p80c550efaa NXP Semiconductors, p80c550efaa Datasheet - Page 3

• Manufacturer Part Number: p80c550efaa
• Description: 80c51 8-bit Microcontroller Family 4k/128 Otp/rom/romless, Channel Watchdog Timer
• Manufacturer: NXP Semiconductors

Philips Semiconductors
BLOCK DIAGRAM
1998 May 01
ALE/PROG
80C51 8-bit microcontroller family
4K/128 OTP/ROM/ROMless, 8 channel 8 bit A/D, watchdog timer
EA/V
PSEN
RST
PP
V
V
CC
SS
XTAL1
CONTROL
REGISTER
TIMING
RAM ADDR
REGISTER
OSCILLATOR
AND
B
PD
XTAL2
RAM
ACC
TMP2
DRIVERS
P1.0–P1.7
PORT 1
PORT 1
LATCH
PSW
DRIVERS
P0.0–P0.7
PORT 0
PORT 0
LATCH
ALU
TMP1
3
PCON
TL1
PORT AND TIMER BLOCKS
INTERRUPT, SERIAL
P2.0–P2.7
DRIVERS
SCON TMOD
SBUF
PORT 2
TH0
PORT 2
LATCH
TL0
IE
POINTER
DRIVERS
STACK
P3.0–P3.7
PORT 3
PORT 3
LATCH
TCON
TH1
IP
80C550/83C550/87C550
ROM/EPROM
PROGRAM
REGISTER
PROGRAM
ADDRESS
COUNTER
MENTER
INCRE-
BUFFER
DPTR
PC
Product specification
SU00005