at89c51ac3-s3sim ATMEL Corporation, at89c51ac3-s3sim Datasheet - Page 2

• Manufacturer Part Number: at89c51ac3-s3sim
• Description: At89c51ac3 Enhanced 8-bit Microcontroller With 64kb Flash Memory
• Manufacturer: ATMEL Corporation

Block Diagram
2
AT89C51AC3
XTAL1
XTAL2
PSEN
WR
ALE
RD
EA
Notes:
CPU
1. 8 analog Inputs/8 Digital I/O
2. 5-Bit I/O Port
Timer 0
Timer 1
UART
CORE
C51
256x8
RAM
Ctrl
INT
IB-bus
64k x 8
Flash
Port 0Port 1 Port 2 Port 3
Parallel I/O Ports and Ext. Bus
loader
Boot
2kx8
PROM
2kx8
EE
ERAM
2048
Port 4
Watch
Dog
PCA
Emul
Unit
Timer2
10 bit
ADC
4383D–8051–02/08
Interface
SPI