MC68HC908GR4MP datasheet(218/408 Pages) FREESCALE

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Input/Output Ports (I/O)

Technical Data

MC68HC908GR8 — Rev 4.0

218

Input/Output Ports (I/O)

MOTOROLA

Figure 16-11. Port C I/O Circuit

When bit DDRCx is a logic 1, reading address $0002 reads the PTCx

data latch. When bit DDRCx is a logic 0, reading address $0002 reads

the voltage level on the pin. The data latch can always be written,

regardless of the state of its data direction bit. Table 16-4 summarizes

the operation of the port C pins.

READ DDRC ($0006)

WRITE DDRC ($0006)

RESET

WRITE PTC ($0002)

READ PTC ($0002)

PTCx

DDRCx

PTCx

VDD

INTERNAL

PTCPUEx

PULLUP

DEVICE

Table 16-4. Port C Pin Functions

PTCPUE Bit

DDRC Bit

PTC Bit

I/O Pin Mode

Accesses to DDRC

Accesses to PTC

Read/Write

Read

Write

X(1)

Input, VDD

(4)

DDRC1–DDRC0

PTC1–PTC0(3)

Input, Hi-Z(2)

DDRC1–DDRC0

PTC1–PTC0(3)

Output

DDRC1–DDRC0

PTC1–PTC0

Notes:

1. X = Don’t care

2. Hi-Z = High impedance

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

4. I/O pin pulled up to VDD by internal pullup device.

Freescale Semiconductor, Inc.

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