ATMEGA325-16AJ ATMEL [ATMEL Corporation], ATMEGA325-16AJ Datasheet - Page 343

• Manufacturer Part Number: ATMEGA325-16AJ
• Description: 8-bit Microcontroller with In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

2570A–AVR–09/04
8-bit Timer/Counter2 with PWM and Asynchronous Operation .. 124
Serial Peripheral Interface – SPI..................................................... 143
USART0 ............................................................................................ 151
Universal Serial Interface – USI...................................................... 177
Analog Comparator ......................................................................... 189
Analog to Digital Converter ............................................................ 193
Overview........................................................................................................... 124
Timer/Counter Clock Sources........................................................................... 125
Counter Unit...................................................................................................... 125
Output Compare Unit........................................................................................ 126
Compare Match Output Unit ............................................................................. 128
Modes of Operation .......................................................................................... 129
Timer/Counter Timing Diagrams....................................................................... 133
8-bit Timer/Counter Register Description ......................................................... 135
Asynchronous operation of the Timer/Counter ................................................. 138
Timer/Counter Prescaler................................................................................... 141
SS Pin Functionality.......................................................................................... 147
Data Modes ...................................................................................................... 150
Overview........................................................................................................... 151
Clock Generation .............................................................................................. 152
Frame Formats ................................................................................................. 155
USART Initialization.......................................................................................... 156
Data Transmission – The USART Transmitter ................................................. 158
Data Reception – The USART Receiver .......................................................... 161
Asynchronous Data Reception ......................................................................... 164
Multi-processor Communication Mode ............................................................. 168
USART Register Description ............................................................................ 169
Examples of Baud Rate Setting........................................................................ 173
Overview........................................................................................................... 177
Functional Descriptions .................................................................................... 178
Alternative USI Usage ...................................................................................... 184
USI Register Descriptions................................................................................. 184
Analog Comparator Multiplexed Input .............................................................. 192
Features............................................................................................................ 193
Operation .......................................................................................................... 194
Starting a Conversion ....................................................................................... 195
Prescaling and Conversion Timing ................................................................... 196
Changing Channel or Reference Selection ...................................................... 198
ADC Noise Canceler......................................................................................... 199
ADC Conversion Result.................................................................................... 203
ATmega325/3250/645/6450
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