M68HC08 datasheet(155/288 Pages) FREESCALE

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Analog-to-Digital Converter (ADC)

MC68HC908BD48 — Rev. 2.1

Data Sheet

Freescale Semiconductor

Analog-to-Digital Converter (ADC)

155

Figure 12-1. ADC Block Diagram

12.4.1 ADC Port I/O Pins

PTC5–PTC0 are general-purpose I/O pins that are shared with the ADC

channels. The channel select bits (ADC status control register, $005D),

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

INTERNAL

DATA BUS

INTERRUPT

LOGIC

CHANNEL

SELECT

ADC

CLOCK

GENERATOR

CONVERSION

COMPLETE

ADC VOLTAGE IN

ADCVIN

ADC CLOCK

BUS CLOCK

ADCH[4:0]

ADC DATA REGISTER

ADIV[2:0]

AIEN

COCO

DISABLE

ADC CHANNEL x

READ DDRC

WRITE DDRC

RESET

WRITE PTC

READ PTC

PTCx/ADCx

DDRCx

PTCx

(1 OF 6 CHANNELS)

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