Z8F021ASH020SC datasheet(64/276 Pages) ZILOG

64 / 276 page

PS022815-0206

General-Purpose I/O

Z8 Encore! XP® 4K Series

Product Specification

pin during STOP mode do not initiate STOP Mode Recovery.

1 = The Port pin is configured as a STOP Mode Recovery source. Any logic transition on

this pin during STOP mode initiates STOP Mode Recovery.

Port A–D Pull-up Enable Sub-Registers

The Port A–D Pull-up Enable sub-register (Table 25) is accessed through the Port A–D

Control register by writing 06H to the Port A–D Address register. Setting the bits in the

Port A–D Pull-up Enable sub-registers enables a weak internal resistive pull-up on the

specified Port pins.

PPUE[7:0]—Port Pull-up Enabled

0 = The weak pull-up on the Port pin is disabled.

1 = The weak pull-up on the Port pin is enabled.

Port A–D Alternate Function Set 1 Sub-Registers

The Port A–D Alternate Function Set1 sub-register (Table 26) is accessed through the Port

A–D Control register by writing 07H to the Port A–D Address register. The Alternate

Function Set 1 sub-registers selects the alternate function available at a port pin. Alternate

Functions selected by setting or clearing bits of this register are defined in GPIO Alternate

Functions on page 33.

Alternate function selection on port pins must also be enabled as decribed in Port A–D

Alternate Function Sub-Registers on page 42.

PAFS1[7:0]—Port Alternate Function Set 1

0 = Port Alternate Function selected as defined in Tables 15 and 16 in the GPIO Alternate

Table 25. Port A–D Pull-Up Enable Sub-Registers (PxPUE)

BITS

FIELD

PPUE7

PPUE6

PPUE5

PPUE4

PPUE3

PPUE2

PPUE1

PPUE0

RESET

000

R/W

R/WR/W

ADDR

If 06H in Port A

–D Address Register, accessible through the Port A–D Control Register

Table 26. Port A–D Alternate Function Set 1 Sub-Registers (PxAFS1)

BITS

FIELD

PAFS17

PAFS16

PAFS15

PAFS14

PAFS13

PAFS12

PAFS11

PAFS10

RESET

00H (all ports of 20/28 pin devices); 04H (Port A of 8-pin device)

R/W

R/WR/W

ADDR

If 07H in Port A–D Address Register, accessible through the Port A–D Control Register

Note:

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