUF and RB8, and to set RI, will be generated if, and only if, the
following conditions are met at the time the final shift pulse is generated: (a) RI = 0,
and (b) Either SM2 = 0, or the received stop bit = 1.
If either of these two conditions is not met, the received frame is irretrievably lost. If
both conditions are met, the stop bit goes into RB8, the 8 data bits go into SBUF, and
RI is activated.
7.5.7
More about UART modes 2 and 3
Reception is performed in the same manner as in mode 1.
The signal to load SBUF and RB8, and to set RI, will be generated if, and only if, the
following conditions are met at the time the final shift pulse is generated: (a) RI = 0,
and (b) Either SM2 = 0, or the received 9th data bit = 1.
If either of these conditions is not met, the received frame is irretrievably lost, and RI
is not set. If both conditions are met, the received 9th data bit goes into RB8, and the
first 8 data bits go into SBUF.
7.5.8
Multiprocessor communications
UART modes 2 and 3 have a special provision for multiprocessor communications. In
these modes, 9 data bits are received or transmitted. When data is received, the 9th
bit is stored in RB8. The UART can be programmed so that when the stop bit is
received, the serial port interrupt will be activated only if RB8 = 1. This feature is
enabled by setting bit SM2 in SCON. One way to use this feature in multiprocessor
systems is as follows:
When the master processor wants to transmit a block of data to one of several slaves,
it first sends out an address byte which identifies the target slave. An address byte
differs from a data byte in a way that the 9th bit is ‘1’ in an address byte and ‘0’ in the
data byte. With SM2 = 1, no slave will be interrupted by a data byte, i.e. the received
9th bit is ‘0’. However, an address byte having the 9th bit set to ‘1’ will interrupt all
slaves, so that each slave can examine the received byte and see if it is being
addressed or not. The addressed slave will clear its SM2 bit and prepare to receive
the data (still 9 bits long) that follow. The slaves that weren’t being addressed leave
their SM2 bits set and go on about their business, ignoring the subsequent data
bytes.
SM2 has no effect in Mode 0, and in Mode 1 can be used to check the validity of the
stop bit, although this is better done with the Framing Error flag. When UART receives
data in mode 1 and SM2 = 1, the receive interrupt will not be activated unless a valid
stop bit is received.
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7.5.9
Automatic address recognition
Automatic Address Recognition is a feature which allows the UART to recognize
certain addresses in the serial bit stream by using hardware to make the
comparisons. This feature saves a great deal of software overhead by eliminating the
need for the software to examine every serial address which passes by the serial
port. This feature is enabled for the UART by setting the SM2 bit in SCON. In the 9 bit
UART modes, mode 2 and mode 3, the Receive Interrupt flag (RI) will be
automatically set when the received byte contains either the ‘Given’ address or the
‘Broadcast' address. The 9 bit mode requires that the 9th information bit is a ‘1’ to
indicate that the received information is an address and not data.
Using the Automatic Address Recognition feature allows a master to selectively
communicate with one or more slaves by invoking the Given slave address or
addresses. All of the slaves may be contacted by using the Broadcast address. Two
Special Function Registers are used to define the slave’s address, SADDR, and the
address mask, SADEN. SADEN is used to define which bits in the SADDR are to be
used and which bits are ‘don’t care’. The SADEN mask can be logically ANDed with
the SADDR to create the ‘Given’ address which the master will use for addressing
each of the slaves. Use of the Given address allows multiple slaves to be recognized
while excluding others.
This device uses the methods presented in Figure 15 to determine if a ‘Given’ or
‘Broadcast’ address has been received or not.
rx_byte(7)
saddr(7)
saden(7)
.
.
.
given_address_match
rx_byte(0)
saddr(0)
saden(0)
logic used by P89LV51RD2 UART to detect 'given address' in received data
saddr(7)
saden(7)
rx_byte(7)
.
.
.
broadcast_address_match
saddr(0)
saden(0)
rx_byte(0)
logic used by P89LV51RD2 UART to detect 'given address' in received data
002aaa527
Fig 15. Schemes used by the UART to detect ‘given’ and ‘broadcast’ addresses when multiprocessor
communications is enabled
The following examples will help to show the versatility of this scheme.
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Table 26:
Slave 0
Slave 1
Slaves 0 and 1 scheme examples
SADDR = 1100 0000
SADEN =
1111 1101
Given =
1100 00X0
SADDR = 1100 0000
SADEN =
1111 1110
Given =
1100 000X
In the above example SADDR is the same and the SADEN data is used to
differentiate between the two slaves. Slave 0 requires a ‘0’ in bit 0 and it ignores bit 1.
Slave 1 requires a ‘0’ in bit 1 and bit 0 is ignored. A unique address for Slave 0 would
be 1100 0010 since slave 1 requires a ‘0’ in bit 1. A unique address for slave 1 would
be 1100 0001 since a ‘1’ in bit 0 will exclude slave 0. Both slaves can be selected at
the same time by an address which has bit 0 = 0 (for slave 0) and bit 1 = 0 (for
slave 1). Thus, both could be addressed with 1100 0000.
In a more complex system the following could be used to select slaves 1 and 2 while
excluding slave 0:
Table 27:
Slave 0
Slave 1
Slave 2
Slaves 0, 1 and 2 scheme examples
SADDR = 1110 0000
SADEN =
1111 1001
Given =
1110 0XX0
SADDR = 1110 0000
SADEN =
1111 1010
Given =
1110 0X0X
SADDR = 1110 0000
SADEN =
1111 1100
Given =
1110 00XX
In the above example the differentiation among the 3 slaves is in the lower 3 address
bits. Slave 0 requires that bit 0 = 0 and it can be uniquely addressed by 1110 0110.
Slave 1 requires that bit 1 = 0 and it can be uniquely addressed by 1110 0101. Slave
2 requires that bit 2 = 0 and its unique address is 1110 0011. To select Slaves 0 and
1 and exclude Slave 2 use address 1110 0100, since it is necessary to make bit 2 = 1
to exclude slave 2. The Broadcast Address for each slave is created by taking the
logical OR of SADDR and SADEN. Zeros in this result are treated as don’t-cares. In
most cases, interpreting the don’t-cares as ones, the broadcast address will be FF
hexadecimal. Upon reset SADDR and SADEN are loaded with 0s. This produces a
given address of all ‘don’t cares’ as well as a Broadcast address of all ‘don’t cares'.
This effectively disables the Automatic Addressing mode and allows the
microcontroller to use standard UART drivers which do not make use of this feature.
7.6 Serial peripheral interface
7.6.1
SPI features
• Master or slave operation
• 10 MHz bit frequency (max)
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•
•
•
•
•
7.6.2
LSB first or MSB first data transfer
Four programmable bit rates
End of transmission (SPIF)
Write collision flag protection (WCOL)
Wake-up from idle mode (slave mode only)
SPI description
The serial peripheral interface (SPI) allows high-speed synchronous data transfer
between the P89V51RD2 and peripheral devices or between several P89V51RD2
devices. Figure 16 shows the correspondence between master and slave SPI
devices. The SCK pin is the clock output and input for the master and slave modes,
respectively. The SPI clock generator will start following a write to the master devices
SPI data register. The written data is then shifted out of the MOSI pin on the master
device into the MOSI pin of the slave device. Following a complete transmission of
one byte of data, the SPI clock generator is stopped and the SPIF flag is set. An SPI
interrupt request will be generated if the SPI Interrupt Enable bit (SPIE) and the Serial
Port Interrupt Enable bit (ES) are both set.
An external master drives the Slave Select input pin, SS/P1[4], low to select the SPI
module as a slave. If SS/P1[4] has not been driven low, then the slave SPI unit is not
active and the MOSI/P1[5] port can also be used as an input port pin.
CPHA and CPOL control the phase and polarity of the SPI clock. Figure 17 and
Figure 18 show the four possible combinations of these two bits.
MSB Master LSB
MISO
MSB Slave LSB
MISO
8-bit Shift Register
8-bit Shift Register
MOSI
SPI
Clock Generator
MOSI
SCK
SCK
SS
SS
VDD
VSS
002aaa528
Fig 16. SPI master-slave interconnection.
Table 28: SPCR - SPI control register (address D5H) bit allocation
Bit addressable; Reset source(s): any reset; Reset value: 00000000B
Bit
Symbol
7
6
5
4
3
2
1
0
SPIE
SPE
DORD
MSTR
CPOL
CPHA
SPR1
SPR0
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Table 29:
SPCR - SPI control register (address D5H) bit description
Bit
Symbol
Description
7
SPIE
If both SPIE and ES are set to one, SPI interrupts are enabled.
6
SPE
SPI enable bit. When set enables SPI.
5
DORD
Data transmission order. 0 = MSB first; 1 = LSB first in data
transmission.
4
MSTR
Master/slave select. 1 = master mode, 0 = slave mode.
3
CPOL
Clock polarity. 1 = SCK is high when idle (active LOW), 0 = SCK is
low when idle (active HIGH).
2
CPHA
Clock Phase control bit. 1 = shift triggered on the trailing edge of
the clock; 0 = shift triggered on the leading edge of the clock.
