MC68HC08AZ32 Datasheet, PDF (291/424 Pages) Motorola, Inc – Advance Information

Freescale Semiconductor, Inc.
Analog-to-Digital Converter (ADC)
Functional description
Functional description
Eight or fifteen ADC channels are available for sampling external
sources at pins PTD6/TACLK–PTD0 and 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/DDRDx
PTBx/PTDx
ADC DATA REGISTER
DISABLE
PTBx/PTDx
(ADC Channel x)
DISABLE
CONVERSION
INTERRUPT ^COMPLETE
LOGIC
ADC
ADC VOLTAGE IN
(ADVIN)
ADCH[4:0]
CHANNEL
SELECT
AIEN
COCO
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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MC68HC08AZ32
289