M68HC08 Datasheet, PDF (153/230 Pages) Motorola, Inc – Microcontrollers

Analog-to-Digital Converter (ADC)
Functional Description
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.
INTERNAL
DATA BUS
READ DDRA
WRITE DDRA
WRITE PTA
READ PTA
RESET
DDRAx
PTAx
DISABLE
ADCx
ADC DATA REGISTER
DISABLE
ADC CHANNEL x
CONVERSION
INTERRUPT COMPLETE
LOGIC
AIEN COCO
BUS CLOCK
ADC VOLTAGE IN
ADCVIN
CHANNEL
ADC
SELECT
(1 OF 4 CHANNELS)
ADC CLOCK
CLOCK
GENERATOR
ADIV[2:0]
Figure 11-2. ADC Block Diagram
CH[4:0]
MC68HC908QY4•MC68HC908QT4•MC68HC908QY2•MC68HC908QT2•MC68HC908QY1•MC68HC908QT1
MOTOROLA
Analog-to-Digital Converter (ADC)
153