Datasheet

Analog-to-Digital Converter (ADC)
Functional Description
MC68HC908QY4•MC68HC908QT4•MC68HC908QY2•MC68HC908QT2•MC68HC908QY1•MC68HC908QT1
MOTOROLA Analog-to-Digital Converter (ADC) 153
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voltage input (ADCVIN). ADCVIN is converted by the successive
approximation register-based counters. The ADC resolution is eight bits.
When the conversion is completed, ADC puts the result in the ADC data
register and sets a flag or generates an interrupt.
Figure 11-2 shows a block diagram of the ADC.
Figure 11-2. ADC Block Diagram
INTERNAL
DATA BUS
INTERRUPT
LOGIC
CHANNEL
SELECT
ADC
CLOCK
GENERATOR
CONVERSION
COMPLETE
ADC VOLTAGE IN
ADCVIN
ADC CLOCK
BUS CLOCK
CH[4:0]
ADC DATA REGISTER
ADIV[2:0]
AIEN COCO
DISABLE
DISABLE
ADC CHANNEL x
READ DDRA
WRITE DDRA
RESET
WRITE PTA
READ PTA
DDRAx
PTAx
(1 OF 4 CHANNELS)
ADCx