MC68HC908GP32 Datasheet, PDF (91/410 Pages) Motorola, Inc – M68HC08 Family of 8-bit microcontroller units (MCUs)

Freescale Semiconductor, Inc.
Analog-to-Digital Converter (ADC)
Functional Description
INTERNAL
DATA BUS
READ DDRBx
WRITE DDRBx
RESET
WRITE PTBx
READ PTBx
DDRBx
PTBx
DISABLE
PTBx
ADC CHANNEL x
DISABLE
ADC DATA REGISTER
CONVERSION
INTERRUPT ^COMPLETE
LOGIC
ADC
ADC
VOLTAGE IN
(V_ADIN)
CHANNEL
SELECT
ADCH4–ADCH0
AIEN COCO
CGMXCLK
BUS CLOCK
ADC CLOCK
CLOCK
GENERATOR
ADIV2–ADIV0 ADICLK
Figure 5-1. ADC Block Diagram
5.4.1 ADC Port I/O Pins
PTB7/AD7–PTB0/AD0 are general-purpose I/O (input/output) pins that
share with the ADC channels. The channel select bits define which ADC
channel/port pin will be used as the input signal. The ADC overrides the
port I/O logic by forcing that pin as input to the ADC. The remaining ADC
channels/port pins are controlled by the port I/O logic and can be used
as general-purpose I/O. Writes to the port register or DDR will not have
any affect on the port pin that is selected by the ADC. Read of a port pin
in use by the ADC will return a logic 0.
MC68HC908GP32•MC68HC08GP32 — Rev. 6
MOTOROLA
Analog-to-Digital Converter (ADC)
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Technical Data
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