1
SPR1
SPI Clock Rate Select bit 1. Along with SPR0 controls the SCK
rate of the device when a master. SPR1 and SPR0 have no effect
on the slave. See Table 30 below.
0
SPR0
SPI Clock Rate Select bit 0. Along with SPR1 controls the SCK
rate of the device when a master. SPR1 and SPR0 have no effect
on the slave. See Table 30 below.
Table 30:
SPCR - SPI control register (address D5H) clock rate selection
SPR1
SPR0
SCK = fosc divided by
0
0
4
0
1
16
1
0
64
1
1
128
Table 31: SPSR - SPI status register (address AAH) bit allocation
Bit addressable; Reset source(s): any reset; Reset value: 00000000B
Bit
Symbol
Table 32:
7
6
5
4
3
2
1
0
SPIF
WCOL
-
-
-
-
-
-
SPSR - SPI status register (address AAH) bit description
Bit
Symbol
Description
7
SPIF
SPI interrupt flag. Upon completion of data transfer, this bit is set to
‘1’. If SPIE = 1 and ES = 1, an interrupt is then generated. This bit
is cleared by software.
6
WCOL
Write Collision Flag. Set if the SPI data register is written to during
data transfer.
This bit is cleared by software.
5 to 0
-
Reserved for future use. Should be set to ‘0’ by user programs.
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SCK Cycle #
(for reference)
SCK (CPOL=0)
1
2
3
4
5
6
7
8
SCK (CPOL=1)
MOSI
(from Master)
MISO
(from Slave)
MSB
MSB
6
5
4
3
2
1
LSB
6
5
4
3
2
1
LSB
SS (to Slave)
002aaa529
Fig 17. SPI transfer format with CPHA = 0.
SCK Cycle #
(for reference)
SCK (CPOL=0)
1
2
3
4
5
6
7
8
SCK (CPOL=1)
MOSI
(from Master)
MSB
6
5
4
3
2
1
MISO
(from Slave)
MSB
6
5
4
3
2
1
LSB
LSB
SS (to Slave)
002aaa530
Fig 18. SPI transfer format with CPHA = 1.
7.7 Watchdog timer
The device offers a programmable Watchdog Timer (WDT) for fail safe protection
against software deadlock and automatic recovery.
To protect the system against software deadlock, the user software must refresh the
WDT within a user-defined time period. If the software fails to do this periodical
refresh, an internal hardware reset will be initiated if enabled (WDRE = 1). The
software can be designed such that the WDT times out if the program does not work
properly.
The WDT in the device uses the system clock (XTAL1) as its time base. So strictly
speaking, it is a Watchdog counter rather than a Watchdog timer. The WDT register
will increment every 344,064 crystal clocks. The upper 8-bits of the time base register
(WDTD) are used as the reload register of the WDT.
The WDTS flag bit is set by WDT overflow and is not changed by WDT reset. User
software can clear WDTS by writing ‘1' to it.
Figure 19 provides a block diagram of the WDT. Two SFRs (WDTC and WDTD)
control Watchdog timer operation. During idle mode, WDT operation is temporarily
suspended, and resumes upon an interrupt exit from idle.
The time-out period of the WDT is calculated as follows:
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Period = (255 − WDTD) × 344064 × 1/fCLK (XTAL1)
where WDTD is the value loaded into the WDTD register and fosc is the oscillator
frequency.
CLK (XTAL1)
344064
clks
COUNTER
WDT
UPPER BYTE
WDT reset
internal reset
external RST
WDTC
WDTD
002aaa531
Fig 19. Block diagram of programmable Watchdog timer
Table 33: WDTC - Watchdog control register (address COH) bit allocation
Bit addressable; Reset value: 00H
Bit
7
6
5
4
3
2
1
0
Symbol
-
-
-
WDOUT
WDRE
WDTS
WDT
SWDT
Table 34:
WDTC - Watchdog control register (address COH) bit description
Bit
Symbol
Description
7 to 5
-
Reserved for future use. Should be set to ‘0’ by user programs.
4
WDOUT
Watchdog output enable. When this bit and WDRE are both set, a
Watchdog reset will drive the reset pin active for 32 clocks.
3
WDRE
Watchdog timer reset enable. When set enables a Watchdog timer
reset.
2
WDTS
Watchdog timer reset flag, when set indicates that a WDT reset
occurred. Reset in software.
1
WDT
Watchdog timer refresh. Set by software to force a WDT reset.
0
SWDT
Start Watchdog timer, when set starts the WDT. When cleared,
stops the WDT.
7.8 Programmable Counter Array (PCA)
The PCA includes a special 16-bit Timer that has five 16-bit capture/compare
modules associated with it. Each of the modules can be programmed to operate in
one of four modes: rising and/or falling edge capture, software timer, high-speed
output, or pulse width modulator. Each module has a pin associated with it in port 1.
Module 0 is connected to P1.3 (CEX0), module 1 to P1.4 (CEX1), etc. Registers CH
and CL contain current value of the free running up counting 16-bit PCA timer. The
PCA timer is a common time base for all five modules and can be programmed to run
at: 1⁄6 the oscillator frequency, 1⁄2 the oscillator frequency, the Timer 0 overflow, or the
input on the ECI pin (P1.2). The timer count source is determined from the CPS1 and
CPS0 bits in the CMOD SFR (see Table 35 and Table 36).
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16 bits
MODULE0
P1.3/CEX0
16 bits
MODULE1
P1.4/CEX1
PCA TIMER/COUNTER
MODULE2
P1.5/CEX2
MODULE3
P1.6/CEX3
MODULE4
P1.7/CEX4
time base for PCA modules
Module functions:
16-bit capture
16-bit timer
16-bit high speed output
8-bit PWM
Watchdog timer (Module 4 only)
002aaa532
Fig 20.
In the CMOD SFR there are three additional bits associated with the PCA. They are
CIDL which allows the PCA to stop during idle mode, WDTE which enables or
disables the Watchdog function on module 4, and ECF which when set causes an
interrupt and the PCA overflow flag CF (in the CCON SFR) to be set when the PCA
timer overflows.
The Watchdog timer function is implemented in module 4 of PCA.
The CCON SFR contains the run control bit for the PCA (CR) and the flags for the
PCA timer (CF) and each module (CCF4:0). To run the PCA the CR bit (CCON.6)
must be set by software. The PCA is shut off by clearing this bit. The CF bit (CCON.7)
is set when the PCA counter overflows and an interrupt will be generated if the ECF
bit in the CMOD register is set. The CF bit can only be cleared by software. Bits 0
through 4 of the CCON register are the flags for the modules (bit 0 for module 0, bit 1
for module 1, etc.) and are set by hardware when either a match or a capture occurs.
These flags can only be cleared by software. All the modules share one interrupt
vector. The PCA interrupt system is shown in Figure 21.
Each module in the PCA has a special function register associated with it. These
registers are: CCAPM0 for module 0, CCAPM1 for module 1, etc. The registers
contain the bits that control the mode that each module will operate in.
The ECCF bit (from CCAPMn.0 where n = 0, 1, 2, 3, or 4 depending on the module)
enables the CCFn flag in the CCON SFR to generate an interrupt when a match or
compare occurs in the associated module (see Figure 21).
PWM (CCAPMn.1) enables the pulse width modulation mode.
The TOG bit (CCAPMn.2) when set causes the CEX output associated with the
module to toggle when there is a match between the PCA counter and the module’s
capture/compare register.
The match bit MAT (CCAPMn.3) when set will cause the CCFn bit in the CCON
register to be set when there is a match between the PCA counter and the module’s
capture/compare register.
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The next two bits CAPN (CCAPMn.4) and CAPP (CCAPMn.5) determine the edge
that a capture input will be active on. The CAPN bit enables the negative edge, and
the CAPP bit enables the positive edge. If both bits are set both edges will be enabled
and a capture will occur for either transition.
The last bit in the register ECOM (CCAPMn.6) when set enables the comparator
function.
There are two additional registers associated with each of the PCA modules. They
are CCAPnH and CCAPnL and these are the registers that store the 16-bit count
when a capture occurs or a compare should occur. When a module is used in the
PWM mode these registers are used to control the duty cycle of the output.
CF
CR
-
CCF4
CCF3
CCF2
CCF1
CCF0
CCON
(D8h)
PCA TIMER/COUNTER
MODULE0
IEN0.6
EC
MODULE1
IEN0.7
EA
MODULE2
to
interrupt
priority
decoder
MODULE3
MODULE4
CMOD.0
ECF
CCAPMn.0
ECCFn
002aaa533
Fig 21. PCA interrupt system.
Table 35: CMOD - PCA counter mode register (address D9H) bit allocation
Not bit addressable; Reset value: 00H
Bit
Symbol
7
6
5
4
3
2
1
0
CIDL
WDTE
-
-
-
CPS1
CPS0
ECF
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Table 36:
CMOD - PCA counter mode register (address D9H) bit description
Bit
Symbol
Description
7
CIDL
Counter Idle Control: CIDL = 0 programs the PCA Counter to
continue functioning during Idle Mode. CIDL = 1 programs it to be
gated off during idle.
