ATmega165 datasheet(333/336 Pages) ATMEL

333 / 336 page

iii

ATmega165/V

2573G–AVR–07/09

Counter Unit...................................................................................................... 121

Output Compare Unit........................................................................................ 122

Compare Match Output Unit ............................................................................. 124

Modes of Operation .......................................................................................... 125

Timer/Counter Timing Diagrams....................................................................... 129

8-bit Timer/Counter Register Description ......................................................... 131

Asynchronous operation of the Timer/Counter ................................................. 134

Timer/Counter Prescaler................................................................................... 138

Serial Peripheral Interface – SPI..................................................... 139

SS Pin Functionality.......................................................................................... 144

Data Modes ...................................................................................................... 147

USART .............................................................................................. 148

Overview........................................................................................................... 148

Clock Generation .............................................................................................. 149

Frame Formats ................................................................................................. 152

USART Initialization.......................................................................................... 153

Data Transmission – The USART Transmitter ................................................. 155

Data Reception – The USART Receiver .......................................................... 158

Asynchronous Data Reception ......................................................................... 161

Multi-processor Communication Mode ............................................................. 165

USART Register Description ............................................................................ 166

Examples of Baud Rate Setting........................................................................ 171

USI – Universal Serial Interface ...................................................... 175

Overview........................................................................................................... 175

Functional Descriptions .................................................................................... 176

Alternative USI Usage ...................................................................................... 181

USI Register Descriptions................................................................................. 181

Analog Comparator ......................................................................... 186

Analog Comparator Multiplexed Input .............................................................. 188

Analog to Digital Converter ............................................................ 189

Features............................................................................................................ 189

Operation .......................................................................................................... 190

Starting a Conversion ....................................................................................... 191

Prescaling and Conversion Timing ................................................................... 192

Changing Channel or Reference Selection ...................................................... 195

ADC Noise Canceler......................................................................................... 196

ADC Conversion Result.................................................................................... 200

JTAG Interface and On-chip Debug System ................................. 206

Overview........................................................................................................... 206

Test Access Port – TAP.................................................................................... 206

ATmega165 Datasheet(PDF) 333 Page - ATMEL Corporation

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