Datasheet

 2018 Microchip Technology Inc. Data Sheet Complete DS40002072A-page 6
ATmega32A
19.2 Overview........................................................................................................ 136
19.3 SS
Pin Functionality ...................................................................................... 140
19.4 Data Modes ................................................................................................... 142
20 USART ................................................................................................... 144
20.1 Features ........................................................................................................ 144
20.2 Overview........................................................................................................ 144
20.3 Clock Generation........................................................................................... 146
20.4 Frame Formats .............................................................................................. 148
20.5 USART Initialization....................................................................................... 149
20.6 Data Transmission – The USART Transmitter .............................................. 150
20.7 Data Reception – The USART Receiver ....................................................... 153
20.8 Asynchronous Data Reception ...................................................................... 157
20.9 Multi-processor Communication Mode .......................................................... 160
20.10 Accessing UBRRH/UCSRC Registers ......................................................... 161
20.11 Register Description ...................................................................................... 163
20.12 Examples of Baud Rate Setting..................................................................... 167
21 Two-wire Serial Interface ..................................................................... 172
21.1 Features ........................................................................................................ 172
21.2 Two-wire Serial Interface Bus Definition........................................................ 172
21.3 Data Transfer and Frame Format.................................................................. 173
21.4 Multi-master Bus Systems, Arbitration and Synchronization......................... 175
21.5 Overview of the TWI Module ......................................................................... 177
21.6 Using the TWI................................................................................................ 179
21.7 Transmission Modes ..................................................................................... 181
21.8 Multi-master Systems and Arbitration............................................................ 192
21.9 Register Description ...................................................................................... 195
22 Analog Comparator .............................................................................. 198
22.1 Overview........................................................................................................ 198
22.2 Analog Comparator Multiplexed Input ........................................................... 198
22.3 Register Description ...................................................................................... 199
23 Analog to Digital Converter ................................................................. 201
23.1 Features ........................................................................................................ 201
23.2 Overview........................................................................................................ 201
23.3 Operation....................................................................................................... 202
23.4 Starting a Conversion .................................................................................... 203