ATmega128 datasheet(381/386 Pages) ATMEL

381 / 386 page

iii

2467S–AVR–07/09

ATmega128

Timer/Counter3, Timer/Counter2, and Timer/Counter1 Prescalers

143

8-bit Timer/Counter2 with PWM 145

Overview 145

Timer/Counter Clock Sources 146

Counter Unit 146

Output Compare Unit 147

Compare Match Output Unit 148

Modes of Operation 149

Timer/Counter Timing Diagrams 155

8-bit Timer/Counter Register Description 157

Output Compare Modulator (OCM1C2) 161

Overview 161

Description 161

Serial Peripheral Interface – SPI 163

SS Pin Functionality 167

Data Modes 170

USART 171

Overview 171

Clock Generation 173

Frame Formats 176

USART Initialization 177

Data Transmission – The USART Transmitter 178

Data Reception – The USART Receiver 180

Multi-processor Communication Mode 187

USART Register Description 189

Examples of Baud Rate Setting 194

Two-wire Serial Interface 198

Features 198

Two-wire Serial Interface Bus Definition 198

Data Transfer and Frame Format 199

Multi-master Bus Systems, Arbitration and Synchronization 201

Overview of the TWI Module 204

TWI Register Description 206

Using the TWI 208

Transmission Modes 213

Multi-master Systems and Arbitration 225

Analog Comparator 227

Analog Comparator Multiplexed Input 228

ATmega128 데이터시트(PDF) 381 Page - ATMEL Corporation

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