AT89C5131-RDTIL datasheet(174/176 Pages) ATMEL

174 / 176 page

4136B–USB–09/03

Application-Programming-Interface .................................................................... 44

XROW Bytes....................................................................................................... 44

Hardware Conditions .......................................................................................... 44

Hardware Security Byte ...................................................................................... 45

On-chip Expanded RAM (ERAM) ....................................................... 46

Timer 2 ................................................................................................. 49

Auto-reload Mode ............................................................................................... 49

Programmable Clock Output .............................................................................. 50

Programmable Counter Array (PCA) ................................................ 54

PCA Capture Mode............................................................................................. 61

16-bit Software Timer/Compare Mode................................................................ 61

High Speed Output Mode ................................................................................... 62

Pulse Width Modulator Mode.............................................................................. 63

PCA Watchdog Timer ......................................................................................... 64

Serial I/O Port ...................................................................................... 65

Framing Error Detection ..................................................................................... 65

Automatic Address Recognition.......................................................................... 66

Baud Rate Selection for UART for Mode 1 and 3............................................... 68

UART Registers.................................................................................................. 71

Interrupt System ................................................................................. 75

Overview............................................................................................................. 75

Registers............................................................................................................. 76

Interrupt Sources and Vector Addresses............................................................. 83

Keyboard Interface ............................................................................. 84

Introduction ......................................................................................................... 84

Description.......................................................................................................... 84

Registers............................................................................................................. 85

Programmable LED ............................................................................ 88

Serial Peripheral Interface (SPI) ........................................................ 89

Features.............................................................................................................. 89

Signal Description............................................................................................... 89

Functional Description ........................................................................................ 91

Two Wire Interface (TWI) .................................................................... 98

Introduction ......................................................................................................... 98

Description........................................................................................................ 100

Notes ................................................................................................................ 103

Registers............................................................................................................112

AT89C5131-RDTIL Folha de dados(PDF) 174 Page - ATMEL Corporation