Rainbow Electronics ATmega32L - Manual (Page 310)

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ATmega32(L)
2503C–AVR–10/02
Compare Match Output Unit ............................................................................. 115
Modes of Operation .......................................................................................... 116
Timer/Counter Timing Diagrams....................................................................... 120
8-bit Timer/Counter Register Description ......................................................... 122
Asynchronous Operation of the Timer/Counter ................................................ 125
Timer/Counter Prescaler................................................................................... 128
Serial Peripheral Interface – SPI...................................................... 130
SS Pin Functionality.......................................................................................... 134
Data Modes ...................................................................................................... 137
USART ............................................................................................... 138
Overview........................................................................................................... 138
Clock Generation .............................................................................................. 139
Frame Formats ................................................................................................. 142
USART Initialization.......................................................................................... 144
Data Transmission – The USART Transmitter ................................................. 145
Data Reception – The USART Receiver .......................................................... 148
Asynchronous Data Reception ......................................................................... 151
Multi-processor Communication Mode ............................................................. 155
Accessing UBRRH/ UCSRC Registers............................................................. 156
USART Register Description ............................................................................ 157
Examples of Baud Rate Setting........................................................................ 163
Two-wire Serial Interface ................................................................. 167
Features............................................................................................................ 167
Two-wire Serial Interface Bus Definition........................................................... 167
Data Transfer and Frame Format ..................................................................... 168
Multi-master Bus Systems, Arbitration and Synchronization ............................ 170
Overview of the TWI Module ............................................................................ 173
TWI register description.................................................................................... 175
Using the TWI ................................................................................................... 178
Transmission Modes......................................................................................... 181
Multi-master Systems and Arbitration............................................................... 194
Analog Comparator .......................................................................... 196
Analog Comparator Multiplexed Input .............................................................. 198
Analog to Digital Converter ............................................................. 199
Features............................................................................................................ 199
Operation .......................................................................................................... 200
Starting a Conversion ....................................................................................... 201
Prescaling and Conversion Timing ................................................................... 202
Changing Channel or Reference Selection ...................................................... 205
ADC Noise Canceler......................................................................................... 207