Datasheet

Input/Output Ports (I/O)
Port C
MC68HC908GR8 — Rev 4.0 Technical Data
MOTOROLA Input/Output Ports (I/O) 217
16.5.2 Data Direction Register C
Data direction register C (DDRC) determines whether each port C pin is
an input or an output. Writing a logic 1 to a DDRC bit enables the output
buffer for the corresponding port C pin; a logic 0 disables the output
buffer.
DDRC1–DDRC0 — Data Direction Register C Bits
These read/write bits control port C data direction. Reset clears
DDRC1–DDRC0, configuring all port C pins as inputs.
1 = Corresponding port C pin configured as output
0 = Corresponding port C pin configured as input
NOTE: 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.
Figure 16-11 shows the port C I/O logic.
NOTE: For those devices packaged in a 28-pin DIP and SOIC package, PTC1,0
are not connected. Set DDRC1,0 to a 1 to configure PTC1,0 as outputs.
Address: $0006
Bit 7654321Bit 0
Read: 000000
DDRC1 DDRC0
Write:
Reset:00000000
= Unimplemented
Figure 16-10. Data Direction Register C (DDRC)
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cale Semiconductor,
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Freescale Semiconductor, Inc.
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