DS70046C-page viii ď›™ 2004 Microchip Technology Inc.
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SECTION 18. 12-BIT A/D CONVERTER 18-1
Introduction .................................................................................................................................................... 18-2
Control Registers ........................................................................................................................................... 18-4
A/D Result Buffer ........................................................................................................................................... 18-4
A/D Terminology and Conversion Sequence ............................................................................................... 18-10
A/D Module Configuration ............................................................................................................................ 18-11
Selecting the Voltage Reference Source ..................................................................................................... 18-11
Selecting the A/D Conversion Clock ............................................................................................................ 18-12
Selecting Analog Inputs for Sampling .......................................................................................................... 18-12
Enabling the Module .................................................................................................................................... 18-14
How to Start Sampling ................................................................................................................................. 18-14
How to Stop Sampling and Start Conversions ............................................................................................. 18-14
Controlling Sample/Conversion Operation ................................................................................................... 18-19
Specifying How Conversion Results are Written into the Buffer .................................................................. 18-19
Conversion Sequence Examples ................................................................................................................. 18-21
A/D Sampling Requirements ........................................................................................................................ 18-26
Reading the A/D Result Buffer ..................................................................................................................... 18-27
Transfer Function ......................................................................................................................................... 18-28
A/D Accuracy/Error ...................................................................................................................................... 18-28
Connection Considerations .......................................................................................................................... 18-28
Initialization .................................................................................................................................................. 18-29
Operation During Sleep and Idle Modes ...................................................................................................... 18-30
Effects of a Reset ......................................................................................................................................... 18-30
Special Function Registers Associated with the 12-bit A/D Converter ......................................................... 18-31
Design Tips .................................................................................................................................................. 18-32
Related Application Notes ............................................................................................................................ 18-33
Revision History ........................................................................................................................................... 18-34
SECTION 19. UART 19-1
Introduction .................................................................................................................................................... 19-2
Control Registers ........................................................................................................................................... 19-3
UART Baud Rate Generator (BRG) ............................................................................................................... 19-8
UART Configuration ..................................................................................................................................... 19-10
UART Transmitter ........................................................................................................................................ 19-11
UART Receiver ............................................................................................................................................ 19-14
Using the UART for 9-bit Communication .................................................................................................... 19-18
Receiving Break Characters ........................................................................................................................ 19-19
Initialization .................................................................................................................................................. 19-20
Other Features of the UART ........................................................................................................................ 19-21
UART Operation During CPU Sleep and Idle Modes ................................................................................... 19-21
Registers Associated with UART Module ..................................................................................................... 19-22
Design Tips .................................................................................................................................................. 19-23
Related Application Notes ............................................................................................................................ 19-24
Revision History ........................................................................................................................................... 19-25
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