2004 Microchip Technology Inc. DS70046C-page vii
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SECTION 16. QUADRATURE ENCODER INTERFACE (QEI) 16-1
Module Introduction ........................................................................................................................................ 16-2
Control and Status Registers ......................................................................................................................... 16-4
Programmable Digital Noise Filters ................................................................................................................ 16-9
Quadrature Decoder .................................................................................................................................... 16-10
16-bit Up/Down Position Counter ................................................................................................................. 16-12
Using QEI as an Alternate 16-bit Timer/Counter .......................................................................................... 16-16
Quadrature Encoder Interface Interrupts ..................................................................................................... 16-17
I/O Pin Control .............................................................................................................................................. 16-18
QEI Operation During Power Saving Modes ................................................................................................ 16-19
Effects of a Reset ......................................................................................................................................... 16-19
Design Tips .................................................................................................................................................. 16-21
Related Application Notes ............................................................................................................................ 16-22
Revision History ........................................................................................................................................... 16-23
SECTION 17. 10-BIT A/D CONVERTER 17-1
Introduction .................................................................................................................................................... 17-2
Control Registers ........................................................................................................................................... 17-4
A/D Result Buffer ........................................................................................................................................... 17-4
A/D Terminology and Conversion Sequence ............................................................................................... 17-11
A/D Module Configuration ............................................................................................................................ 17-13
Selecting the Voltage Reference Source ..................................................................................................... 17-13
Selecting the A/D Conversion Clock ............................................................................................................ 17-13
Selecting Analog Inputs for Sampling .......................................................................................................... 17-14
Enabling the Module .................................................................................................................................... 17-16
Specifying the Sample/Conversion Sequence ............................................................................................. 17-16
How to Start Sampling ................................................................................................................................. 17-17
How to Stop Sampling and Start Conversions ............................................................................................. 17-18
Controlling Sample/Conversion Operation ................................................................................................... 17-29
Specifying How Conversion Results are Written Into the Buffer .................................................................. 17-30
Conversion Sequence Examples ................................................................................................................. 17-31
A/D Sampling Requirements ........................................................................................................................ 17-45
Reading the A/D Result Buffer ..................................................................................................................... 17-46
Transfer Function ......................................................................................................................................... 17-47
A/D Accuracy/Error ...................................................................................................................................... 17-47
Connection Considerations .......................................................................................................................... 17-47
Initialization .................................................................................................................................................. 17-48
Operation During Sleep and Idle Modes ...................................................................................................... 17-49
Effects of a Reset ......................................................................................................................................... 17-49
Special Function Registers Associated with the 10-bit A/D Converter ......................................................... 17-50
Design Tips .................................................................................................................................................. 17-51
Related Application Notes ............................................................................................................................ 17-52
Revision History ........................................................................................................................................... 17-53
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