P87LPC762FN NXP Semiconductors, P87LPC762FN Datasheet - Page 11

• Manufacturer Part Number: P87LPC762FN
• Description: MCU 8-Bit 87LP 80C51 CISC 2KB EPROM 5V 20-Pin PDIP Tube
• Manufacturer: NXP Semiconductors

Specifications of P87LPC762FN

• Package: 20PDIP
• Device Core: 80C51
• Family Name: 87LP
• Maximum Speed: 20 MHz
• Ram Size: 128 Byte
• Program Memory Size: 2 KB
• Operating Supply Voltage: 5 V
• Data Bus Width: 8 Bit
• Program Memory Type: EPROM
• Number Of Programmable I/os: 18
• Interface Type: I2C/UART
• Operating Temperature: -45 to 85 °C
• Number Of Timers: 2

* SFRs are bit addressable.
# SFRs are modified from or added to the 80C51 SFRs.
1. Unimplemented bits in SFRs are X (unknown) at all times. Ones should not be written to these bits since they may be used for other
2. I/O port values at reset are determined by the PRHI bit in the UCFG1 configuration byte.
3. The PCON reset value is x x BOF POF–0 0 0 0b. The BOF and POF flags are not affected by reset. The POF flag is set by hardware upon
4. The WDCON reset value is xx11 0000b for a Watchdog reset, xx01 0000b for all other reset causes if the watchdog is enabled, and xx00
Philips Semiconductors
NOTES:
2001 Oct 26
TL1
TMOD
WDCON#
WDRST#
Low power, low price, low pin count (20 pin)
microcontroller with 2 kbyte OTP
purposes in future derivatives. The reset value shown in the table for these bits is 0.
power up. The BOF flag is set by the occurrence of a brownout reset/interrupt and upon power up.
0000b for all other reset causes if the watchdog is disabled.
Name
Timer 1 low byte
Timer 0 and 1 mode
Watchdog control register
Watchdog reset register
Description
Address
SFR
8Bh
A7h
A6h
89h
GATE
–
MSB
C/T
–
8
WDOVF
M1
Bit Functions and Addresses
WDRUN
M0
WDCLK
GATE
WDS2
C/T
WDS1
M1
87LPC762
LSB
WDS0
Preliminary data
M0
Reset
Value
Note 4
00h
00h
xxh