mc68hc908mr8 Freescale Semiconductor, Inc, mc68hc908mr8 Datasheet - Page 313

• Manufacturer Part Number: mc68hc908mr8
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

18.4.1 ADC Port I/O Pins
MC68HC908MR8 — Rev 4.1
Freescale Semiconductor
INTERRUPT
ADC
INTERNAL
DATA BUS
INTERRUPT
LOGIC
AIEN
READ PTA
PTA6/ATD6:PTA0/ATD6 are general-purpose input/output (I/O) pins
that are shared 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 logic when that port is
selected by the ADC multiplexer. The remaining ADC channels/port pins
are controlled by the port logic and can be used as general-purpose
input/output (I/O) pins. Writes to the port register or data direction
register (DDR) will not have any effect on the port pin that is selected by
the ADC. Read of a port pin which is in use by the ADC will return a
logic 0.
CONVERSION
COMPLETE
CGMXCLK
Figure 18-1. ADC Block Diagram
f
OP
Analog-to-Digital Converter (ADC)
ADC CLOCK
ADC DATA REGISTERS
ADIV[2:0]
GENERATOR
CLOCK
ADC
ADICLK
ADC VOLTAGE IN
ADVIN
DISABLE
Analog-to-Digital Converter (ADC)
CHANNEL
SELECT
ADC CHANNEL X
Functional Description
PTAx
Technical Data
ADCH6:ADCH0
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