MC68HC08JK1 Datasheet, PDF (129/198 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Analog-to-Digital Converter (ADC)
Functional Description
INTERNAL
DATA BUS
READ DDRB/DDRD
WRITE DDRB/DDRD
WRITE PTB/PTD
RESET
DDRBx/DDRDx
PTBx/PTDx
DISABLE
ADCx
READ PTB/PTD
ADC DATA REGISTER
DISABLE
ADC CHANNEL x
CONVERSION
INTERRUPT COMPLETE
LOGIC
AIEN COCO
BUS CLOCK
ADC
ADC VOLTAGE IN
ADCVIN
CHANNEL
SELECT
(1 OF 12 CHANNELS)
ADC CLOCK
CLOCK
GENERATOR
CH[4:0]
ADIV[2:0] ADICLK
Figure 11-2. ADC Block Diagram
11.4.1 ADC Port I/O Pins
PTB0–PTB7 and PTD0–PTD3 are general-purpose I/O pins that are
shared with the ADC channels. The channel select bits (ADC Status and
Control register, $003C), 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.
MC68H(R)C08JL3 — Rev. 4
MOTOROLA
Analog-to-Digital Converter (ADC)
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Technical Data
129