MC68HC705P9CDW FREESCALE [Freescale Semiconductor, Inc], MC68HC705P9CDW Datasheet - Page 88

• Manufacturer Part Number: MC68HC705P9CDW
• Description: Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Parallel Input/Output (I/O) Ports
7.5.1 Port C Data Register (PORTC)
Technical Data
88
Function:
Alternate
The port C data register contains a latch for each of the eight port C pins.
PC[7:0] — Port C Data Bits
V
AN[3:0] — Analog Input Bits
Reset:
$0002
Read:
Write:
RH
These read/write bits are software programmable. Data direction of
each port C pin is under the control of the corresponding bit in data
direction register C. Reset has no effect on port C data.
When the ADC is turned on, the PC7/V
reference voltage.
When the ADC is turned on, the AN0–AN3 pins are software-
selectable analog inputs. Unused analog inputs can be used as digital
inputs, but pins PC3/AN3, PC4/AN2, PC5/AN1, and PC6/AN0 cannot
be used as digital outputs while the ADC is on. Only pins PC0, PC1,
and PC2 can be used as digital outputs when the ADC is on.
The port C data register reads normally while the ADC is on, except
that the bit corresponding to the currently selected ADC input pin
reads as logic zero.
Writing to bits PC7–PC3 while the ADC is on can produce
unpredictable ADC results.
Freescale Semiconductor, Inc.
— Voltage Reference High Bit
For More Information On This Product,
V RH
Figure 7-8. Port C Data Register (PORTC)
Bit 7
PC7
Parallel Input/Output (I/O) Ports
Go to: www.freescale.com
PC6
AN0
6
PC5
AN1
5
Unaffected by reset
PC4
AN2
4
PC3
AN3
RH
3
pin is the positive ADC
MC68HC705P9 — Rev. 4.0
PC2
2
PC1
1
MOTOROLA
Bit 0
PC0