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Analog-to-Digital Converter (ADC)

Technical Data

MC68HC908GR8 — Rev 4.0

Analog-to-Digital Converter (ADC)

MOTOROLA

5.3 Features

Features of the ADC module include:

•

Six 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 six pins for sampling external sources at pins

PTB5/ATD5–PTB0/ATD0. An analog multiplexer allows the single ADC

converter to select one of six ADC channels as ADC voltage in (VADIN).

VADIN 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.

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