MC68HC908GR4MP datasheet(81/408 Pages) FREESCALE

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Analog-to-Digital Converter (ADC)

Functional Description

MC68HC908GR8 — Rev 4.0

Technical Data

MOTOROLA

Analog-to-Digital Converter (ADC)

Figure 5-1. ADC Block Diagram

5.4.1 ADC Port I/O Pins

PTB5/ATD5–PTB0/ATD0 are general-purpose I/O (input/output) pins

that share with the ADC channels. The channel select bits define which

ADC channel/port pin will be used as the input signal. The ADC

overrides the port I/O logic by forcing that pin as input to the ADC. The

remaining ADC channels/port pins are controlled by the port I/O logic

and can be used as general-purpose I/O. Writes to the port register or

DDR will not have any affect on the port pin that is selected by the ADC.

Read of a port pin in use by the ADC will return a logic 0.

INTERNAL

DATA BUS

READ DDRBx

WRITE DDRBx

RESET

WRITE PTBx

READ PTBx

PTBx

DDRBx

PTBx

INTERRUPT

LOGIC

CHANNEL

SELECT

ADC

CLOCK

GENERATOR

CONVERSION

COMPLETE

ADC

(VADIN)

ADC CLOCK

CGMXCLK

BUS CLOCK

ADCH4–ADCH0

ADC DATA REGISTER

AIEN

COCO

DISABLE

ADC CHANNEL x

ADIV2–ADIV0

ADICLK

VOLTAGE IN

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