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P89C51X2 |
INTEGRATED CIRCUITS |
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P89C51X2/52X2/54X2/58X2
80C51 8-bit Flash microcontroller family
4K/8K/16K/32K Flash 128B/256B RAM
Preliminary data |
2002 Jun 05 |
Supersedes data of 2002 Feb 28 |
|
P s
on o s
Philips Semiconductors Preliminary data
80C51 8-bit Flash microcontroller family |
P89C51X2/52X2/54X2/58X2 |
|
4K/8K/16K/32K Flash |
||
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||
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DESCRIPTION
The Philips microcontrollers described in this data sheet are high-performance static 80C51 designs. They are manufactured in an advanced CMOS process and contain a non-volatile Flash program memory. They support both 12-clock and 6-clock operation.
The P89C51X2 and P89C52X2/54X2/58X2 contain 128 byte RAM and 256 byte RAM respectively, 32 I/O lines, three 16-bit counter/timers, a six-source, four-priority level nested interrupt structure, a serial I/O port for either multi-processor communications, I/O expansion or full duplex UART, and on-chip oscillator and clock circuits.
In addition, the devices are static designs which offer a wide range of operating frequencies down to zero. Two software selectable
modes of power reduction Ð idle mode and power-down mode Ð are available. The idle mode freezes the CPU while allowing the RAM, timers, serial port, and interrupt system to continue functioning. The power-down mode saves the RAM contents but freezes the oscillator, causing all other chip functions to be inoperative. Since the design is static, the clock can be stopped without loss of user data. Then the execution can be resumed from the point the clock was stopped.
SELECTION TABLE
For applications requiring more Flash and RAM, as well as more on-chip peripherals, see the P89C66x and P89C51Rx2 data sheets.
Type |
|
Memory |
|
|
Timers |
|
Serial Interfaces |
|
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ADCbits/ch. |
|
RAM |
ROM |
OTP |
Flash |
of# Timers |
PWM |
PCA |
WD |
UART |
I |
CAN |
SPI |
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C |
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2 |
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P89C58X2 |
256B |
± |
± |
32K |
3 |
± |
± |
± |
n |
± |
± |
± |
± |
P89C54X2 |
256B |
± |
± |
16K |
3 |
± |
± |
± |
n |
± |
± |
± |
± |
P89C52X2 |
256B |
± |
± |
8K |
3 |
± |
± |
± |
n |
± |
± |
± |
± |
P89C51X2 |
128B |
± |
± |
4K |
3 |
± |
± |
± |
n |
± |
± |
± |
± |
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NOTE:
|
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DefaultClock Rate |
Optional ClockRate |
Max. |
PinsI/O |
Interrupts (External) |
Program Security |
Freq. |
||
at 6-clk |
|||||
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/ 12-clk |
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(MHz) |
32 |
6 (2) |
n |
12±clk |
6-clk |
20/33 |
32 |
6 (2) |
n |
12±clk |
6-clk |
20/33 |
32 |
6 (2) |
n |
12±clk |
6-clk |
20/33 |
32 |
6 (2) |
n |
12±clk |
6-clk |
20/33 |
|
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Freq. Freq. Range Range at 3V at 5V (MHz) (MHz)
±0±20/33
±0±20/33
±0±20/33
±0±20/33
1.I2C = Inter-Integrated Circuit Bus; CAN = Controller Area Network; SPI = Serial Peripheral Interface; PCA = Programmable Counter Array;
ADC = Analog-to-Digital Converter; PWM = Pulse Width Modulation
DEVICE COMPARISON TABLE
Item |
P89C5xX2 devices (this data |
P89C5xBx devices (separate data |
P89C5xUxx devices |
|
sheet) |
sheet) |
(discontinued) |
|
|
|
|
Type Description |
P89C5xX2Bxx/P89C5xX2Fxx |
P89C5xBx |
P89C5xUBxx/P89C5xUFxx |
|
|
|
|
PROGRAMMING |
When using a parallel programmer, |
When using a parallel programmer, |
When using a parallel programmer, |
ALGORITHM |
be sure to select P89C5xX2 devices. |
be sure to select P89C5xBx devices. |
be sure to select P89C5xUxxx |
|
IF DEVICES ARE NOT YET |
IF DEVICES ARE NOT YET |
devices. |
|
SELECTABLE ASK YOUR |
SELECTABLE ASK YOUR |
|
|
PROGRAMMER VENDOR FOR A |
PROGRAMMER VENDOR FOR A |
|
|
SOFTWARE UPDATE |
SOFTWARE UPDATE |
|
|
|
|
|
Quad Flat Package |
LQFP package (P89C5xX2xBD) |
LQFP package (P89C5xBBD) |
PQFP package (P89C5xUxBB) |
type |
|
|
|
|
|
|
|
Package identifiers |
PLCC = A |
PLCC = A |
PLCC = AA |
|
LQFP = BD |
LQFP = BD |
LQFP = BB |
|
PDIP = N |
PDIP = P |
PDIP = PN |
|
|
|
|
Flash Memory program |
10,000 program and erase cycles |
10,000 program and erase cycles |
100 program and erase cycles |
and erase cycles |
|
|
|
2002 Jun 06 |
2 |
Philips Semiconductors Preliminary data
80C51 8-bit Flash microcontroller family |
P89C51X2/52X2/54X2/58X2 |
4K/8K/16K/32K Flash |
|
|
|
FEATURES
•80C51 Central Processing Unit
±4 Kbytes Flash (P89C51X2)
±8 Kbytes Flash (P89C52X2)
±16 Kbytes Flash (P89C54X2)
±32 Kbytes Flash (P89C58X2)
±128 byte RAM (P89C51X2)
±256 byte RAM (P89C52/54X2/58X2)
±Boolean processor
±Fully static operation
•12-clock operation with selectable 6-clock operation (via software or via parallel programmer)
•Memory addressing capability
± Up to 64 Kbytes ROM and 64 Kbytes RAM
•Power control modes:
±Clock can be stopped and resumed
±Idle mode
±Power-down mode
•Two speed ranges
±0 to 20 MHz with 6-clock operation
±0 to 33 MHz with 12-clock operation
•LQFP, PLCC or DIP package
•Extended temperature ranges
•Dual Data Pointers
•Three security bits
•Four interrupt priority levels
•Six interrupt sources
•Four 8-bit I/O ports
•Full-duplex enhanced UART
±Framing error detection
±Automatic address recognition
•Three 16-bit timers/counters T0, T1 (standard 80C51) and additional T2 (capture and compare)
•Programmable clock-out pin
•Asynchronous port reset
•Low EMI (inhibit ALE, slew rate controlled outputs, and 6-clock mode)
•Wake-up from Power Down by an external interrupt
2002 Jun 06 |
3 |
Philips Semiconductors Preliminary data
80C51 8-bit Flash microcontroller family |
P89C51X2/52X2/54X2/58X2 |
4K/8K/16K/32K Flash |
|
|
|
P89C51X2 ORDERING INFORMATION (4 KBYTE FLASH)
Type number |
Package |
|
|
Temperature |
|
|
|
|
Range (°C) |
|
Name |
Description |
Version |
|
|
|
|||
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|
|
P89C51X2BA |
PLCC44 |
plastic leaded chip carrier; 44 leads |
SOT187-2 |
0 to +70 |
|
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|
P89C51X2BN |
DIP40 |
plastic dual in-line package; 40 leads (600 mil) |
SOT129-1 |
0 to +70 |
|
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|
|
P89C51X2BBD |
LQFP44 |
plastic low profile quad flat package; 44 leads |
SOT389-1 |
0 to +70 |
|
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|
|
|
P89C51X2FA |
PLCC44 |
plastic leaded chip carrier; 44 leads |
SOT187-2 |
±40 to +85 |
P89C52X2 ORDERING INFORMATION (8 KBYTE FLASH)
Type number |
Package |
|
|
Temperature |
|
|
|
|
Range (°C) |
|
Name |
Description |
Version |
|
|
|
|||
|
|
|
|
|
P89C52X2BA |
PLCC44 |
plastic leaded chip carrier; 44 leads |
SOT187-2 |
0 to +70 |
|
|
|
|
|
P89C52X2BN |
DIP40 |
plastic dual in-line package; 40 leads (600 mil) |
SOT129-1 |
0 to +70 |
|
|
|
|
|
P89C52X2BBD |
LQFP44 |
plastic low profile quad flat package; 44 leads |
SOT389-1 |
0 to +70 |
|
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|
|
|
P89C52X2FA |
PLCC44 |
plastic leaded chip carrier; 44 leads |
SOT187-2 |
±40 to +85 |
|
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|
|
|
P89C52X2FN |
DIP40 |
plastic dual in-line package; 40 leads (600 mil) |
SOT129-1 |
±40 to +85 |
|
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|
|
|
P89C52X2FBD |
LQFP44 |
plastic low profile quad flat package; 44 leads |
SOT389-1 |
±40 to +85 |
|
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|
|
P89C54X2 ORDERING INFORMATION (16 KBYTE FLASH)
Type number |
Package |
|
|
Temperature |
|
|
|
|
Range (°C) |
|
Name |
Description |
Version |
|
|
|
|||
|
|
|
|
|
P89C54X2BA |
PLCC44 |
plastic lead chip carrier; 44 leads |
SOT187-2 |
0 to +70 |
|
|
|
|
|
P89C54X2BN |
DIP40 |
plastic dual in-line package; 40 leads (600 mil) |
SOT129-1 |
0 to +70 |
|
|
|
|
|
P89C54X2BBD |
LQFP44 |
plastic low profile quad flat package; 44 leads |
SOT389-1 |
0 to +70 |
|
|
|
