P87LPC764BD NXP Semiconductors, P87LPC764BD Datasheet - Page 9

• Manufacturer Part Number: P87LPC764BD
• Description: MCU 8-Bit 87LP 80C51 CISC 4KB EPROM 5V 20-Pin SO Tube
• Manufacturer: NXP Semiconductors

Specifications of P87LPC764BD

• Package: 20SO
• Device Core: 80C51
• Family Name: 87LP
• Maximum Speed: 20 MHz
• Ram Size: 128 Byte
• Program Memory Size: 4 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: 0 to 70 °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:
2003 Sep 03
PSW*
PT0AD#
SCON*
SBUF
SADDR#
SADEN#
SP
TCON*
TH0
TH1
TL0
TL1
TMOD
WDCON#
WDRST#
Low power, low price, low pin count (20 pin)
microcontroller with 4 kbyte OTP
Name
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.
Program status word
Port 0 digital input disable
Serial port control
Serial port data buffer
register
Serial port address register
Serial port address enable
Stack pointer
Timer 0 and 1 control
Timer 0 high byte
Timer 1 high byte
Timer 0 low byte
Timer 1 low byte
Timer 0 and 1 mode
Watchdog control register
Watchdog reset register
Description
Address
SFR
D0h
8Ch
8Dh
F6h
98h
99h
A9h
B9h
81h
88h
8Ah
8Bh
89h
A7h
A6h
GATE
SM0
MSB
TF1
CY
D7
9F
8F
–
SM1
TR1
C/T
D6
AC
9E
8E
–
8
WDOVF
SM2
TF0
M1
D5
9D
8D
F0
Bit Functions and Addresses
WDRUN
REN
RS1
TR0
M0
D4
9C
8C
WDCLK
GATE
RS0
TB8
IE1
D3
9B
8B
WDS2
RB8
C/T
OV
IT1
D2
9A
8A
WDS1
IE0
M1
D1
F1
99
89
TI
P87LPC764
WDS0
LSB
IT0
M0
D0
98
RI
88
P
Product data
00h
00h
00h
xxh
00h
00h
07h
00h
00h
00h
00h
00h
00h
Note 4
xxh
Reset
Value