AT89C51IC2-SLSCM datasheet(143/146 Pages) ATMEL

143 / 146 page

AT89C51IC2

4301A–8051–01/04

Features ................................................................................................. 1

Description ............................................................................................ 2

Block Diagram ....................................................................................... 3

SFR Mapping ......................................................................................... 4

Pin Configurations .............................................................................. 10

Oscillators ........................................................................................... 14

Overview............................................................................................................. 14

Registers............................................................................................................. 14

Functional Block Diagram................................................................................... 17

Operating Modes ................................................................................................ 17

Design Considerations........................................................................................ 19

Timer 0: Clock Inputs.......................................................................................... 20

Enhanced Features ............................................................................. 21

X2 Feature and OSCA Clock Generation ........................................................... 21

Dual Data Pointer Register ................................................................ 25

Expanded RAM (XRAM) ..................................................................... 27

Timer 2 ................................................................................................. 30

Auto-Reload Mode.............................................................................................. 30

Programmable Clock-Output .............................................................................. 31

Programmable Counter Array PCA ................................................... 35

PCA Capture Mode............................................................................................. 43

16-bit Software Timer/ Compare Mode............................................................... 43

High Speed Output Mode ................................................................................... 44

Pulse Width Modulator Mode.............................................................................. 45

PCA Watchdog Timer ......................................................................................... 46

Serial I/O Port ...................................................................................... 47

Framing Error Detection ..................................................................................... 47

Automatic Address Recognition.......................................................................... 48

Baud Rate Selection for UART for mode 1 and 3............................................... 50

UART Registers.................................................................................................. 54

Interrupt System ................................................................................. 58

Registers............................................................................................................. 59

Interrupt Sources and Vector Addresses............................................................ 66

AT89C51IC2-SLSCM Datasheet(PDF) 143 Page - ATMEL Corporation