Z8F021ASH020SC datasheet(67/276 Pages) ZILOG

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PS022815-0206

General-Purpose I/O

Z8 Encore! XP® 4K Series

Product Specification

0 = Tristate the Port C pin.

1= Enable controlled current sink on the Port C pin.

LED Drive Level High Register

The LED Drive Level registers contain two control bits for each Port C pin (Table 31).

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

programmable.

LEDLVLH[7:0]—LED Level High Bit

{LEDLVLH, LEDLVLL} select one of four programmable current drive levels for each

Port C pin.

00 = 3 mA

01= 7 mA

10= 13 mA

11= 20 mA

LED Drive Level Low Register

The LED Drive Level registers contain two control bits for each Port C pin (Table 32).

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

programmable.

LEDLVLH[7:0]—LED Level High Bit

{LEDLVLH, LEDLVLL} select one of four programmable current drive levels for each

Port C pin.

Table 31. LED Drive Level High Register (LEDLVLH)

BITS

FIELD

LEDLVLH[7:0]

RESET

000

R/W

R/WR/W

ADDR

F83H

Table 32. LED Drive Level Low Register (LEDLVLL)

BITS

FIELD

LEDLVLL[7:0]

RESET

000

R/W

R/WR/W

ADDR

F84H

Z8F021ASH020SC 数据表(PDF) 67 Page - Zilog, Inc.

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