Z8F082ASH020SC datasheet(62/244 Pages) ZILOG

62 / 244 page

PS024705-0405

P R E L I M I N A R Y

General-Purpose I/O

Z8 Encore! XP® F08xA Series

Product Specification

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 28) 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.

0 = Tristate the Port C pin.

1= Connect controlled current sink to the Port C pin.

LED Drive Level High Register

The LED Drive Level registers contain two control bits for each Port C pin (Table 29).

These two bits select between four programmable drive levels. Each pin is individually

programmable.

R/W

R/WR/W

ADDR

FD3H, FD7H, FDBH, FDFH

Table 28. LED Drive Enable (LEDEN)

BITS

FIELD

LEDEN[7:0]

RESET

000

R/W

R/WR/W

ADDR

F82H

Table 29. LED Drive Level High Register (LEDLVLH)

BITS

FIELD

LEDLVLH[7:0]

RESET

000

Table 27. Port A–D Output Data Register (PxOUT)

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