mc68hc908mr24 Freescale Semiconductor, Inc, mc68hc908mr24 Datasheet - Page 357

• Manufacturer Part Number: mc68hc908mr24
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

19.4.1 ADC Port I/O Pins
MC68HC908MR24 — Rev. 4.1
Freescale Semiconductor
INTERNAL
DATA BUS
AIEN
INTERRUPT
LOGIC
READ PTB/PTC
BUS CLOCK
COCO/IDMAS
CGMXCLK
CONVERSION
COMPLETE
PTC1/ATD9:PTC0/ATD8 and PTB7/ATD7:PTB0/ATD0 are
general-purpose 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 MUX. 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 DDR will not have
any affect 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.
Figure 19-1. ADC Block Diagram
ADIV[2:0]
Analog-to-Digital Converter (ADC)
GENERATOR
ADC DATA REGISTERS
CLOCK
ADC CLOCK
ADICLK
ADC
ADC VOLTAGE IN
ADVIN
DISABLE
Analog-to-Digital Converter (ADC)
CHANNEL
SELECT
ADC CHANNEL x
PTB/Cx
PTx
Advance Information
ADCH[4:0]
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