PC87591L datasheet(114/437 Pages) NSC

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Embedded Controller Modules (Continued)

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Revision 1.07

4.5.1

Features

●

General-Purpose Input/Output (GPIO) Port (Px).

— Each pin functions as input or output signal.

— Direction register controls the port direction.

— Weak pull-up.

— Read-back on all registers.

●

General-Purpose Input (GPI) Port (Py).

— All port pins function as input signals.

— Weak pull-up.

— Read-back on all control registers.

●

General-Purpose Output (GPO) Port (Pz).

— All pins function as output signals.

— Read-back on all registers.

●

General-Purpose Input/Output (GPIO) Port (Pw).

— DEV environment support.

— Pins shared with DEV environment signals.

— Off-chip implementation supported in DEV environments.

— Binary and cycle-by-cycle compatibility between environments.

— Each pin functions as input or output signal.

— Direction register controls the port direction.

— Read-back on all registers.

●

Each I/O pin can be conﬁgured as a GPIO port or as an alternate function.

— Some I/O or input pins can provide interrupt functions.

4.5.2

GPIO Port Px

Bidirectional Port with Alternate Function

The GPIO port enables access to input and output pins. It also controls the pin usage either as an I/O port or in its alternate

function. Figure 33 illustrates this functionality.

Direction

Data Output

{

Direction

{

Weak Pull-Up

Data Input Register

Data Out

Alt Device Data

Alt

Alt Device Direction

Alt

Alt Device Data Input

Data Input Read

Pull-Up

Weak Pull-Up

Alternate

Function

{

PxAlt

(PxWPU)

(PxDIR)

(PxDOUT)

PxDIN

Alt

Figure 33. GPIO Port Px Schematic Diagram

{

Output

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