|
|
P89C54X2FA |
PLCC44 |
plastic lead chip carrier; 44 leads |
SOT187-2 |
±40 to +85 |
P89C58X2 ORDERING INFORMATION (32 KBYTE FLASH)
Type number |
Package |
|
|
Temperature |
|
|
|
|
Range (°C) |
|
Name |
Description |
Version |
|
|
|
|||
|
|
|
|
|
P89C58X2BA |
PLCC44 |
plastic lead chip carrier; 44 leads |
SOT187-2 |
0 to +70 |
|
|
|
|
|
P89C58X2BN |
DIP40 |
plastic dual in-line package; 40 leads (600 mil) |
SOT129-1 |
0 to +70 |
|
|
|
|
|
P89C58X2BBD |
LQFP44 |
plastic low profile quad flat package; 44 leads |
SOT389-1 |
0 to +70 |
|
|
|
|
|
P89C58X2FA |
PLCC44 |
plastic lead chip carrier; 44 leads |
SOT187-2 |
±40 to +85 |
|
|
|
|
|
2002 Jun 06 |
4 |
Philips Semiconductors Preliminary data
80C51 8-bit Flash microcontroller family |
P89C51X2/52X2/54X2/58X2 |
4K/8K/16K/32K Flash |
|
|
|
PART NUMBER DERIVATION
Memory |
|
|
Temperature Range |
Package |
||||
|
|
|
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|
|||
|
P89C51X2 |
|
|
B = 0 °C TO +70 °C |
A = PLCC |
|||
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|
|
X2 = 6-clock |
F = ±40 °C TO +85 °C |
N = DIP |
|
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|||
|
9 = Flash |
|
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1 = 128 BYTES RAM |
|
BD = LQFP |
||
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4 KBYTES FLASH |
mode available |
|
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2 = 256 BYTES RAM |
|
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8 KBYTES FLASH |
|
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4 = 256 BYTES RAM |
|
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16 KBYTES FLASH |
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8 = 256 BYTES RAM |
|
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32 KBYTES FLASH |
|
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|
The following table illustrates the correlation between operating mode, power supply and maximum external clock frequency:
Operating Mode |
Power Supply |
Maximum Clock Frequency |
|
|
|
6-clock |
5 V ± 10% |
20 MHz |
|
|
|
12-clock |
5 V ± 10% |
33 MHz |
|
|
|
2002 Jun 06 |
5 |
Philips Semiconductors Preliminary data
80C51 8-bit Flash microcontroller family |
P89C51X2/52X2/54X2/58X2 |
4K/8K/16K/32K Flash |
|
|
|
BLOCK DIAGRAM 1
|
ACCELERATED 80C51 CPU |
|
(12-CLK MODE, 6-CLK MODE) |
|
0K / 4K / 8K / 16K / |
|
32 KBYTE |
|
CODE FLASH |
|
FULL-DUPLEX |
|
ENHANCED UART |
|
128 / 256 BYTE |
|
DATA RAM |
|
TIMER 0 |
|
TIMER 1 |
|
PORT 3 |
|
CONFIGURABLE I/Os |
|
TIMER 2 |
|
PORT 2 |
|
CONFIGURABLE I/Os |
|
PORT 1 |
|
CONFIGURABLE I/Os |
|
PORT 0 |
|
CONFIGURABLE I/Os |
CRYSTAL OR |
OSCILLATOR |
RESONATOR |
|
|
su01617 |
2002 Jun 06 |
6 |
Philips Semiconductors Preliminary data
80C51 8-bit Flash microcontroller family |
P89C51X2/52X2/54X2/58X2 |
4K/8K/16K/32K Flash |
|
|
|
BLOCK DIAGRAM 2 (CPU-ORIENTED)
|
|
|
|
P0.0±P0.7 |
P2.0±P2.7 |
|
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|
|
PORT 0 |
PORT 2 |
|
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|
DRIVERS |
DRIVERS |
|
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VCC |
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VSS |
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RAM ADDR |
RAM |
PORT 0 |
PORT 2 |
ROM/EPROM |
|
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|
REGISTER |
|
LATCH |
LATCH |
|
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8 |
|
B |
|
ACC |
|
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STACK |
|
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REGISTER |
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POINTER |
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||
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PROGRAM |
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TMP1 |
|
ADDRESS |
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TMP2 |
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REGISTER |
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ALU |
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BUFFER |
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SFRs |
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TIMERS |
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PC |
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PSW |
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INCRE- |
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MENTER |
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8 |
16 |
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PROGRAM |
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COUNTER |
PSEN |
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INSTRUCTION |
REGISTER |
|
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ALE/PROG |
TIMING |
|
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DPTR'S |
||
EA / VPP |
AND |
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MULTIPLE |
||
CONTROL |
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RST |
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||
|
PD |
|
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PORT 1 |
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PORT 3 |
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LATCH |
|
LATCH |
|
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OSCILLATOR |
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||
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PORT 1 |
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PORT 3 |
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DRIVERS |
|
DRIVERS |
|
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XTAL1 |
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XTAL2 |
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P1.0±P1.7 |
|
P3.0±P3.7 |
|
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SU00845 |
2002 Jun 06 |
|
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|
7 |
|
|
Philips Semiconductors Preliminary data
80C51 8-bit Flash microcontroller family |
P89C51X2/52X2/54X2/58X2 |
4K/8K/16K/32K Flash |
|
|
|
LOGIC SYMBOL
|
|
VCC |
VSS |
|
|
|
XTAL1 |
|
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0 |
ADDRESS AND |
|
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PORT |
DATA BUS |
|
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XTAL2 |
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T2 |
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1 |
T2EX |
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RST |
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PORT |
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EA/VPP |
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PSEN |
|
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FUNCTIONSSECONDARY |
ALE/PROG |
2PORT |
|
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RxD |
3PORT |
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||
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TxD |
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INT0 |
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INT1 |
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ADDRESS BUS |
|
T0 |
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T1 |
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WR |
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RD |
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SU00830 |
PLASTIC DUAL IN-LINE PACKAGE
PIN CONFIGURATIONS
|
T2/P1.0 |
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||
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1 |
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40 |
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VCC |
||||
T2EX/P1.1 |
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2 |
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39 |
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P0.0/AD0 |
|||||
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P1.2 |
3 |
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38 |
|
P0.1/AD1 |
||
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P1.3 |
4 |
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37 |
