MC68HC705P9CDW FREESCALE [Freescale Semiconductor, Inc], MC68HC705P9CDW Datasheet - Page 89

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

7.5.2 Data Direction Register C (DDRC)
MC68HC705P9 — Rev. 4.0
MOTOROLA
NOTE:
Data direction register C determines whether each port C pin is an input
or an output.
DDRC[7:0] — Data Direction Register C Bits
Avoid glitches on port C pins by writing to the port C data register before
changing data direction register C bits from 0 to 1.
Writing to bits DDRC7–DDRC3 while the ADC is on can produce
unpredictable ADC results.
Figure 7-10
Reset:
$0006
Read:
Write:
These read/write bits control port C data direction. Reset clears
DDRC[7:0], configuring all port C pins as inputs.
Freescale Semiconductor, Inc.
For More Information On This Product,
1 = Corresponding port C pin configured as output
0 = Corresponding port C pin configured as input
DDRC7
READ DATA DIRECTION REGISTER C ($0006)
WRITE DATA DIRECTION REGISTER C ($0006)
WRITE PORT C DATA REGISTER ($0002)
READ PORT C DATA REGISTER ($0002)
Bit 7
0
Parallel Input/Output (I/O) Ports
Figure 7-9. Data Direction Register C (DDRC)
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shows the I/O logic of port C.
DDRC6
6
0
Figure 7-10. Port C I/O Logic
DDRC5
5
0
RESET
DDRC4
4
0
DDRCx
PCx
DDRC3
3
0
Parallel Input/Output (I/O) Ports
DDRC2
2
0
DDRC1
1
0
Technical Data
DDRC0
Bit 0
Port C
0
PCx
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