MC68HC908GR4MP datasheet(150/286 Pages) FREESCALE

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Input/Output Ports (I/O)

MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7

150

Freescale Semiconductor

16.4 Port C

Port C is a 2-bit, general-purpose bidirectional I/O port. Port C also has software configurable pullup

devices if configured as an input port.

16.4.1 Port C Data Register

The port C data register (PTC) contains a data latch for each of the two port C pins.

PTC1–PTC0 — Port C Data Bits

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.

NOTE

PTC is not available in a 28-pin DIP and SOIC package

16.4.2 Data Direction Register C

Data direction register C (DDRC) determines whether each port C pin is an input or an output. Writing a 1

to a DDRC bit enables the output buffer for the corresponding port C pin; a 0 disables the output buffer.

Table 16-3. Port B Pin Functions

DDRB Bit

PTB Bit

I/O Pin Mode

Accesses to DDRB

Accesses to PTB

Read/Write

Read

Write

X(1)

Input, Hi-Z(2)

DDRB5–DDRB0

PTB5–PTB0(3)

Output

DDRB5–DDRB0

PTB5–PTB0

Notes:

1. X = Don’t care

2. Hi-Z = High impedance

3. Writing affects data register, but does not affect input.

Address:

$0002

Bit 7

654321

Bit 0

Read:

000000

PTC1

PTC0

Write:

Reset:

Unaffected by reset

= Unimplemented

Figure 16-9. Port C Data Register (PTC)

Address:

$0006

Bit 7

654321

Bit 0

Read:

000000

DDRC1

DDRC0

Write:

Reset:

00000000

= Unimplemented

Figure 16-10. Data Direction Register C (DDRC)

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