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P0.2/AD2 |
||
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P1.4 |
5 |
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36 |
|
P0.3/AD3 |
||
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P1.5 |
6 |
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35 |
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P0.4/AD4 |
||
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P1.6 |
7 |
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34 |
|
P0.5/AD5 |
||
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P1.7 |
8 |
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33 |
|
P0.6/AD6 |
||
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RST |
9 |
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32 |
|
P0.7/AD7 |
||
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DUAL |
|
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RxD/P3.0 |
10 |
|
31 |
|
EA/VPP |
|||||
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IN-LINE |
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||
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|||
|
TxD/P3.1 |
11 |
PACKAGE |
30 |
|
ALE |
|||||
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12 |
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29 |
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INT0/P3.2 |
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PSEN |
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13 |
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28 |
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P2.7/A15 |
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INT1/P3.3 |
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T0/P3.4 |
14 |
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27 |
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P2.6/A14 |
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T1/P3.5 |
15 |
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26 |
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P2.5/A13 |
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16 |
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25 |
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P2.4/A12 |
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WR/P3.6 |
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17 |
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24 |
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P2.3/A11 |
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RD/P3.7 |
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XTAL2 |
18 |
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23 |
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P2.2/A10 |
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XTAL1 |
19 |
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22 |
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P2.1/A9 |
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VSS |
20 |
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21 |
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P2.0/A8 |
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SU01063 |
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PLASTIC LEADED CHIP CARRIER PIN FUNCTIONS
6 |
1 |
40 |
7 |
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39 |
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PLCC |
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17 |
|
29 |
18 |
|
28 |
Pin |
Function |
Pin |
Function |
Pin |
Function |
||||||
1 |
NIC* |
16 |
P3.4/T0 |
31 |
P2.7/A15 |
||||||
2 |
P1.0/T2 |
17 |
P3.5/T1 |
32 |
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PSEN |
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3 |
P1.1/T2EX |
18 |
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33 |
ALE |
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P3.6/WR |
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4 |
P1.2 |
19 |
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34 |
NIC* |
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P3.7/RD |
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5 |
P1.3 |
20 |
XTAL2 |
35 |
EA/VPP |
||||||
6 |
P1.4 |
21 |
XTAL1 |
36 |
P0.7/AD7 |
||||||
7 |
P1.5 |
22 |
VSS |
37 |
P0.6/AD6 |
||||||
8 |
P1.6 |
23 |
NIC* |
38 |
P0.5/AD5 |
||||||
9 |
P1.7 |
24 |
P2.0/A8 |
39 |
P0.4/AD4 |
||||||
10 |
RST |
25 |
P2.1/A9 |
40 |
P0.3/AD3 |
||||||
11 |
P3.0/RxD |
26 |
P2.2/A10 |
41 |
P0.2/AD2 |
||||||
12 |
NIC* |
27 |
P2.3/A11 |
42 |
P0.1/AD1 |
||||||
13 |
P3.1/TxD |
28 |
P2.4/A12 |
43 |
P0.0/AD0 |
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14 |
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29 |
P2.5/A13 |
44 |
VCC |
||||
P3.2/INT0 |
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15 |
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30 |
P2.6/A14 |
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P3.3/INT1 |
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* NO INTERNAL CONNECTION |
SU01062 |
|
LOW PROFILE QUAD FLAT PACK
PIN FUNCTIONS
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44 |
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34 |
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1 |
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33 |
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LQFP |
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11 |
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23 |
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12 |
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22 |
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Pin |
Function |
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Pin |
Function |
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Pin |
Function |
|||||||||
1 |
P1.5 |
16 |
VSS |
31 |
P0.6/AD6 |
|||||||||||||||
2 |
P1.6 |
17 |
NIC* |
32 |
P0.5/AD5 |
|||||||||||||||
3 |
P1.7 |
18 |
P2.0/A8 |
33 |
P0.4/AD4 |
|||||||||||||||
4 |
RST |
19 |
P2.1/A9 |
34 |
P0.3/AD3 |
|||||||||||||||
5 |
P3.0/RxD |
20 |
P2.2/A10 |
35 |
P0.2/AD2 |
|||||||||||||||
6 |
NIC* |
21 |
P2.3/A11 |
36 |
P0.1/AD1 |
|||||||||||||||
7 |
P3.1/TxD |
22 |
P2.4/A12 |
37 |
P0.0/AD0 |
|||||||||||||||
8 |
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23 |
P2.5/A13 |
38 |
VCC |
|||||||||||
P3.2/INT0 |
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|||||||||||||||||||
9 |
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24 |
P2.6/A14 |
39 |
NIC* |
|||||||||||
P3.3/INT1 |
|
|||||||||||||||||||
10 |
P3.4/T0 |
25 |
P2.7/A15 |
40 |
P1.0/T2 |
|||||||||||||||
11 |
P3.5/T1 |
26 |
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|
41 |
P1.1/T2EX |
|||||||||||||
PSEN |
||||||||||||||||||||
12 |
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27 |
ALE |
42 |
P1.2 |
||||||||||||
P3.6/WR |
|
|||||||||||||||||||
13 |
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28 |
NIC* |
43 |
P1.3 |
|||||||||||||
P3.7/RD |
|
|||||||||||||||||||
14 |
XTAL2 |
29 |
|
|
44 |
P1.4 |
||||||||||||||
EA/VPP |
||||||||||||||||||||
15 |
XTAL1 |
30 |
P0.7/AD7 |
|
|
|
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|
|
* NO INTERNAL CONNECTION |
SU01487 |
2002 Jun 06 |
8 |
Philips Semiconductors Preliminary data
80C51 8-bit Flash microcontroller family |
P89C51X2/52X2/54X2/58X2 |
4K/8K/16K/32K Flash |
|
|
|
PIN DESCRIPTIONS
|
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PIN NUMBER |
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MNEMONIC |
DIP |
PLCC |
LQFP |
TYPE |
NAME AND FUNCTION |
|||||||||||||||||||||||
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VSS |
20 |
22 |
16 |
I |
Ground: 0 V reference. |
|||||||||||||||||||||||
|
VCC |
40 |
44 |
38 |
I |
Power Supply: This is the power supply voltage for normal, idle, and power-down operation. |
|||||||||||||||||||||||
|
P0.0-0.7 |
39±32 |
43±36 |
37±30 |
I/O |
Port 0: Port 0 is an open-drain, bidirectional I/O port. Port 0 pins that have 1s written to |
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them float and can be used as high-impedance inputs. Port 0 is also the multiplexed |
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low-order address and data bus during accesses to external program and data memory. In |
