ZUSBOPTSC01ZAC datasheet(58/402 Pages) ZILOG

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General-Purpose I/O

P R E L I M I N A R Y

PS024604-1005

Z8 Encore!® Motor Control Flash MCUs

Product Specification

GPIO Alternate Functions

Many of the GPIO port pins can be used as both general-purpose I/O and to provide access

to on-chip peripheral functions, such as timers and serial communication devices. The Port

A-C Alternate Function subregisters configure these pins for either general-purpose I/O or

alternate function operation. When a pin is configured for alternate function, control of the

port pin direction (input/output) is passed from the Port A-C Data Direction registers to

the alternate function assigned to this pin. For peripherals with digital input alternate func-

tions (for example, a Timer input T0IN0), selecting the alternate function is not required.

Table 13 lists the alternate functions associated with each port pin and the required alter-

nate function (AF0 and AF1) subregister settings. In general, enabling an analog alternate

Figure 5. GPIO Port Pin Block Diagram

System Clock

Data Bus

Pull-Up Enable

Schmitt Trigger

Port

GND

VDD

Port Input

Data Register

Port Output

Data Register

System Clock

Port Output Control

Port Data Direction

Analog In/Out

On-Chip

Peripheral

Alternate Function

Digital Input

ZUSBOPTSC01ZAC 数据表(PDF) 58 Page - Zilog, Inc.

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