MC68HC08AZ0 Datasheet, PDF (311/444 Pages) Motorola, Inc – Advance Information

Freescale Semiconductor, Inc.
Analog-to-Digital Converter (ADC)
Functional description
Functional description
Eight ADC channels are available for sampling external sources at pins
PTB7/ATD7–PTB0/ATD0. An analog multiplexer allows the single ADC
converter to select one ADC channel as ADC Voltage IN (ADCVIN).
ADCVIN is converted by the successive approximation register based
counter. When the conversion is completed, ADC places the result in the
ADC data register and sets a flag or generates an interrupt. See Figure
1.
INTERNAL
DATA BUS
READ DDRB
WRITE DDRB
WRITE PTB
RESET
READ PTB/PTD
DDRBx
PTBx
ADC DATA REGISTER
DISABLE
PTBx
(ADC Channel x)
DISABLE
CONVERSION
INTERRUPT ^COMPLETE
LOGIC
ADC
ADC VOLTAGE IN
(ADVIN)
ADCH[4:0]
CHANNEL
SELECT
AIEN
COCO/IDMAS
ADC CLOCK
CGMXCLK
BUS CLOCK
CLOCK
GENERATOR
ADIV[2:0]
ADICLK
Figure 1. ADC block diagram
3-adc
MOTOROLA
Analog-to-Digital Converter (ADC)
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MC68HC08AZ0
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