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this application, it uses strong internal pull-ups when emitting 1s. Port 0 also outputs the |
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code bytes during program verification and received code bytes during Flash programming. |
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External pull-ups are required during program verification. |
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P1.0±P1.7 |
1±8 |
2±9 |
40±44, |
I/O |
Port 1: Port 1 is an 8-bit bidirectional I/O port with internal pull-ups. Port 1 pins that have 1s |
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1±3 |
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written to them are pulled high by the internal pull-ups and can be used as inputs. As inputs, |
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port 1 pins that are externally pulled low will source current because of the internal pull-ups. |
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(See DC Electrical Characteristics: IIL). Port 1 also receives the low-order address byte |
|||||||||||||||||||
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during program memory verification. Alternate functions for Port 1 include: |
|||||||||||||||||||
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1 |
2 |
40 |
I/O |
|
T2 (P1.0): Timer/Counter 2 external count input/clockout (see Programmable Clock-Out) |
||||||||||||||||||
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2 |
3 |
41 |
I |
|
T2EX (P1.1): Timer/Counter 2 Reload/Capture/Direction control |
||||||||||||||||||
|
P2.0±P2.7 |
21±28 |
24±31 |
18±25 |
I/O |
Port 2: Port 2 is an 8-bit bidirectional I/O port with internal pull-ups. Port 2 pins that have 1s |
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written to them are pulled high by the internal pull-ups and can be used as inputs. As inputs, |
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port 2 pins that are externally being pulled low will source current because of the internal |
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pull-ups. (See DC Electrical Characteristics: IIL). Port 2 emits the high-order address byte |
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during fetches from external program memory and during accesses to external data memory |
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that use 16-bit addresses (MOVX @DPTR). In this application, it uses strong internal |
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pull-ups when emitting 1s. During accesses to external data memory that use 8-bit addresses |
|||||||||||||||||||
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(MOV @Ri), port 2 emits the contents of the P2 special function register. Some Port 2 pins |
|||||||||||||||||||
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|
|
receive the high order address bits during Flash programming and verification. |
|||||||||||||||||||
|
P3.0±P3.7 |
10±17 |
11, |
5, |
I/O |
Port 3: Port 3 is an 8-bit bidirectional I/O port with internal pull-ups. Port 3 pins that have 1s |
|||||||||||||||||||||||
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13±19 |
7±13 |
|
written to them are pulled high by the internal pull-ups and can be used as inputs. As inputs, |
|||||||||||||||||||
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port 3 pins that are externally being pulled low will source current because of the pull-ups. |
|||||||||||||||||||
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(See DC Electrical Characteristics: IIL). Port 3 also serves the special features of the 80C51 |
|||||||||||||||||||
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|
|
family, as listed below: |
|||||||||||||||||||
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10 |
11 |
5 |
I |
|
RxD (P3.0): Serial input port |
||||||||||||||||||
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11 |
13 |
7 |
O |
|
TxD (P3.1): Serial output port |
||||||||||||||||||
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12 |
14 |
8 |
I |
|
|
|
|
|
(P3.2): External interrupt |
||||||||||||||
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INT0 |
||||||||||||||||||||||
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13 |
15 |
9 |
I |
|
|
|
|
(P3.3): External interrupt |
|||||||||||||||
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INT1 |
||||||||||||||||||||||
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14 |
16 |
10 |
I |
|
T0 (P3.4): Timer 0 external input |
||||||||||||||||||
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15 |
17 |
11 |
I |
|
T1 (P3.5): Timer 1 external input |
||||||||||||||||||
|
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16 |
18 |
12 |
O |
|
|
|
(P3.6): External data memory write strobe |
||||||||||||||||
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WR |
||||||||||||||||||||||
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17 |
19 |
13 |
O |
|
|
(P3.7): External data memory read strobe |
|||||||||||||||||
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RD |
||||||||||||||||||||||
|
RST |
9 |
10 |
4 |
I |
Reset: A high on this pin for two machine cycles while the oscillator is running, resets the |
|||||||||||||||||||||||
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|
device. An internal diffused resistor to VSS permits a power-on reset using only an external |
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|
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capacitor to VCC. |
|||||||||||||||||||
|
ALE/PROG |
|
30 |
33 |
27 |
O |
Address Latch Enable/Program Pulse: Output pulse for latching the low byte of the |
||||||||||||||||||||||
|
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|
|
address during an access to external memory. In normal operation, ALE is emitted at a |
|||||||||||||||||||
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|
|
constant rate of 1/6 (12-clk) or 1/3 (6-clk Mode) the oscillator frequency, and can be used for |
|||||||||||||||||||
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|
|
external timing or clocking. Note that one ALE pulse is skipped during each access to |
|||||||||||||||||||
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|
|
external data memory. This pin is also the program pulse input |
(PROG) |
during Flash |
|||||||||||||||||
|
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|
|
programming. ALE can be disabled by setting SFR auxiliary.0. With this bit set, ALE will be |
|||||||||||||||||||
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|
|
active only during a MOVX instruction. |
|||||||||||||||||||
|
|
|
|
29 |
32 |
26 |
O |
Program Store Enable: The read strobe to external program memory. When the device is |
|||||||||||||||||||||
|
PSEN |
||||||||||||||||||||||||||||
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|
|
executing code from the external program memory, |
PSEN |
is activated twice each machine |
|||||||||||||||||
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|
|
cycle, except that two |
PSEN |
activations are skipped during each access to external data |
|||||||||||||||||
|
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|
|
memory. |
PSEN |
is not activated during fetches from internal program memory. |
|||||||||||||||||
|
|
|
31 |
35 |
29 |
I |
External Access Enable/Programming Supply Voltage: |
|
must be externally held low to enable the device |
||||||||||||||||||||
|
EA/VPP |
EA |
|||||||||||||||||||||||||||
|
|
|
|
|
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|
|
|
to fetch code from external program memory locations 0000H to 0FFFH/1FFFH/3FFFH/7FFFH. If |
EA |
is held |
|||||||||||||||||
|
|
|
|
|
|
|
|
|
|
high, the device executes from internal program memory unless the program counter contains an address |
|||||||||||||||||||
|
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|
|
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|
|
greater than the on-chip Flash. This pin also receives the 5 V / 12 V programming supply voltage (VPP) during |
