ZUSBOPTSC01ZAC datasheet(64/402 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

In each of these three data direction subregisters, bits [7:0] control the direction of the

associated port pin. Port Alternate Function operation overrides the Data Direction Regis-

ter setting.

If the value of the bit is 0, the direction is output, and data in the Port A–C Output Data

registers is driven onto the port pin.

If the value of the bit is 1, the direction is input. The port pin is sampled, the value is writ-

ten into the Port A–C Input Data registers, and the output driver is tristated.

Port A–B Alternate Function 0 Subregisters

The Port A–B Alternate Function subregisters, shown in Table 19, are accessed through

the Port A–B Control registers by writing 02h to the Port A–B Address registers. The Port

A–B Alternate Function subregisters select the alternate functions for the selected pins.

Refer to the GPIO Alternate Functions section on page 36 to determine the alternate func-

tion associated with each port pin.

Do not enable alternate function for GPIO port pins which do not have an associated al-

ternate function. Failure to follow this guideline may result in unpredictable operation.

Table 18. Port A–C Data Direction Sub-Registers

BITS

FIELD

DD7

DD6

DD5

DD4

DD3

DD2

DD1

DD0

RESET

111

R/W

R/WR/W

ADDR

If 01H in Port A–C Address Register, accessible through the Port A-C Control Register

Bit

Position

Value

(H)

Description

[7:0]

Data

Direction

These bits control the direction of the associated port pin. Port Alternate Function

operation overrides the Data Direction register setting.

Output. Data in the Port A–C Output Data register is driven onto the port pin.

Input. The port pin is sampled and the value written into the Port A–C Input Data

Caution:

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