6
WDTE
Watchdog Timer Enable: WDTE = 0 disables Watchdog timer
function on module 4. WDTE = 1 enables it.
5 to 3
-
Reserved for future use. Should be set to ‘0’ by user programs.
2 to 1
CPS1,
CPS0
PCA Count Pulse Select (see Table 37 below).
0
ECF
PCA Enable Counter Overflow Interrupt: ECF = 1 enables CF bit in
CCON to generate an interrupt. ECF = 0 disables that function.
Table 37:
CMOD - PCA counter mode register (address D9H) count pulse select
CPS1
CPS0
Select PCA input
0
0
0 Internal clock, fosc / 6
0
1
1 Internal clock, fosc / 6
1
0
2 Timer 0 overflow
1
1
3 External clock at ECI/P1.2 pin (max rate = fosc / 4)
Table 38: CCON - PCA counter control register (address 0D8H) bit allocation
Bit addressable; Reset value: 00H
Bit
Symbol
Table 39:
7
6
5
4
3
2
1
0
CF
CR
-
CCF4
CCF3
CCF2
CCF1
CCF0
CCON - PCA counter control register (address 0D8H) bit description
Bit
Symbol
Description
7
CF
PCA Counter Overflow Flag. Set by hardware when the counter
rolls over. CF flags an interrupt if bit ECF in CMOD is set. CF may
be set by either hardware or software but can only be cleared by
software.
6
CR
PCA Counter Run Control Bit. Set by software to turn the PCA
counter on. Must be cleared by software to turn the PCA counter
off.
5
-
Reserved for future use. Should be set to ‘0’ by user programs.
4
CCF4
PCA Module 4 Interrupt Flag. Set by hardware when a match or
capture occurs. Must be cleared by software.
3
CCF3
PCA Module 3 Interrupt Flag. Set by hardware when a match or
capture occurs. Must be cleared by software.
2
CCF2
PCA Module 2 Interrupt Flag. Set by hardware when a match or
capture occurs. Must be cleared by software.
1
CCF1
PCA Module 1 Interrupt Flag. Set by hardware when a match or
capture occurs. Must be cleared by software.
0
CCF0
PCA Module 0 Interrupt Flag. Set by hardware when a match or
capture occurs. Must be cleared by software.
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Table 40:
CCAPMn - PCA modules compare/capture register (address CCAPM0 0DAH,
CCAPM1 0DBH, CCAPM2 0DCH, CCAPM3 0DDH, CCAPM4 0DEH) bit alloc.
Not bit addressable; Reset value: 00H
Bit
7
6
5
4
3
2
1
0
Symbol
-
ECOMn
CAPPn
CAPNn
MATn
TOGn
PWMn
ECCFn
Table 41:
CCAPMn - PCA modules compare/capture register (address CCAPM0 0DAH,
CCAPM1 0DBH, CCAPM2 0DCH, CCAPM3 0DDH, CCAPM4 0DEH) bit desc.
Bit
Symbol
Description
7
-
Reserved for future use. Should be set to ‘0’ by user programs.
6
ECOMn
Enable Comparator. ECOMn = 1 enables the comparator function.
5
CAPPn
Capture Positive, CAPPn = 1 enables positive edge capture.
4
CAPNn
Capture Negative, CAPNn = 1 enables negative edge capture.
3
MATn
Match. When MATn = 1 a match of the PCA counter with this
module’s compare/capture register causes the CCFn bit in CCON
to be set, flagging an interrupt.
2
TOGn
Toggle. When TOGn = 1, a match of the PCA counter with this
module’s compare/capture register causes the CEXn pin to toggle.
1
PWMn
Pulse Width Modulation Mode. PWMn = 1 enables the CEXn pin to
be used as a pulse width modulated output.
0
ECCFn
Enable CCF Interrupt. Enables compare/capture flag CCFn in the
CCON register to generate an interrupt.
Table 42:
PCA module modes (CCAPMn register)
ECOMn
CAPPn
CAPNn
MATn
TOGn
PWMn
ECCFn
Module function
0
0
0
0
0
0
0
no operation
x
1
0
0
0
0
x
16-bit capture by a positive-edge trigger on
CEXn
x
0
1
0
0
0
x
16-bit capture by a negative-edge trigger on
CEXn
x
1
1
0
0
0
x
16-bit capture by any transition on CEXn
1
0
0
1
0
0
x
16-bit software timer
1
0
0
1
1
0
x
16-bit high speed output
1
0
0
0
0
1
0
8-bit PWM
1
0
0
1
x
0
x
Watchdog timer
7.8.1
PCA capture mode
To use one of the PCA modules in the capture mode (Figure 22) either one or both of
the CCAPM bits CAPN and CAPP for that module must be set. The external CEX
input for the module (on port 1) is sampled for a transition. When a valid transition
occurs the PCA hardware loads the value of the PCA counter registers (CH and CL)
into the module’s capture registers (CCAPnL and CCAPnH).
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CF
CR
-
CCF4
CCF3
CCF2
CCF1
CCF0
CCON
(C0h)
PCA
interrupt
(to CCFn)
PCA timer/counter
CH
CL
CAPTURE
CEXn
CCAPnH CCAPnL
-
ECOMn
CAPPn
0
CAPNn
MATn
TOGn
PWMn
0
0
0
ECCFn
CCAPMn, n = 0 to 4
(C2H to C6H)
002aaa538
Fig 22. PCA capture mode.
If the CCFn bit for the module in the CCON SFR and the ECCFn bit in the CCAPMn
SFR are set then an interrupt will be generated.
7.8.2
16-bit software timer mode
The PCA modules can be used as software timers (Figure 23) by setting both the
ECOM and MAT bits in the modules CCAPMn register. The PCA timer will be
compared to the module’s capture registers and when a match occurs an interrupt
will occur if the CCFn (CCON SFR) and the ECCFn (CCAPMn SFR) bits for the
module are both set.
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CF
write to
CCAPnH
0
-
CCF4
reset
CCAPnH
write to
CCAPnL
CR
CCF2
CCF1
CCF0
CCON
(C0h)
(to CCFn)
CCAPnL
PCA
interrupt
enable
1
CCF3
match
16-BIT COMPARATOR
CH
CL
PCA timer/counter
-
ECOMn
CAPPn
CAPNn
MATn
TOGn
PWMn
0
0
1
0
0
ECCFn
CCAPMn, n = 0 to 4
(C2H to C6H)
002aaa539
Fig 23. PCA compare mode.
7.8.3
High speed output mode
In this mode (Figure 24) the CEX output (on port 1) associated with the PCA module
will toggle each time a match occurs between the PCA counter and the module’s
capture registers. To activate this mode the TOG, MAT, and ECOM bits in the
module’s CCAPMn SFR must be set.
CF
write to
CCAPnH
0
1
-
CCF4
reset
CCAPnH
write to
CCAPnL
CR
CCF3
CCF2
CCF1
CCF0
CCON
(C0h)
(to CCFn)
CCAPnL
PCA
interrupt
enable
match
16-BIT COMPARATOR
CH
CL
PCA timer/counter
toggle
CEXn
-
ECOMn
CAPPn
CAPNn
MATn
TOGn
PWMn
0
0
1
1
0
ECCFn
CCAPMn, n = 0 to 4
(C2H to C6H)
002aaa540
Fig 24. PCA high speed output mode.
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7.8.4
Pulse width modulator mode
All of the PCA modules can be used as PWM outputs (Figure 25). Output frequency
depends on the source for the PCA timer.
CCAPnH
0
CCAPnL
CL<CCAPnL
enable
CEXn
8-BIT COMPARATOR
CL≥CCAPnL
1
CL
PCA timer/counter
-
ECOMn
CAPPn
CAPNn
MATn
TOGn
PWMn
ECCFn
1
0
0
0
0
1
1
CCAPMn, n = 0 to 4
(C2H to C6H)
002aaa541
Fig 25. PCA PWM mode.
All of the modules will have the same frequency of output because they all share one
and only PCA timer. The duty cycle of each module is independently variable using
the module’s capture register CCAPnL.When the value of the PCA CL SFR is less
than the value in the module’s CCAPnL SFR the output will be low, when it is equal to
or greater than the output will be high. When CL overflows from FF to 00, CCAPnL is
reloaded with the value in CCAPnH. this allows updating the PWM without glitches.
The PWM and ECOM bits in the module’s CCAPMn register must be set to enable
the PWM mode.
7.8.5
PCA Watchdog timer
An on-board Watchdog timer is available with the PCA to improve the reliability of the
system without increasing chip count. Watchdog timers are useful for systems that
are susceptible to noise, power glitches, or electrostatic discharge. Module 4 is the
only PCA module that can be programmed as a Watchdog. However, this module can
still be used for other modes if the Watchdog is not needed. Figure 25 shows a
diagram of how the Watchdog works. The user pre-loads a 16-bit value in the
compare registers. Just like the other compare modes, this 16-bit value is compared
to the PCA timer value. If a match is allowed to occur, an internal reset will be
generated. This will not cause the RST pin to be driven high.
user’s software then must periodically change (CCAP4H,CCAP4L) to keep a match
from occurring with the PCA timer (CH,CL). This code is given in the WATCHDOG
routine shown above.