|||||||||||||||||||
|
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|
|
|
|
|
|
|
|
Flash programming. If security bit 1 is programmed, |
EA |
will be internally latched on Reset. |
|||||||||||||||||
|
XTAL1 |
19 |
21 |
15 |
I |
Crystal 1: Input to the inverting oscillator amplifier and input to the internal clock generator |
|||||||||||||||||||||||
|
|
|
|
|
|
|
|
|
|
circuits. |
|||||||||||||||||||
|
XTAL2 |
18 |
20 |
14 |
O |
Crystal 2: Output from the inverting oscillator amplifier. |
NOTE: |
+ 0.5 V or V |
|
± 0.5 V, respectively. |
To avoid ªlatch-upº effect at power-on, the voltage on any pin at any time must not be higher than V |
SS |
||
CC |
|
2002 Jun 06 |
9 |
Philips Semiconductors Preliminary data
80C51 8-bit Flash microcontroller family |
P89C51X2/52X2/54X2/58X2 |
4K/8K/16K/32K Flash |
|
|
|
Table 1. |
Special Function Registers |
|
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|
||
SYMBOL |
DESCRIPTION |
DIRECT |
|
|
|
|
|
BIT ADDRESS, SYMBOL, OR ALTERNATIVE PORT FUNCTION |
RESET |
|||||||||||||||||||||
ADDRESS |
|
MSB |
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LSB |
VALUE |
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||||||||||
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ACC* |
Accumulator |
E0H |
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E7 |
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E6 |
E5 |
E4 |
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E3 |
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E2 |
E1 |
E0 |
00H |
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AUXR# |
Auxiliary |
8EH |
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xxxxxxx0B |
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± |
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± |
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± |
± |
± |
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± |
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± |
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AO |
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AUXR1# |
Auxiliary 1 |
A2H |
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xxx000x0B |
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± |
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± |
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± |
± |
WUPD |
0 |
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± |
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DPS |
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B* |
B register |
F0H |
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00H |
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F7 |
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F6 |
F5 |
F4 |
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F3 |
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F2 |
F1 |
F0 |
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CKCON |
Clock Control Register |
8FH |
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xxx00000B |
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± |
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± |
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± |
± |
± |
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± |
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± |
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X2 |
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DPTR: |
Data Pointer (2 bytes) |
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DPH |
Data Pointer High |
83H |
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00H |
DPL |
Data Pointer Low |
82H |
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00H |
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AF |
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AE |
AD |
AC |
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AB |
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AA |
A9 |
A8 |
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IE* |
Interrupt Enable |
A8H |
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0x000000B |
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EA |
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± |
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ET2 |
ES |
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ET1 |
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EX1 |
ET0 |
EX0 |
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BF |
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BE |
BD |
BC |
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BB |
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BA |
B9 |
B8 |
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IP* |
Interrupt Priority |
B8H |
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xx000000B |
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± |
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± |
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PT2 |
PS |
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PT1 |
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PX1 |
PT0 |
PX0 |
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IPH# |
Interrupt Priority High |
B7H |
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xx000000B |
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± |
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± |
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PT2H |
PSH |
PT1H |
PX1H |
PT0H |
PX0H |
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87 |
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86 |
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85 |
84 |
83 |
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82 |
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81 |
80 |
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P0* |
Port 0 |
80H |
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FFH |
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AD7 |
AD6 |
AD5 |
AD4 |
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AD3 |
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AD2 |
AD1 |
AD0 |
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97 |
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96 |
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95 |
94 |
93 |
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92 |
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91 |
90 |
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P1* |
Port 1 |
90H |
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FFH |
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± |
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± |
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± |
± |
± |
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± |
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T2EX |
T2 |
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A7 |
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A6 |
A5 |
A4 |
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A3 |
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A2 |
A1 |
A0 |
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P2* |
Port 2 |
A0H |
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FFH |
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AD15 |
AD14 |
AD13 |
AD12 |
AD11 |
AD10 |
AD9 |
AD8 |
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B7 |
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B6 |
B5 |
B4 |
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B3 |
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B2 |
B1 |
B0 |
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P3* |
Port 3 |
B0H |
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FFH |
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RD |
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WR |
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T1 |
T0 |
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INT1 |
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INT0 |
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TxD |
RxD |
