M68ICS08GR datasheet(209/408 Pages) FREESCALE

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Input/Output Ports (I/O)

Port A

MC68HC908GR8 — Rev 4.0

Technical Data

MOTOROLA

Input/Output Ports (I/O)

209

16.3 Port A

Port A is an 4-bit special-function port that shares all four of its pins with

the keyboard interrupt (KBI) module. Port A also has software

configurable pullup devices if configured as an input port.

16.3.1 Port A Data Register

The port A data register (PTA) contains a data latch for each of the four

port A pins.

PTA3–PTA0 — Port A Data Bits

These read/write bits are software programmable. Data direction of

each port A pin is under the control of the corresponding bit in data

direction register A. Reset has no effect on port A data.

KBD3–KBD0 — Keyboard Inputs

The keyboard interrupt enable bits, KBIE3–KBIE0, in the keyboard

interrupt control register (KBICR) enable the port A pins as external

interrupt pins. See Keyboard Interrupt (KBI).

Address:

$0000

Bit 7

654321

Bit 0

Read:

0000

PTA3

PTA2

PTA1

PTA0

Write:

Reset:

Unaffected by reset

Alternate

Function:

KBD3

KBD2

KBD1

KBD0

Figure 16-2. Port A Data Register (PTA)

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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