In order to hold off the reset, the user has three options:
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1. Periodically change the compare value so it will never match the PCA timer.
2. Periodically change the PCA timer value so it will never match the compare
values.
3. Disable the Watchdog by clearing the WDTE bit before a match occurs and then
re-enable it.
The first two options are more reliable because the Watchdog timer is never disabled
as in option #3. If the program counter ever goes astray, a match will eventually occur
and cause an internal reset. The second option is also not recommended if other
PCA modules are being used. Remember, the PCA timer is the time base for all
modules; changing the time base for other modules would not be a good idea. Thus,
in most applications the first solution is the best option.
;CALL the following WATCHDOG subroutine periodically.
CLR
EA
;Hold off interrupts
MOV
CCAP4L,#00
;Next compare value is within 255 counts of
current PCA timer value
MOV
CCAP4H,CH
SETB
EA
;Re-enable interrupts
RET
This routine should not be part of an interrupt service routine, because if the program
counter goes astray and gets stuck in an infinite loop, interrupts will still be serviced
and the Watchdog will keep getting reset. Thus, the purpose of the Watchdog would
be defeated. Instead, call this subroutine from the main program within 216 count of
the PCA timer.
7.9 Security Bit
The Security Bit protects against software piracy and prevents the contents of the
flash from being read by unauthorized parties in Parallel Programmer Mode. It also
protects against code corruption resulting from accidental erasing and programming
to the internal flash memory.
When the Security Bit is activated all parallel programming commands except for
Chip-Erase are ignored (thus the device cannot be read). However, ISP reads of the
user’s code can still be performed if the serial number and length has not been
programmed. Therefore, when a user requests to program the Security Bit, the
programmer should prompt the user and program a serial number into the
device.
7.10 Reset
A system reset initializes the MCU and begins program execution at program memory
location 0000H. The reset input for the device is the RST pin. In order to reset the
device, a logic level high must be applied to the RST pin for at least two machine
cycles (24 clocks), after the oscillator becomes stable. ALE, PSEN are weakly pulled
high during reset. During reset, ALE and PSEN output a high level in order to perform
a proper reset. This level must not be affected by external element. A system reset
will not affect the 1 kbyte of on-chip RAM while the device is running, however, the
contents of the on-chip RAM during power up are indeterminate.
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7.10.1
Power-on Reset
At initial power up, the port pins will be in a random state until the oscillator has
started and the internal reset algorithm has weakly pulled all pins HIGH. Powering up
the device without a valid reset could cause the MCU to start executing instructions
from an indeterminate location. Such undefined states may inadvertently corrupt the
code in the flash.
When power is applied to the device, the RST pin must be held HIGH long enough for
the oscillator to start up (usually several milliseconds for a low frequency crystal), in
addition to two machine cycles for a valid power-on reset. An example of a method to
extend the RST signal is to implement a RC circuit by connecting the RST pin to VDD
through a 10 µF capacitor and to VSS through an 8.2 kΩ resistor as shown in
Figure 26. Note that if an RC circuit is being used, provisions should be made to
ensure the VDD rise time does not exceed 1 millisecond and the oscillator start-up
time does not exceed 10 milliseconds.
For a low frequency oscillator with slow start-up time the reset signal must be
extended in order to account for the slow start-up time. This method maintains the
necessary relationship between VDD and RST to avoid programming at an
indeterminate location, which may cause corruption in the code of the flash. The
power-on detection is designed to work as power-up initially, before the voltage
reaches the brown-out detection level. The POF flag in the PCON register is set to
indicate an initial power-up condition. The POF flag will remain active until cleared by
software. Please refer to the PCON register definition for detail information.
Following reset, the P89V51RD2 will either enter the SoftICE mode (if previously
enabled via ISP command) or attempt to autobaud to the ISP boot loader. If this
autobaud is not successful within about 400 ms, the device will begin execution of the
user code.
VDD
10 mF
VDD
RST
8.2 kW
C2
XTAL2
XTAL1
C1
002aaa543
Fig 26. Power-on reset circuit.
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7.10.2
Software reset
The software reset is executed by changing FCF[1] (SWR) from ‘0’ to ‘1’. A software
reset will reset the program counter to address 0000H. All SFR registers will be set to
their reset values, except FCF[1] (SWR), WDTC[2] (WDTS), and RAM data will not
be altered.
7.10.3
Brown-out detection reset
The device includes a brown-out detection circuit to protect the system from severed
supplied voltage VDD fluctuations. The P89V51RD2’s brown-out detection threshold
is 3.85 V. For brown-out voltage parameters, please refer to Table 67 and Table 68.
When VDD drops below this voltage threshold, the brown-out detector triggers the
circuit to generate a brown-out interrupt but the CPU still runs until the supplied
voltage returns to the brown-out detection voltage VBOD. The default operation for a
brown-out detection is to cause a processor reset.
VDD must stay below VBOD at least four oscillator clock periods before the brown-out
detection circuit will respond.
Brown-out interrupt can be enabled by setting the EBO bit in IEA register (address
E8H, bit 3). If EBO bit is set and a brown-out condition occurs, a brown-out interrupt
will be generated to execute the program at location 004BH. It is required that the
EBO bit be cleared by software after the brown-out interrupt is serviced. Clearing
EBO bit when the brown-out condition is active will properly reset the device. If
brown-out interrupt is not enabled, a brown-out condition will reset the program to
resume execution at location 0000H.
7.10.4
Interrupt priority and polling sequence
The device supports eight interrupt sources under a four level priority scheme.
Table 43 summarizes the polling sequence of the supported interrupts. Note that the
SPI serial interface and the UART share the same interrupt vector. (See Figure 27).
Table 43:
Interrupt polling sequence
Description
Interrupt Flag
Vector
Address
Interrupt
Enable
Interrupt
Priority
Service
Priority
Wake-Up
Power-down
Ext. Int0
IE0
0003H
EX0
PX0/H
1 (highest)
yes
Brown-out
-
004BH
EBO
PBO/H
2
no
T0
TF0
000BH
ET0
PT0/H
3
no
Ext. Int1
IE1
0013H
EX1
PX1/H
4
yes
T1
TF1
001BH
ET1
PT1/H
5
no
PCA
CF/CCFn
0033H
EC
PPCH
6
no
UART/SPI
TI/RI/SPIF
0023H
ES
PS/H
7
no
T2
TF2, EXF2
002BH
ET2
PT2/H
8
no
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IP/IPH/IPA/IPAH
Registers
IE & IEA
Registers
Highest
Priority
Interrupt
0
INT0#
IT0
IE0
1
Brown-out
Interrupt
Polling
Sequence
TF0
0
INT1#
IT1
IE1
1
TF1
ECF
CF
CCFn
ECCFn
RI
TI
SPIF
SPIE
TF2
EXF2
Individual
Enables
Global
Disable
Lowest
Priority
Interrup
002aaa544
Fig 27. Interrupt structure.
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Table 44: IEN0 - Interrupt enable register 0 (address A8H) bit allocation
Bit addressable; Reset value: 00H
Bit
Symbol
Table 45:
7
6
5
4
3
2
1
0
EA
EC
ET2
ES
ET1
EX1
ET0
EX0
IEN0 - Interrupt enable register 0 (address A8H) bit description
Bit
Symbol
Description
7
EA
Interrupt Enable Bit: EA = 1 interrupt(s) can be serviced, EA = 0
interrupt servicing disabled.
6
EC
PCA Interrupt Enable bit.
5
ET2
Timer 2 Interrupt Enable.
4
ES
Serial Port Interrupt Enable
3
ET1
Timer 1 Overflow Interrupt Enable.
2
EX1
External Interrupt 1 Enable.
1
ET0
Timer 0 Overflow Interrupt Enable.
0
EX0
External Interrupt 0 Enable.
Table 46: IEN1 - Interrupt enable register 1 (address E8H) bit allocation
Bit addressable; Reset value: 00H
Bit
7
6
5
4
3
2
1
0
Symbol
-
-
-
-
EBO
-
-
-
Table 47:
IEN1 - Interrupt enable register 1 (address E8H) bit description
Bit
Symbol
Description
7 to 4
-
Reserved for future use. Should be set to ‘0’ by user programs.
3
EBO
Brown-out Interrupt Enable. 1 = enable, 0 = disable.
2 to 0
-
Reserved for future use. Should be set to ‘0’ by user programs.
Table 48: IP0 - Interrupt priority 0 low register (address B8H) bit allocation
Bit addressable; Reset value: 00H
Bit
7
6
5
4
3
2
1
0
Symbol
-
PPC
PT2
PS
PT1
PX1
PT0
PX0
Table 49:
IP0 - Interrupt priority 0 low register (address B8H) bit description
Bit
Symbol
Description
7
-
Reserved for future use. Should be set to ‘0’ by user programs.
6
PPC
PCA Interrupt Priority Low Bit.
5
PT2
Timer 2 Interrupt Priority Low Bit.
4
PS
Serial Port Interrupt Priority Low Bit.
3
PT1
Timer 1 Interrupt Priority Low Bit.