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PCON#1 |
Power Control |
87H |
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00xx0000B |
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SMOD1 |
SMOD0 |
± |
POF |
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GF1 |
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GF0 |
PD |
IDL |
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D7 |
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D6 |
D5 |
D4 |
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D3 |
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D2 |
D1 |
D0 |
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PSW* |
Program Status Word |
D0H |
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000000x0B |
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CY |
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AC |
F0 |
RS1 |
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RS0 |
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OV |
± |
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P |
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RACAP2H# |
Timer 2 Capture High |
CBH |
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00H |
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RACAP2L# |
Timer 2 Capture Low |
CAH |
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00H |
SADDR# |
Slave Address |
A9H |
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00H |
SADEN# |
Slave Address Mask |
B9H |
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00H |
SBUF |
Serial Data Buffer |
99H |
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xxxxxxxxB |
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9F |
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9E |
9D |
9C |
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9B |
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9A |
99 |
98 |
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SCON* |
Serial Control |
98H |
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00H |
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SM0/FE |
SM1 |
SM2 |
REN |
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TB8 |
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RB8 |
TI |
RI |
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SP |
Stack Pointer |
81H |
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07H |
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8F |
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8E |
8D |
8C |
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8B |
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8A |
89 |
88 |
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TCON* |
Timer Control |
88H |
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00H |
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TF1 |
TR1 |
TF0 |
TR0 |
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IE1 |
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IT1 |
IE0 |
IT0 |
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CF |
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CE |
CD |
CC |
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CB |
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CA |
C9 |
C8 |
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T2CON* |
Timer 2 Control |
C8H |
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TF2 |
EXF2 |
RCLK |
TCLK |
EXEN2 |
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TR2 |
C/T2 |
CP/RL2 |
00H |
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T2MOD# |
Timer 2 Mode Control |
C9H |
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± |
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± |
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± |
± |
± |
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± |
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T2OE |
DCEN |
xxxxxx00B |
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TH0 |
Timer High 0 |
8CH |
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00H |
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TH1 |
Timer High 1 |
8DH |
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00H |
TH2# |
Timer High 2 |
CDH |
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00H |
TL0 |
Timer Low 0 |
8AH |
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00H |
TL1 |
Timer Low 1 |
8BH |
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00H |
TL2# |
Timer Low 2 |
CCH |
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00H |
TMOD |
Timer Mode |
89H |
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GATE |
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C/T |
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M1 |
M0 |
GATE |
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C/T |
M1 |
M0 |
00H |
NOTE:
Unused register bits that are not defined should not be set by the user's program. If violated, the device could function incorrectly.
*SFRs are bit addressable.
# SFRs are modified from or added to the 80C51 SFRs.
± Reserved bits.
1. Reset value depends on reset source.
2002 Jun 06 |
10 |
Philips Semiconductors Preliminary data
80C51 8-bit Flash microcontroller family |
P89C51X2/52X2/54X2/58X2 |
4K/8K/16K/32K Flash |
|
|
|
FLASH EPROM MEMORY
General Description
The P89C51X2/P89C52X2/P89C54X2/P89C58X2 FLASH reliably stores memory contents even after 10,000 erase and program cycles. The cell is designed to optimize the erase and programming mechanisms. In addition, the combination of advanced tunnel oxide processing and low internal electric fields for erase and programming operations produces reliable cycling.
Features
•FLASH EPROM internal program memory with Chip Erase
•Up to 64 kbyte external program memory if the internal program memory is disabled (EA = 0)
•Programmable security bits
•10,000 minimum erase/program cycles for each byte
•10 year minimum data retention
•Programming support available from many popular vendors
OSCILLATOR CHARACTERISTICS
Using the oscillator, XTAL1 and XTAL2 are the input and output, respectively, of an inverting amplifier. The pins can be configured for use as an on-chip oscillator, as shown in the logic symbol.
To drive the device from an external clock source, XTAL1 should be driven while XTAL2 is left unconnected. However, minimum and maximum high and low times specified in the data sheet must be observed.
Clock Control Register (CKCON)
This device provides control of the 6-clock/12-clock mode by both an SFR bit (bit X2 in register CKCON) and a Flash bit (bit FX2, located in the Security Block). When X2 is 0, 12-clock mode is activated. By setting this bit to 1, the system is switching to 6-clock mode. Having this option implemented as SFR bit, it can be accessed anytime and changed to either value. Changing X2 from 0 to 1 will result in executing user code at twice the speed, since all system time intervals will be divided by 2. Changing back from 6-clock to 12-clock mode will slow down running code by a factor of
2.
The Flash clock control bit (FX2) activates the 6-clock mode when programmed using a parallel programmer, superceding the X2 bit (CKCON.0). Please also see Table 2 below.
Table 2.
FX2 clock mode bit |
X2 bit |
CPU clock mode |
(can only be set by |
(CKCON.0) |
|
parallel programmer) |
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erased |
0 |
12-clock mode |
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(default) |
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erased |
1 |
6-clock mode |
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programmed |
X |
6-clock mode |
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Programmable Clock-Out Pin
A 50% duty cycle clock can be programmed to be output on P1.0. This pin, besides being a regular I/O pin, has two alternate 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 61 Hz to 4 MHz at a 16 MHz operating frequency in 12-clock mode (122 Hz to
8 MHz in 6-clock mode).
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 this equation:
Oscillator Frequency
n (65536±RCAP2H, RCAP2L)
Where:
n = 2 in 6-clock mode, 4 in 12-clock mode.
