mc68hc908bd48 Freescale Semiconductor, Inc, mc68hc908bd48 Datasheet - Page 155

• Manufacturer Part Number: mc68hc908bd48
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

12.4.1 ADC Port I/O Pins
MC68HC908BD48
Freescale Semiconductor
INTERNAL
DATA BUS
AIEN
INTERRUPT
LOGIC
READ DDRC
WRITE DDRC
WRITE PTC
READ PTC
COCO
BUS CLOCK
—
Rev. 2.1
CONVERSION
COMPLETE
PTC5–PTC0 are general-purpose I/O pins that are shared with the ADC
channels. The channel select bits (ADC status control register, $005D),
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
RESET
Figure 12-1. ADC Block Diagram
ADC DATA REGISTER
Analog-to-Digital Converter (ADC)
GENERATOR
ADIV[2:0]
CLOCK
ADC
ADC CLOCK
DDRCx
PTCx
ADC VOLTAGE IN
ADCVIN
DISABLE
DISABLE
(1 OF 6 CHANNELS)
Analog-to-Digital Converter (ADC)
CHANNEL
SELECT
ADC CHANNEL x
PTCx/ADCx
Data Sheet
ADCH[4:0]
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