2
PX1
External Interrupt 1 Priority Low Bit.
1
PT0
Timer 0 Interrupt Priority Low Bit.
0
PX0
External Interrupt 0 Priority Low Bit.
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Table 50: IP0H - Interrupt priority 0 high register (address B7H) bit allocation
Not bit addressable; Reset value: 00H
Bit
7
6
5
4
3
2
1
0
Symbol
-
PPCH
PT2H
PSH
PT1H
PX1H
PT0H
PX0H
Table 51:
IP0H - Interrupt priority 0 high register (address B7H) bit description
Bit
Symbol
Description
7
-
Reserved for future use. Should be set to ‘0’ by user programs.
6
PPCH
PCA Interrupt Priority High Bit.
5
PT2H
Timer 2 Interrupt Priority High Bit.
4
PSH
Serial Port Interrupt Priority High Bit.
3
PT1H
Timer 1 Interrupt Priority High Bit.
2
PX1H
External Interrupt 1 Priority High Bit.
1
PT0H
Timer 0 Interrupt Priority High Bit.
0
PX0H
External Interrupt 0 Priority High Bit.
Table 52: IP1 - Interrupt priority 1 register (address F8H) bit allocation
Bit addressable; Reset value: 00H
Bit
7
6
5
4
3
2
1
0
Symbol
-
-
-
PBO
-
-
-
-
Table 53:
IP1 - Interrupt priority 1 register (address F8H) bit description
Bit
Symbol
Description
7 to 5
-
Reserved for future use. Should be set to ‘0’ by user programs.
4
PBO
Brown-out interrupt priority bit.
3 to 0
-
Reserved for future use. Should be set to ‘0’ by user programs.
Table 54: IP1H - Interrupt priority 1 high register (address F7H) bit allocation
Not bit addressable; Reset value: 00H
Bit
7
6
5
4
3
2
1
0
Symbol
-
-
-
PBOH
-
-
-
-
Table 55:
IP1H - Interrupt priority 1 high register (address F7H) bit description
Bit
Symbol
Description
7 to 5
-
Reserved for future use. Should be set to ‘0’ by user programs.
4
PBOH
Brown-out interrupt priority bit.
3 to 0
-
Reserved for future use. Should be set to ‘0’ by user programs.
7.11 Power-saving modes
The device provides two power saving modes of operation for applications where power
consumption is critical. The two modes are idle and Power-down, see Table 56.
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7.11.1
Idle mode
Idle mode is entered setting the IDL bit in the PCON register. In idle mode, the program
counter (PC) is stopped. The system clock continues to run and all interrupts and peripherals
remain active. The on-chip RAM and the special function registers hold their data during this
mode.
The device exits idle mode through either a system interrupt or a hardware reset. Exiting idle
mode via system interrupt, the start of the interrupt clears the IDL bit and exits idle mode.
After exit the Interrupt Service Routine, the interrupted program resumes execution
beginning at the instruction immediately following the instruction which invoked the idle
mode. A hardware reset starts the device similar to a power-on reset.
7.11.2
Power-down mode
The Power-down mode is entered by setting the PD bit in the PCON register. In the
Power-down mode, the clock is stopped and external interrupts are active for level
sensitive interrupts only. SRAM contents are retained during Power-down, the
minimum VDD level is 2.0 V.
The device exits Power-down mode through either an enabled external level sensitive
interrupt or a hardware reset. The start of the interrupt clears the PD bit and exits
Power-down. Holding the external interrupt pin low restarts the oscillator, the signal
must hold low at least 1024 clock cycles before bringing back high to complete the
exit. Upon interrupt signal restored to logic VIH, the interrupt service routine program
execution resumes beginning at the instruction immediately following the instruction
which invoked Power-down mode. A hardware reset starts the device similar to
power-on reset.
To exit properly out of Power-down, the reset or external interrupt should not be
executed before the VDD line is restored to its normal operating voltage. Be sure to
hold VDD voltage long enough at its normal operating level for the oscillator to restart
and stabilize (normally less than 10 ms).
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Table 56:
Power-saving modes
Mode
Initiated by
State of MCU
Exited by
Idle Mode
Software
(Set IDL bit in PCON)
MOV PCON, #01H;
CLK is running.
Interrupts, serial port and
timers/counters are active.
Program Counter is stopped.
ALE and PSEN signals at a
HIGH level during Idle. All
registers remain unchanged.
Enabled interrupt or hardware reset. Start of
interrupt clears IDL bit and exits idle mode,
after the ISR RETI instruction, program
resumes execution beginning at the
instruction following the one that invoked
idle mode. A user could consider placing
two or three NOP instructions after the
instruction that invokes idle mode to
eliminate any problems. A hardware reset
restarts the device similar to a power-on
reset.
Power-down
Mode
Software
(Set PD bit in PCON)
MOV PCON, #02H;
CLK is stopped. On-chip SRAM
and SFR data is maintained.
ALE and PSEN signals at a
LOW level during power -down.
External Interrupts are only
active for level sensitive
interrupts, if enabled.
Enabled external level sensitive interrupt or
hardware reset. Start of interrupt clears PD
bit and exits Power-down mode, after the
ISR RETI instruction program resumes
execution beginning at the instruction
following the one that invoked Power-down
mode. A user could consider placing two or
three NOP instructions after the instruction
that invokes Power-down mode to eliminate
any problems. A hardware reset restarts the
device similar to a power-on reset.
7.12 System clock and clock options
7.12.1
Clock Input Options and Recommended Capacitor Values for Oscillator
Shown in Figure 28 are the input and output of an internal inverting amplifier (XTAL1,
XTAL2), which can be configured for use as an on-chip oscillator.
When driving the device from an external clock source, XTAL2 should be left
disconnected and XTAL1 should be driven.
At start-up, the external oscillator may encounter a higher capacitive load at XTAL1
due to interaction between the amplifier and its feedback capacitance. However, the
capacitance will not exceed 15 pF once the external signal meets the VIL and VIH
specifications.
Crystal manufacturer, supply voltage, and other factors may cause circuit
performance to differ from one application to another. C1 and C2 should be adjusted
appropriately for each design. Table 57 shows the typical values for C1 and C2 vs.
crystal type for various frequencies
Table 57:
Recommended values for C1 and C2 by crystal type
Crystal
C1 = C2
Quartz
20 pF to 30 pF
Ceramic
40 pF to 50 pF
More specific information about on-chip oscillator design can be found in the
FlashFlex51 Oscillator Circuit Design Considerations application note.
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7.12.2
Clock doubling option
By default, the device runs at 12 clocks per machine cycle (x1 mode). The device has
a clock doubling option to speed up to 6 clocks per machine cycle (please see
Table 58). Clock double mode can be enabled either by an external programmer or
using IAP. When set, the EDC bit in FST register will indicate 6 clock mode.
The clock double mode is only for doubling the internal system clock and the internal
flash memory, i.e. EA = 1. To access the external memory and the peripheral devices,
careful consideration must be taken. Also note that the crystal output (XTAL2) will not
be doubled.
C2
NC
XTAL2
external
oscillator
signal
XTAL1
XTAL2
XTAL1
C1
VSS
VSS
002aaa543
002aaa546
Using the on-chip oscillator
External clock drive
Fig 28. Oscillator characteristics.
Table 58:
Clock doubling features
Device
Standard mode (x1)
P89V51RD2
Clock double mode (x2)
Clocks per
machine cycle
Max. external
Clocks per
clock frequency machine cycle
(MHz)
Max. external
clock frequency
(MHz)
12
40
20
6
Table 59: FST - Flash status register (address B6) bit allocation
Not Bit addressable; Reset value: xxxxx0xxB
Bit
7
6
5
4
3
2
1
0
Symbol
-
SB
-
-
EDC
-
-
-
Table 60:
FST - Flash status register (address B6) bit description
Bit
Symbol
Description
7
-
Reserved for future use. Should be set to ‘0’ by user programs.
6
SB
Security bit.
5 to 4
-
Reserved for future use. Should be set to ‘0’ by user programs.
3
EDC
Enable double clock.
2 to 0
-
Reserved for future use. Should be set to ‘0’ by user programs.
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8. Limiting values
Table 61: Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Parameters are valid over operating temperature range unless otherwise specified. All voltages are with respect to VSS unless
otherwise noted.
Symbol
Parameter
Tamb(bias)
Conditions
Min
Max
Unit
operating bias ambient temperature
−55
+125
°C
Tstg
storage temperature range
−65
+150
°C
VEA
voltage on EA pin to VSS
−0.5
14
V
Vn
DC voltage on any pin to ground
potential
−0.5
VDD + 0.5
V
Vit
transient voltage (<20 ns) on any
other pin to VSS
−1.0
VDD + 1.0
V
IOL(I/O)
maximum IOL per I/O pins P1.5, P1.6,
P1.7
-
20
mA
IOL(I/O)
maximum IOL per I/O for all other pins
-
15
mA
Ptot(pack)
total power dissipation per package
Tamb = 25 °C
-
1.5
W
through hole lead soldering
temperature
10 seconds
-
300
°C
surface mount lead soldering
temperature
3 seconds
-
240
°C
-
50
mA
[1]
output short circuit current
[1]
Outputs shorted for no more than one second. No more than one output shorted at a time. (Based on package heat transfer limitations,
not device power consumption.)