(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. It is possible to use Timer 2 as a baud-rate generator and a clock generator simultaneously. Note, however, that the baud-rate and the
Clock-Out frequency will be the same.
RESET
A reset is accomplished by holding the RST pin HIGH for at least two machine cycles (24 oscillator periods in 12-clock and 12 oscillator periods in 6-clock mode), while the oscillator is running. To insure a reliable power-up reset, the RST pin must be high long enough to allow the oscillator time to start up (normally a few milliseconds) plus two machine cycles, unless it has been set to
6-clock operation using a parallel programmer.
LOW POWER MODES
Stop Clock Mode
The static design enables the clock speed to be reduced down to
0 MHz (stopped). When the oscillator is stopped, the RAM and Special Function Registers retain their values. This mode allows step-by-step utilization and permits reduced system power consumption by lowering the clock frequency down to any value. For lowest power consumption the Power Down mode is suggested.
Idle Mode
In idle mode (see Table 3), the CPU puts itself to sleep while all of the on-chip peripherals stay active. The instruction to invoke the idle mode is the last instruction executed in the normal operating mode before the idle mode is activated. The CPU contents, the on-chip RAM, and all of the special function registers remain intact during this mode. The idle mode can be terminated either by any enabled interrupt (at which time the process is picked up at the interrupt service routine and continued), or by a hardware reset which starts the processor in the same manner as a power-on reset.
2002 Jun 06 |
11 |
Philips Semiconductors Preliminary data
80C51 8-bit Flash microcontroller family |
P89C51X2/52X2/54X2/58X2 |
4K/8K/16K/32K Flash |
|
|
|
Power-Down Mode
To save even more power, a Power Down mode (see Table 3) can be invoked by software. In this mode, the oscillator is stopped and the instruction that invoked Power Down is the last instruction executed. The on-chip RAM and Special Function Registers retain their values down to 2.0 V and care must be taken to return VCC to the minimum specified operating voltages before the Power Down Mode is terminated.
Either a hardware reset or external interrupt can be used to exit from Power Down. Reset redefines all the SFRs but does not change the on-chip RAM. An external interrupt allows both the SFRs and the on-chip RAM to retain their values. WUPD (AUXR1.3±Wakeup from Power Down) enables or disables the wakeup from power down with external interrupt. Where:
WUPD = 0: Disable
WUPD = 1: Enable
To properly terminate Power Down, the reset or external interrupt should not be executed before VCC is restored to its normal operating level and must be held active long enough for the oscillator to restart and stabilize (normally less than 10 ms).
To terminate Power Down with an external interrupt, INT0 or INT1 must be enabled and configured as level-sensitive. Holding the pin low restarts the oscillator but bringing the pin back high completes the exit. Once the interrupt is serviced, the next instruction to be
executed after RETI will be the one following the instruction that put the device into Power Down.
Design Consideration
When the idle mode is terminated by a hardware reset, the device normally resumes program execution from where it left off, up to two machine cycles before the internal reset algorithm takes control. On-chip hardware inhibits access to internal RAM in this event, but access to the port pins is not inhibited. To eliminate the possibility of an unexpected write when Idle is terminated by reset, the instruction following the one that invokes Idle should not be one that writes to a port pin or to external memory.
ONCE Mode
The ONCE (ªOn-Circuit Emulationº) Mode facilitates testing and debugging of systems without the device having to be removed from the circuit. The ONCE Mode is invoked in the following way:
1.Pull ALE low while the device is in reset and PSEN is high;
2.Hold ALE low as RST is deactivated.
While the device is in ONCE Mode, the Port 0 pins go into a float state, and the other port pins and ALE and PSEN are weakly pulled high. The oscillator circuit remains active. While the device is in this mode, an emulator or test CPU can be used to drive the circuit. Normal operation is restored when a normal reset is applied.
Table 3. External Pin Status During Idle and Power-Down Modes
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MODE |
PROGRAM MEMORY |
ALE |
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PSEN |
PORT 0 |
PORT 1 |
PORT 2 |
PORT 3 |
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Idle |
Internal |
1 |
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1 |
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Data |
Data |
Data |
Data |
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Idle |
External |
1 |
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1 |
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Float |
Data |
Address |
Data |
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Power-down |
Internal |
0 |
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0 |
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Data |
Data |
Data |
Data |
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Power-down |
External |
0 |
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0 |
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Float |
Data |
Data |
Data |
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TIMER 0 AND TIMER 1 OPERATION
Timer 0 and Timer 1
The ªTimerº or ªCounterº function is selected by control bits C/Tin 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.
Mode 0
Putting either Timer into Mode 0 makes it look like an 8048 Timer, which is an 8-bit Counter with a divide-by-32 prescaler. Figure 2 shows the Mode 0 operation.
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 counted 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 3).
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 as for Timer 1. There are two different GATE bits, one for Timer 1 (TMOD.7) and one for Timer 0 (TMOD.3).
Mode 1
Mode 1 is the same as Mode 0, except that the Timer register is being run with all 16 bits.
Mode 2
Mode 2 configures the Timer register as an 8-bit Counter (TLn) with automatic reload, as shown in Figure 4. Overflow from TLn not only sets TFn, but also reloads TLn with the contents of THn, which is preset by software. The reload leaves THn unchanged.
Mode 2 operation is the same for Timer 0 as for Timer 1.
Mode 3
Timer 1 in Mode 3 simply holds its count. The effect is the same as setting TR1 = 0.
Timer 0 in Mode 3 establishes TL0 and TH0 as two separate counters. The logic for Mode 3 on Timer 0 is shown in Figure 5. TL0 uses the Timer 0 control bits: C/T, GATE, TR0, and TF0 as well as pin INT0. 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 ªTimer 1º interrupt.
