Rainbow Electronics ATmega128RFA1 - Manual (Page 521)

521
8266A-MCU Wireless-12/09
ATmega128RFA1
23.6 Data Transmission – The USART Transmitter................................................. 345
23.7 Data Reception – The USART Receiver .......................................................... 348
23.8 Asynchronous Data Reception......................................................................... 352
23.9 Multi-processor Communication Mode............................................................. 355
23.10 Register Description ....................................................................................... 356
23.11 Examples of Baud Rate Setting ..................................................................... 365
24 USART in SPI Mode ...................................................................... 368
24.1 Overview........................................................................................................... 368
24.2 USART MSPIM vs. SPI .................................................................................... 368
24.3 SPI Data Modes and Timing ............................................................................ 369
24.4 Frame Formats ................................................................................................. 370
24.5 Data Transfer.................................................................................................... 371
24.6 USART MSPIM Register Description ............................................................... 373
25 2-wire Serial Interface................................................................... 377
25.1 Features ........................................................................................................... 377
25.2 2-wire Serial Interface Bus Definition ............................................................... 377
25.3 Data Transfer and Frame Format..................................................................... 378
25.4 Multi-master Bus Systems, Arbitration and Synchronization ........................... 380
25.5 Overview of the TWI Module ............................................................................ 382
25.6 Using the TWI................................................................................................... 384
25.7 Transmission Modes ........................................................................................ 387
25.8 Multi-master Systems and Arbitration .............................................................. 400
25.9 Register Description ......................................................................................... 401
26 AC – Analog Comparator ............................................................. 407
26.1 Analog Comparator Multiplexed Input.............................................................. 407
26.2 Register Description ......................................................................................... 408
27 ADC – Analog to Digital Converter.............................................. 410
27.1 Features ........................................................................................................... 410
27.2 Operation.......................................................................................................... 411
27.3 ADC Start-Up.................................................................................................... 412
27.4 Starting a Conversion....................................................................................... 413
27.5 Pre-scaling and Conversion Timing ................................................................. 413
27.6 Changing Channel or Reference Selection...................................................... 417
27.7 ADC Noise Canceller ....................................................................................... 420
27.8 ADC Conversion Result ................................................................................... 423
27.9 Internal Temperature Measurement................................................................. 425