9. Recommended operating conditions
Table 62:
Operating range
Symbol
Description
Tamb
ambient temperature under bias
Max
Unit
commercial
0
+70
°C
industrial
−40
+85
°C
VDD
supply voltage
4.5
5.5
V
fosc
oscillator frequency
0
40
MHz
oscillator frequency for
in-application programming
0.25
40
MHz
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Table 63:
Reliability characteristics
Symbol
Parameter
Minimum
specification
Units
Test method
NEND[1]
endurance
10,000
cycles
JEDEC Standard A117
TDR[1]
data retention
100
years
JEDEC Standard A103
ILTH[1]
latch up
100 + IDD
mA
JEDEC Standard 78
[1]
This parameter is measured only for initial qualification and after a design or process change that
could affect this parameter.
Table 64:
AC conditions of test[1]
Input rise/fall time
10 ns
Output load
CL = 100 pf
[1]
See Figure 35 and Figure 37.
Table 65:
Recommended system power-up timings
Symbol
Parameter
Minimum
Unit
TPU-READ[1]
Power-up to read operation
100
µs
TPU-WRITE[1]
Power-up to write operation
100
µs
[1]
This parameter is measured only for initial qualification and after a design or process change that
could affect this parameter.
Table 66: Pin impedance
(VDD = 3.3 V, Tamb = 25 °C, f = 1 MHz, other pins open)
Parameter
Description
Test condition
Maximum
Unit
CI/O[1]
I/O pin capacitance
VI/O = 0 V
15
pF
CIN
input capacitance
VIN = 0 V
LPIN
pin inductance
[1]
[1]
pF
nH
This parameter is measured only for initial qualification and after a design or process change that
could affect this parameter.
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10. Static characteristics
Table 67: DC electrical characteristics
Tamb = 0 °C to +70 °C or −40 °C to +85 °C; VDD = 4.5 V to 5.5 V; VSS = 0 V
Symbol
Parameter
Conditions
Min
Max
Unit
VIL
LOW-level input voltage
4.5 V < VDD < 5.5 V
−0.5
0.2VDD − 0.1
V
VIH
HIGH-level input voltage
4.5 V < VDD < 5.5 V
0.2VDD + 0.9
VDD + 0.5
V
VIH1
HIGH-level input voltage (XTAL1,
RST)
4.5 V < VDD < 5.5 V
0.7VDD
VDD + 0.5
V
VOL
LOW-level output voltage (ports 1.5, VDD = 4.5 V; IOL = 16 mA
1.6, 1.7)
-
1.0
V
VOL
LOW-level output voltage (ports 1, 2, VDD = 4.5 V
3)[1]
IOL = 100 µA
-
0.3
V
IOL = 1.6 mA
-
0.45
V
IOL = 3.5 mA
-
1.0
V
VOL1
VOH
VOH1
LOW-level output voltage (Port 0,
ALE, PSEN)[1][3]
HIGH-level output voltage (ports 1,
2, 3, ALE, PSEN)[4]
HIGH-level output voltage (Port 0 in
External Bus Mode)[4]
VDD = 4.5 V
IOL = 200 µA
-
0.3
V
IOL = 3.2 mA
-
0.45
V
IOH = -10 µA
VDD − 0.3
-
V
IOH = -30 µA
VDD − 0.7
-
V
IOH = -60 µA
VDD − 1.5
-
V
IOH = -200 µA
VDD − 0.3
-
V
IOH = -3.2 mA
VDD − 0.7
-
V
3.85
4.15
V
VDD = 4.5 V
VDD = 4.5 V
VBOD
brown-out detection voltage
IIL
logic 0 input current (ports 1, 2, 3)
VIN = 0.4 V
-
−75
µA
ITL
logic 1-to-0 transition current
(ports 1, 2, 3)[5]
VIN = 2 V
-
−650
µA
ILI
input leakage current (Port 0)
0.45 V < VIN < VDD − 0.3 V
-
±10
µA
RRST
RST pull-down resistor
40
225
kΩ
@ 1 MHz, Tamb = 25 °C
-
15
pF
@ 12 MHz
-
11.5
mA
@ 40 MHz
-
50
mA
@ 12 MHz
-
8.5
mA
@ 40 MHz
-
42
mA
Tamb = 0 °C to +70 °C
-
80
µA
Tamb = −40 °C to +85 °C
-
90
µA
capacitance[6]
CIO
pin
IDD
power supply current
active mode
idle mode
Power-down mode
(min. VDD = 2 V)
[1]
Under steady state (non-transient) conditions, IOL must be externally limited as follows:
a) Maximum IOL per 8-bit port: 26 mA
b) Maximum IOL total for all outputs: 71 mA
c) If IOL exceeds the test condition, VOH may exceed the related specification. Pins are not guaranteed to sink current greater than the
listed test conditions.
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8-bit microcontrollers with 80C51 core
[2]
[3]
[4]
[5]
[6]
Capacitive loading on Ports 0 and 2 may cause spurious noise to be superimposed on the VOLs of ALE and Ports 1 and 3. The noise
due to external bus capacitance discharging into the Port 0 and 2 pins when the pins make 1-to-0 transitions during bus operations. In
the worst cases (capacitive loading > 100 pF), the noise pulse on the ALE pin may exceed 0.8 V. In such cases, it may be desirable to
qualify ALE with a Schmitt Trigger, or use an address latch with a Schmitt Trigger STROBE input.
Load capacitance for Port 0, ALE and PSEN = 100 pF, load capacitance for all other outputs = 80 pF.
Capacitive loading on Ports 0 and 2 may cause the VOH on ALE and PSEN to momentarily fall below the VDD − 0.7 specification when
the address bits are stabilizing.
Pins of Ports 1, 2 and 3 source a transition current when they are being externally driven from 1 to 0. The transition current reaches its
maximum value when VIN is approximately 2 V.
Pin capacitance is characterized but not tested. EA = 25 pF (max).
50
Maximum Active IDD
IDD (mA)
40
30
Maximum Idle IDD
20
Typical Active IDD
10
Typical Idle IDD
0
5
10
15
20
25
30
35
40
Internal Clock Frequency (MHz)
002aaa813
Fig 29. IDD vs. frequency.
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11. Dynamic characteristics
Table 68: AC characteristics
Over operating conditions: load capacitance for Port 0, ALE, and PSEN = 100 pF; load capacitance for all other
outputs = 80 pF
Tamb = 0 °C to +70 °C or −40 °C to +85 °C; VDD = 4.5 V to 5.5 V @ 40 MHz; VSS = 0 V
Symbol
Parameter
40 MHz (X1 mode)
20 MHz (X2 mode)[1]
Variable
Unit
Min
Max
Min
Max
1/TCLCL
X1 Mode oscillator frequency
0
40
0
40
MHz
1/2TCLCL
X2 Mode oscillator frequency
0
20
0
20
MHz
tLHLL
ALE pulse width
35
-
2TCLCL − 15
-
ns
tAVLL
address valid to ALE LOW
10
-
TCLCL − 15
-
ns
tLLAX
address hold after ALE LOW
10
-
TCLCL − 15
-
ns
tLLIV
ALE LOW to valid instruction in
-
55
-
4TCLCL − 45
ns
tLLPL
ALE LOW to PSEN LOW
10
-
TCLCL − 15
-
ns
tPLPH
PSEN pulse width
60
-
TCLCL − 15
-
ns
tPLIV
PSEN LOW to valid instruction in
-
25
-
3TCLCL − 50
ns
tPXIX
input instruction hold after PSEN
-
-
0
-
ns
tPXIZ
input instruction float after PSEN
-
10
-
TCLCL − 15
ns
tPXAV
PSEN to address valid
17
-
TCLCL − 8
-
ns
tAVIV
address to valid instruction in
-
65
-
5TCLCL − 60
ns
tPLAZ
PSEN LOW to address float
-
10
-
10
ns
tRLRH
RD pulse width
120
-
6TCLCL − 30
-
ns
tWLWH
write pulse width (WR)
120
-
6TCLCL − 30
-
ns
tRLDV
RD LOW to valid data in
-
75
-
5TCLCL − 50
ns
tRHDX
data hold after RD
0
-
0
-
ns
tRHDZ
data float after RD
-
38
-
2TCLCL − 12
ns
tLLDV
ALE LOW to valid data in
-
150
-
8TCLCL − 50
ns
tAVDV
address to valid data in
-
150
-
9TCLCL − 75
ns
tLLWL
ALE LOW to RD or WR LOW
60
90
3TCLCL − 15
3TCLCL + 15
ns
tAVWL
address to RD or WR LOW
70
-
4TCLCL − 30
-
ns
tWHQX
data hold after WR
5
-
TCLCL − 20
-
ns
tQVWH
data valid to WR HIGH
125
-
7TCLCL − 50
-
ns
tRLAZ
RD LOW to address float
-
0
-
0
ns
tWHLH
RD to WR HIGH to ALE HIGH
10
40
TCLCL − 15
TCLCL + 15
ns
[1]
Calculated values are for X1 mode only.