2002 Jun 06 |
12 |
Philips Semiconductors Preliminary data
80C51 8-bit Flash microcontroller family |
P89C51X2/52X2/54X2/58X2 |
4K/8K/16K/32K Flash |
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Mode 3 is provided for applications requiring an extra 8-bit timer on |
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turned on and off by switching it out of and into its own Mode 3, or |
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the counter. With Timer 0 in Mode 3, an 80C51 can look like it has |
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can still be used by the serial port as a baud rate generator, or in |
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three Timer/Counters. When Timer 0 is in Mode 3, Timer 1 can be |
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fact, in any application not requiring an interrupt. |
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TMOD |
Address = 89H |
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Reset Value = 00H |
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Not Bit Addressable |
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7 |
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6 |
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5 |
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4 |
3 |
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2 |
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1 |
0 |
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GATE |
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C/T |
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M1 |
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M0 |
GATE |
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C/T |
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M1 |
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M0 |
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TIMER 1 |
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TIMER 0 |
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BIT |
SYMBOL |
FUNCTION |
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TMOD.3/ |
GATE |
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Gating control when set. Timer/Counter ªnº is enabled only while |
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pin is high and |
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ªINTnº |
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TMOD.7 |
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ªTRnº control pin is set. when cleared Timer ªnº is enabled whenever ªTRnº control bit is set. |
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TMOD.2/ |
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Timer or Counter Selector cleared for Timer operation (input from internal system clock.) |
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C/T |
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TMOD.6 |
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Set for Counter operation (input from ªTnº input pin). |
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M1 |
M0 |
OPERATING |
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0 |
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0 |
8048 Timer: ªTLnº serves as 5-bit prescaler. |
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01 16-bit Timer/Counter: ªTHnº and ªTLnº are cascaded; there is no prescaler.
10 8-bit auto-reload Timer/Counter: ªTHnº holds a value which is to be reloaded into ªTLnº each time it overflows.
11 (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 |
(Timer 1) Timer/Counter 1 stopped. |
SU01580
Figure 1. Timer/Counter 0/1 Mode Control (TMOD) Register
OSC |
d* |
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C/T = 0 |
TLn |
THn |
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TFn |
Interrupt |
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(5 Bits) |
(8 Bits) |
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C/T = 1 |
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Tn Pin |
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Control |
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TRn |
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Timer n |
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Gate bit |
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INTn Pin |
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*d = 6 in 6-clock mode; d = 12 in 12-clock mode. |
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SU01618 |
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Figure 2. |
Timer/Counter 0/1 Mode 0: 13-Bit Timer/Counter |
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2002 Jun 06 |
13 |
Philips Semiconductors Preliminary data
80C51 8-bit Flash microcontroller family |
P89C51X2/52X2/54X2/58X2 |
4K/8K/16K/32K Flash |
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TCON |
Address = 88H |
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Reset Value = 00H |
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Bit Addressable |
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7 |
6 |
5 |
4 |
3 |
2 |
1 |
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0 |
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TF1 |
TR1 |
TF0 |
TR0 |
IE1 |
IT1 |
IE0 |
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IT0 |
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BIT |
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SYMBOL |
FUNCTION |
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TCON.7 |
TF1 |
Timer 1 overflow flag. Set by hardware on Timer/Counter overflow. |
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Cleared by hardware when processor vectors to interrupt routine, or clearing the bit in software. |
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TCON.6 |
TR1 |
Timer 1 Run control bit. Set/cleared by software to turn Timer/Counter on/off. |
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TCON.5 |
TF0 |
Timer 0 overflow flag. Set by hardware on Timer/Counter overflow. |
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Cleared by hardware when processor vectors to interrupt routine, or by clearing the bit in software. |
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TCON.4 |
TR0 |
Timer 0 Run control bit. Set/cleared by software to turn Timer/Counter on/off. |
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TCON.3 |
IE1 |
Interrupt 1 Edge flag. Set by hardware when external interrupt edge detected. |
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Cleared when interrupt processed. |
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TCON.2 |
IT1 |
Interrupt 1 type control bit. Set/cleared by software to specify falling edge/low level triggered |
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external interrupts. |
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TCON.1 |
IE0 |
Interrupt 0 Edge flag. Set by hardware when external interrupt edge detected. |
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Cleared when interrupt processed. |
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TCON.0 |
IT0 |
Interrupt 0 Type control bit. Set/cleared by software to specify falling edge/low level |
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triggered external interrupts. |
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SU01516 |
Figure 3. Timer/Counter 0/1 Control (TCON) Register
OSC |
d* |
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C/T = 0 |
TLn |
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TFn |
Interrupt |
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(8 Bits) |
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C/T = 1 |
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Tn Pin |
Control |
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TRn |
Reload |
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Timer n |
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Gate bit |
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THn |
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INTn Pin |
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(8 Bits) |
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*d = 6 in 6-clock mode; d = 12 in 12-clock mode. |
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SU01619 |
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Figure 4. |
Timer/Counter 0/1 Mode 2: 8-Bit Auto-Reload |
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2002 Jun 06 |
14 |
Philips Semiconductors Preliminary data
80C51 8-bit Flash microcontroller family |
P89C51X2/52X2/54X2/58X2 |
4K/8K/16K/32K Flash |
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OSC |
d* |
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C/T = 0 |
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TL0 |
TF0 |
Interrupt |
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(8 Bits) |
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C/T = 1 |
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T0 Pin |
Control |
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TR0 |
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Timer 0 |
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Gate bit |
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INT0 Pin |
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d* |
TH0 |
TF1 |
Interrupt |
OSC |
(8 Bits) |
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Control |
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TR1 |
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*d = 6 in 6-clock mode; d = 12 in 12-clock mode. |
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SU01620 |
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Figure 5. |
Timer/Counter 0 Mode 3: Two 8-Bit Counters |
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TIMER 2 OPERATION
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 (see Figure 6). Timer 2 has three operating modes: Capture, Auto-reload (up or down counting), and Baud Rate
Generator, which are selected by bits in the T2CON as shown in Table 4.
Capture Mode
In the capture mode there are two options which are selected by bit EXEN2 in T2CON. If EXEN2=0, then 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. This bit can be used to generate an interrupt (by enabling the Timer 2 interrupt bit in the
IE 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). The capture mode is illustrated in
Figure 7 (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 T2EX pin transitions or osc/12 (12-clock Mode) or osc/6 (6-clock Mode) pulses).
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 (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 Figure 8). After reset, DCEN=0 which means Timer 2 will default to counting up. If DCEN is set, Timer 2 can count up or down depending on the value of the T2EX pin.
Figure 9 shows Timer 2 which will count up automatically since 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.
If EXEN2=1, then 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 are 1.
In Figure 10 DCEN=1 which enables Timer 2 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.
A logic 0 applied to pin T2EX causes Timer 2 to count down. The timer will underflow when TL2 and TH2 become equal to the value stored in RCAP2L and RCAP2H. A 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. The EXF2 flag does not generate an interrupt in this mode of operation.
2002 Jun 06 |
15 |