Z8F021ASH020SC datasheet(66/276 Pages) ZILOG

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PS022815-0206

General-Purpose I/O

Z8 Encore! XP® 4K Series

Product Specification

PIN[7:0]—Port Input Data

Sampled data from the corresponding port pin input.

0 = Input data is logical 0 (Low).

1 = Input data is logical 1 (High).

Port A–D Output Data Register

The Port A–D Output Data register (Table 29) controls the output data to the pins.

POUT[7:0]—Port Output Data

These bits contain the data to be driven to the port pins. The values are only driven if the

corresponding pin is configured as an output and the pin is not configured for alternate

function operation.

0 = Drive a logical 0 (Low).

1= Drive a logical 1 (High). High value is not driven if the drain has been disabled by set-

ting the corresponding Port Output Control register bit to 1.

LED Drive Enable Register

The LED Drive Enable register (Table 30) activates the controlled current drive. The Port

C pin must first be enabled by setting the Alternate Function register to select the LED

function.

LEDEN[7:0]—LED Drive Enable

These bits determine which Port C pins are connected to an internal current sink.

Table 29. Port A–D Output Data Register (PxOUT)

BITS

FIELD

POUT7

POUT6

POUT5

POUT4

POUT3

POUT2

POUT1

POUT0

RESET

000

R/W

R/WR/W

ADDR

FD3H, FD7H, FDBH, FDFH

Table 30. LED Drive Enable (LEDEN)

BITS

FIELD

LEDEN[7:0]

RESET

000

R/W

R/WR/W

ADDR

F82H

Z8F021ASH020SC 数据表(PDF) 66 Page - Zilog, Inc.

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