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11.1 Explanation of symbols
Each timing symbol has 5 characters. The first character is always a ‘T’ (stands for
time). The other characters, depending on their positions, stand for the name of a
signal or the logical status of that signal. The following is a list of all the characters
and what they stand for.
A — Address
C — Clock
D — Input data
H — Logic level HIGH
I — Instruction (program memory contents)
L — Logic level LOW or ALE
P — PSEN
Q — Output data
R — RD signal
T — Time
V — Valid
W — WR signal
X — No longer a valid logic level
Z — High impedance (Float)
Example:
TAVLL = Time from Address Valid to ALE LOW
TLLPL = Time from ALE LOW to PSEN LOW
tLHLL
ALE
tAVLL
tLLIV
tLLPL
tPLPH
tPLIV
PSEN
tPXAV
tPLAZ
tLLAX
tPXIZ
tPXIX
PORT 0
A0 - A7
INSTR IN
A0 - A7
tAVIV
PORT 2
A8 - A15
A8 - A15
002aaa548
Fig 30. External program memory read cycle.
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tLHLL
ALE
tWHLH
PSEN
tWLWH
tLLWL
WR
tLLAX
tWHQX
tAVLL
tQVWH
PORT 0
A0-A7 FROM RI or DPL
DATA OUT
A0-A7 FROM PCL
INSTR IN
tAVWL
PORT 2
P2[7:0] or A8-A15 FROM DPH
A8-A15 FROM PCH
002aaa549
Fig 31. External data memory read cycle.
tLHLL
ALE
tWHLH
PSEN
tWLWH
tLLWL
WR
tLLAX
tWHQX
tAVLL
tQVWH
PORT 0
A0-A7 FROM RI or DPL
DATA OUT
A0-A7 FROM PCL
INSTR IN
tAVWL
PORT 2
P2[7:0] or A8-A15 FROM DPH
A8-A15 FROM PCH
002aaa550
Fig 32. External data memory write cycle.
Table 69:
External clock drive
Symbol
Parameter
Oscillator
Unit
40 MHz
1/TCLCL
oscillator frequency
tCLCL
tCHCX
high time
Variable
Min
Max
Min
Max
-
-
0
40
MHz
25
-
-
-
ns
8.75
-
0.35TCLCL
0.65TCLCL
ns
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Table 69:
External clock drive…continued
Symbol
Parameter
Oscillator
Unit
40 MHz
Variable
Min
Max
Min
Max
8.75
-
0.35TCLCL
0.65TCLCL
tCLCX
low time
tCLCH
rise time
-
10
-
-
ns
tCHCL
fall time
-
10
-
-
ns
VDD - 0.5
ns
0.7VDD
tCHCX
0.2 VDD - 0.1
0.45 V
tCLCX
tCLCH
tCLCL
tCHCL
002aaa551
Fig 33. External clock drive waveform.
Table 70:
Serial port timing
Symbol
Parameter
Oscillator
Unit
40 MHz
Variable
Min
Max
Min
Max
tXLXL
serial port clock cycle time
0.3
-
12tCLCL
-
µs
tQVXH
output data set-up to clock rising
edge
117
-
10tCLCL − 133
-
ns
tXHQX
output data hold after clock rising
edge
0
-
2tCLCL − 50
-
ns
tXHDX
input data hold after clock rising
edge
0
-
0
-
ns
tXHDV
clock rising edge to input data valid
-
117
-
10tCLCL − 133
ns
INSTRUCTION
0
1
2
3
4
5
6
7
8
ALE
tXLXL
CLOCK
tXHQX
tQVXH
OUTPUT DATA
WRITE TO SBUF
INPUT DATA
0
1
2
3
4
5
6
7
tXHDX
tXHDV
VALID
VALID
VALID
SET TI
VALID
VALID
VALID
VALID
VALID
SET R I
CLEAR RI
002aaa552
Fig 34. Shift register mode timing waveforms.
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VIHT
VHT
VLT
VILT
Note: VHT- VHIGH Test
VLT- VLOW Test
VIHT-VINPUT HIGH Test
VILT- VINPUT LOW Test
002aaa553
AC inputs during testing are driven at VIHT (VDD − 0.5 V) for logic 1 and VILT (0.45 V) for a logic 0. Measurement reference
points for inputs and outputs are at VHT (0.2VDD + 0.9) and VLT (0.2VDD − 0.1)
Fig 35. AC testing input/output test waveform.
VLOAD + 0.1V
VOH - 0.1V
Timing Reference
Points
VLOAD
VOL + 0.1V
VLOAD - 0.1V
002aaa554
For timing purposes, a port pin is no longer floating when a 100 mV change from load voltage occurs, and begins to float when
a 100 mV change from the loaded VOH/VOL level occurs. IOH/IOL = ± 20 mA.
Fig 36. Float waveform.
to tester
to DUT
CL
002aaa555
Fig 37. Test load example.
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VDD
VDD
P0
VDD
RST
CLOCK
SIGNAL
VDD
IDD
EA
XTAL2
XTAL1
VSS
(NC)
002aaa556
All other pins disconnected
Fig 38. IDD test condition, active mode.
VDD
VDD
IDD
VDD
P0
RST
CLOCK
SIGNAL
EA
XTAL2
XTAL1
VSS
(NC)
002aaa557
All other pins disconnected
Fig 39. IDD test condition, idle mode.
VDD = 2 V
VDD
VDD
IDD
VDD
P0
RST
(NC)
EA
XTAL2
XTAL1
VSS
002aaa558
All other pins disconnected
Fig 40. IDD test condition, Power-down mode.
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12. Package outline
seating plane
DIP40: plastic dual in-line package; 40 leads (600 mil)
SOT129-1
ME
D
A2
L
A
A1
c
e
Z
w M
b1
(e 1)
b
MH
21
40
pin 1 index
E
1
20
0
5
10 mm
scale
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
UNIT
A
max.
A1
min.
A2
max.
b
b1
c
mm
4.7
0.51
4
1.70
1.14
0.53
0.38
0.36
0.23
52.5
51.5
inches
0.19
0.02
0.16
0.067
0.045
0.021
0.015
0.014
0.009
2.067
2.028
D
e
e1
L
ME
MH
w
Z (1)
max.
14.1
13.7
2.54
15.24
3.60
3.05
15.80
15.24
17.42
15.90
0.254
2.25
0.56
0.54
0.1
0.6
0.14
0.12
0.62
0.60
0.69
0.63
0.01
0.089
(1)
E
(1)
Note
1. Plastic or metal protrusions of 0.25 mm (0.01 inch) maximum per side are not included.
REFERENCES
OUTLINE
VERSION
IEC
JEDEC
JEITA
SOT129-1
051G08
MO-015
SC-511-40
EUROPEAN
PROJECTION
ISSUE DATE
99-12-27
03-02-13
Fig 41. PDIP40 package outline.
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TQFP44: plastic thin quad flat package; 44 leads; body 10 x 10 x 1.0 mm
SOT376-1
c
y
X
A
33
23
34
22
ZE
e
E HE
A A2
w M
(A 3)
A1
θ
bp
pin 1 index
Lp
L
detail X
12
44
11
1
ZD
e
v M A
w M
bp
D
B
HD
v M B
0
2.5
5 mm
scale
DIMENSIONS (mm are the original dimensions)
UNIT
A
max.
A1
A2
A3
bp
c
D (1)
E (1)
e
mm
1.2
0.15
0.05
1.05
0.95
0.25
0.45
0.30
0.18
0.12
10.1
9.9
10.1
9.9
0.8
HD
HE
12.15 12.15
11.85 11.85
L
Lp
v
w
y
1
0.75
0.45
0.2
0.2
0.1
Z D(1) Z E(1)
1.2
0.8
1.2
0.8
θ
o
7
0o
Note
1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.
REFERENCES
OUTLINE
VERSION
IEC
SOT376-1
137E08
JEDEC
JEITA
EUROPEAN
PROJECTION
ISSUE DATE
00-01-19
02-03-14
MS-026
Fig 42. TQFP44 package outline.
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8-bit microcontrollers with 80C51 core
PLCC44: plastic leaded chip carrier; 44 leads
SOT187-2
eD
eE
y
X
39
A
29
28
40
bp
ZE
b1
w M
44
1
E
HE
pin 1 index
A
A4 A1
e
(A 3)
6
β
18
Lp
k
7
detail X
17
e
v M A
ZD
D
B
HD
v M B
0
5
10 mm
scale
DIMENSIONS (mm dimensions are derived from the original inch dimensions)
A4
A1
UNIT A
A3
D(1) E(1)
e
eD
eE
HD
bp b1
max.
min.
4.57
4.19
mm
0.51
0.180
inches
0.02
0.165
0.53
0.33
0.81
0.66
HE
k
16.66 16.66
16.00 16.00 17.65 17.65 1.22
1.27
16.51 16.51
14.99 14.99 17.40 17.40 1.07
0.25
3.05
0.01
0.021 0.032 0.656 0.656
0.05
0.12
0.013 0.026 0.650 0.650
0.63
0.59
0.63
0.59
Lp
v
w
y
1.44
1.02
0.18
0.18
0.1
ZD(1) ZE(1)
max. max.
