89C51RB2 Datasheet, PDF (4/52 Pages) NXP Semiconductors – 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM

Philips Semiconductors
80C51 8-bit Flash microcontroller family
16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM
Preliminary specification
89C51RB2/89C51RC2/
89C51RD2
BLOCK DIAGRAM
V_CC
V_SS
RAM ADDR
REGISTER
RAM
P0.0–P0.7
PORT 0
DRIVERS
PORT 0
LATCH
P2.0–P2.7
PORT 2
DRIVERS
PORT 2
LATCH
FLASH
B
REGISTER
ACC
TMP2
TMP1
STACK
POINTER
8
PROGRAM
ADDRESS
REGISTER
ALU
PSW
PSEN
ALE
EAV_PP
RST
TIMING
AND
CONTROL
PD
OSCILLATOR
XTAL1
XTAL2
PORT 1
LATCH
PORT 1
DRIVERS
P1.0–P1.7
SFRs
TIMERS
P.C.A.
BUFFER
PC
INCRE-
MENTER
8
16
PROGRAM
COUNTER
PORT 3
LATCH
DPTR’S
MULTIPLE
PORT 3
DRIVERS
P3.0–P3.7
SU01065
1999 Sep 23
4