M68HC08 datasheet(154/288 Pages) FREESCALE

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Analog-to-Digital Converter (ADC)

Data Sheet

MC68HC908BD48 — Rev. 2.1

154

Analog-to-Digital Converter (ADC)

Freescale Semiconductor

12.3 Features

Features of the ADC module include:

•

6 Channels ADC with Multiplexed Input

•

Linear Successive Approximation

•

8-Bit Resolution

•

Single or Continuous Conversion

•

Conversion Complete Flag or Conversion Complete Interrupt

•

Selectable ADC Clock

12.4 Functional Description

Six ADC channels are available for sampling external sources at pins

PTC5–PTC0. An analog multiplexer allows the single ADC converter to

select one of the 6 ADC channels as ADC voltage input (ADCVIN).

ADCVIN is converted by the successive approximation register-based

counters. The ADC resolution is 8 bits. When the conversion is

completed, ADC puts the result in the ADC data register and sets a flag

or generates an interrupt. Figure 12-1 shows a block diagram of the

ADC.

Table 12-1. ADC Register Summary

Addr.

Bit 7

654321

Bit 0

$005D ADC Status and Control

(ADSCR)

Read:

COCO

AIEN

ADCO

ADCH4

ADCH3

ADCH2

ADCH1

ADCH0

Write:

Reset:

00011111

$005E

ADC Data Register

(ADR)

Read:

AD7

AD6

AD5

AD4

AD3

AD2

AD1

AD0

Write:

Reset:

Indeterminate after Reset

$005F

ADC Input Clock

(ADICLK)

Read:

ADIV2

ADIV1

ADIV0

00000

Write:

Reset:

00000000

= Unimplemented

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