2.16
β
2.16
45 o
0.695 0.695 0.048 0.057
0.007 0.007 0.004 0.085 0.085
0.685 0.685 0.042 0.040
Note
1. Plastic or metal protrusions of 0.25 mm (0.01 inch) maximum per side are not included.
REFERENCES
OUTLINE
VERSION
IEC
JEDEC
JEITA
SOT187-2
112E10
MS-018
EDR-7319
EUROPEAN
PROJECTION
ISSUE DATE
99-12-27
01-11-14
Fig 43. PLCC44 package outline.
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13. Revision history
Table 71:
Revision history
Rev Date
01
20040301
CPCN
Description
-
Product data (9397 750 12964)
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14. Data sheet status
Level
Data sheet status[1]
Product status[2][3]
Definition
I
Objective data
Development
This data sheet contains data from the objective specification for product development. Philips
Semiconductors reserves the right to change the specification in any manner without notice.
II
Preliminary data
Qualification
This data sheet contains data from the preliminary specification. Supplementary data will be published
at a later date. Philips Semiconductors reserves the right to change the specification without notice, in
order to improve the design and supply the best possible product.
III
Product data
Production
This data sheet contains data from the product specification. Philips Semiconductors reserves the
right to make changes at any time in order to improve the design, manufacturing and supply. Relevant
changes will be communicated via a Customer Product/Process Change Notification (CPCN).
[1]
Please consult the most recently issued data sheet before initiating or completing a design.
[2]
The product status of the device(s) described in this data sheet may have changed since this data sheet was published. The latest information is available on the Internet at
URL http://www.semiconductors.philips.com.
[3]
For data sheets describing multiple type numbers, the highest-level product status determines the data sheet status.
15. Definitions
16. Disclaimers
Short-form specification — The data in a short-form specification is
extracted from a full data sheet with the same type number and title. For
detailed information see the relevant data sheet or data handbook.
Life support — These products are not designed for use in life support
appliances, devices, or systems where malfunction of these products can
reasonably be expected to result in personal injury. Philips Semiconductors
customers using or selling these products for use in such applications do so
at their own risk and agree to fully indemnify Philips Semiconductors for any
damages resulting from such application.
Limiting values definition — Limiting values given are in accordance with
the Absolute Maximum Rating System (IEC 60134). Stress above one or
more of the limiting values may cause permanent damage to the device.
These are stress ratings only and operation of the device at these or at any
other conditions above those given in the Characteristics sections of the
specification is not implied. Exposure to limiting values for extended periods
may affect device reliability.
Application information — Applications that are described herein for any
of these products are for illustrative purposes only. Philips Semiconductors
make no representation or warranty that such applications will be suitable for
the specified use without further testing or modification.
Right to make changes — Philips Semiconductors reserves the right to
make changes in the products - including circuits, standard cells, and/or
software - described or contained herein in order to improve design and/or
performance. When the product is in full production (status ‘Production’),
relevant changes will be communicated via a Customer Product/Process
Change Notification (CPCN). Philips Semiconductors assumes no
responsibility or liability for the use of any of these products, conveys no
licence or title under any patent, copyright, or mask work right to these
products, and makes no representations or warranties that these products are
free from patent, copyright, or mask work right infringement, unless otherwise
specified.
Contact information
For additional information, please visit http://www.semiconductors.philips.com.
For sales office addresses, send e-mail to: [email protected].
Product data
Fax: +31 40 27 24825
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
9397 750 12964
Rev. 01 — 01 March 2004
74 of 75
P89V51RD2
Philips Semiconductors
8-bit microcontrollers with 80C51 core
Contents
1
2
3
3.1
4
5
5.1
5.2
6
7
7.1
7.1.1
7.1.2
7.1.3
7.1.4
7.2
7.2.1
7.2.2
7.2.3
7.2.4
7.2.5
7.2.6
7.2.7
7.3
7.3.1
7.3.2
7.3.3
7.3.4
7.4
7.4.1
7.4.2
7.4.3
7.4.4
7.4.5
7.5
7.5.1
7.5.2
7.5.3
7.5.4
7.5.5
7.5.6
7.5.7
7.5.8
7.5.9
7.6
7.6.1
7.6.2
7.7
7.8
General description . . . . . . . . . . . . . . . . . . . . . . 1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Ordering information . . . . . . . . . . . . . . . . . . . . . 2
Ordering options . . . . . . . . . . . . . . . . . . . . . . . . 2
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pinning information . . . . . . . . . . . . . . . . . . . . . . 4
Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 7
Special function registers . . . . . . . . . . . . . . . . 10
Functional description . . . . . . . . . . . . . . . . . . 14
Memory organization . . . . . . . . . . . . . . . . . . . 14
Flash program memory. . . . . . . . . . . . . . . . . . 14
Data RAM memory . . . . . . . . . . . . . . . . . . . . . 14
Expanded data RAM addressing . . . . . . . . . . 14
Dual data pointers. . . . . . . . . . . . . . . . . . . . . . 17
Flash memory In-Application Programming . . 18
Flash organization . . . . . . . . . . . . . . . . . . . . . 18
Boot block . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Power-On reset code execution . . . . . . . . . . . 19
In-System Programming (ISP) . . . . . . . . . . . . 19
Using the In-System Programming. . . . . . . . . 19
Using the serial number . . . . . . . . . . . . . . . . . 23
In-Application Programming method . . . . . . . 23
Timers/counters 0 and 1 . . . . . . . . . . . . . . . . . 25
Mode 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Mode 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Mode 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Mode 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Timer 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Capture mode . . . . . . . . . . . . . . . . . . . . . . . . . 30
Auto-reload mode (up or down counter) . . . . . 31
Programmable clock-out . . . . . . . . . . . . . . . . . 32
Baud rate generator mode . . . . . . . . . . . . . . . 33
Summary of baud rate equations . . . . . . . . . . 34
UARTs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Mode 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Mode 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Mode 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Mode 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Framing error . . . . . . . . . . . . . . . . . . . . . . . . . 36
More about UART mode 1 . . . . . . . . . . . . . . . 36
More about UART modes 2 and 3 . . . . . . . . . 37
Multiprocessor communications . . . . . . . . . . . 37
Automatic address recognition . . . . . . . . . . . . 38
Serial peripheral interface. . . . . . . . . . . . . . . . 39
SPI features . . . . . . . . . . . . . . . . . . . . . . . . . . 39
SPI description . . . . . . . . . . . . . . . . . . . . . . . . 40
Watchdog timer. . . . . . . . . . . . . . . . . . . . . . . . 42
Programmable Counter Array (PCA) . . . . . . . 43
© Koninklijke Philips Electronics N.V. 2004.
Printed in the U.S.A.
All rights are reserved. Reproduction in whole or in part is prohibited without the prior
written consent of the copyright owner.
The information presented in this document does not form part of any quotation or
contract, is believed to be accurate and reliable and may be changed without notice. No
liability will be accepted by the publisher for any consequence of its use. Publication
thereof does not convey nor imply any license under patent- or other industrial or
intellectual property rights.
Date of release: 01 March 2004
Document order number: 9397 750 12964
7.8.1
7.8.2
7.8.3
7.8.4
7.8.5
7.9
7.10
7.10.1
7.10.2
7.10.3
7.10.4
7.11
7.11.1
7.11.2
7.12
7.12.1
PCA capture mode. . . . . . . . . . . . . . . . . . . . .
16-bit software timer mode. . . . . . . . . . . . . . .
High speed output mode . . . . . . . . . . . . . . . .
Pulse width modulator mode . . . . . . . . . . . . .
PCA Watchdog timer . . . . . . . . . . . . . . . . . . .
Security Bit . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power-on Reset . . . . . . . . . . . . . . . . . . . . . . .
Software reset . . . . . . . . . . . . . . . . . . . . . . . .
Brown-out detection reset . . . . . . . . . . . . . . .
Interrupt priority and polling sequence . . . . . .
Power-saving modes . . . . . . . . . . . . . . . . . . .
Idle mode . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power-down mode . . . . . . . . . . . . . . . . . . . . .
System clock and clock options . . . . . . . . . . .
Clock Input Options and
Recommended Capacitor Values for
Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.12.2
Clock doubling option . . . . . . . . . . . . . . . . . . .
8
Limiting values . . . . . . . . . . . . . . . . . . . . . . . .
9
Recommended operating conditions . . . . . .
10
Static characteristics . . . . . . . . . . . . . . . . . . .
11
Dynamic characteristics . . . . . . . . . . . . . . . . .
11.1
Explanation of symbols . . . . . . . . . . . . . . . . .
12
Package outline . . . . . . . . . . . . . . . . . . . . . . . .
13
Revision history . . . . . . . . . . . . . . . . . . . . . . .
14
Data sheet status. . . . . . . . . . . . . . . . . . . . . . .
15
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . .
16
Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . .
47
48
49
50
50
51
51
52
53
53
53
56
57
57
58
58
59
60
60
62
64
65
70
73
74
74
74