MC68HC908GP20 Datasheet, PDF (88/406 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

5.2 Introduction
This section describes the 8-bit analog-to-digital converter (ADC).
5.3 Features
Features of the ADC module include:
• Eight channels with multiplexed input
• Linear successive approximation with monotonicity
• 8-bit resolution
• Single or continuous conversion
• Conversion complete flag or conversion complete interrupt
• Selectable ADC clock
5.4 Functional Description
The ADC provides eight pins for sampling external sources at pins
PTB7/AD7–PTB0/AD0. An analog multiplexer allows the single ADC
converter to select one of eight ADC channels as ADC voltage in
(ADCV_IN). ADCV_IN is converted by the successive approximation
register-based analog-to-digital converter. When the conversion is
completed, ADC places the result in the ADC data register and sets a
flag or generates an interrupt. (See Figure 5-1.)
NOTE:
References to DMA (direct-memory access) and associated functions
are only valid if the MCU has a DMA module. If the MCU has no DMA,
any DMA-related register bits should be left in their reset state for
expected MCU operation.
Advance Information
88
MC68HC908GP20 — Rev 2.1
Freescale Semiconductor