IS89C51 Datasheet, PDF (4/48 Pages) Integrated Silicon Solution, Inc – CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 4-Kbytes of FLASH

IS89C51
Vcc
GND
P2.0-P2.7
P2
DRIVERS
RAM ADDR
REGISTER
ADDRESS
DECODER
& 128
BYTES RAM
P2
LATCH
P0.0-P0.7
P0
DRIVERS
P0
LATCH
ADDRESS
DECODER
&
4K FLASH
3 LOCK BITS
&
32 BYTES
ENCRYPTION
ISSI ^®
B
REGISTER
STACK
POINT
PCON
TL1
SCON
TH0
SBUF
TMOD
TL0
IE
TCON
TH1
IP
INTERRUPT BLOCK
SERIAL PORT BLOCK
TIMER BLOCK
ACC
TMP2
TMP1
ALU
PSW
PSEN
ALE/PROG
RST
EA/VPP
TIMING
AND
CONTROL
OSCILLATOR
XTAL1
XTAL2
P3
LATCH
P3
DRIVERS
P1
LATCH
P1
DRIVERS
PROGRAM
ADDRESS
REGISTER
PROGRAM
COUNTER
PC
INCREMENTER
BUFFER
DPTR
P3.0-P3.7
P1.0-P1.7
Figure 4. IS89C51 Block Diagram
4
1-800-379-4774 — Integrated Silicon Solution, Inc.
MC016-1C
11/21/98