10 port k registers, 1 port k direction register, 2 port k data register – Motorola MC68VZ328 User Manual

Page 204: Port k registers -34, Port k direction register -34, Port k data register -34, Table 14-4, Uart 1 status/control register description -10, Pkdir port k direction register 0x(ff)fff440

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10-34

MC68VZ328 User’s Manual

Programming Model

10.4.10

Port K Registers

Port K is composed of the following 8-bit general-purpose I/O registers:

Port K direction register (PKDIR)

Port K data register (PKDATA)

Port K pull-up/-down enable register (PKPUEN)

Port K select register (PKSEL)

Each signal in the PKDATA register connects to an external pin. As on the other ports, each bit on Port K
is individually configured.

10.4.10.1

Port K Direction Register

The direction register controls the direction (input or output) of the line associated with the PKDATA bit
position. When the data bit is assigned to a dedicated I/O function by the PKSEL register, the DIR bits are
ignored. The settings for the PKDIR register bit positions are shown in Table 10-46.

PKDIR

Port K Direction Register

0x(FF)FFF440

10.4.10.2

Port K Data Register

The settings for the PKDATA register bit positions are shown in Table 10-47 on page 10-35.

BIT 7

6

5

4

3

2

1

BIT 0

DIR7

DIR6

DIR5

DIR4

DIR3

DIR2

DIR1

DIR0

TYPE

rw

rw

rw

rw

rw

rw

rw

rw

RESET

0

0

0

0

0

0

0

0

0x00

Table 10-46. Port K Direction Register Description

Name Description

Setting

DIRx
Bits 7–0

Direction—These bits control the direction of
the pins in an 8-bit system. They reset to 0.

0 = The pins are inputs.
1 = The pins are outputs.

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