MC68HC08AZ16 Datasheet, PDF (304/527 Pages) Motorola, Inc – HCMOS Microcontroller Unit

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 of eight ADC channels 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.
NOTE: DMA section and associated functions are only valid if the MCU has a
DMA module.
INTERNAL
DATA BUS
READ DDRB
WRITE DDRB
WRITE PTB
RESET
READ PTB/PTD
DDRBx
PTBx
DISABLE
PTBx
(ADC Channel x)
ADC DATA REGISTER
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)
MC68HC08AZ32
303