ZUSBOPTSC01ZACG datasheet(68/282 Pages) ZILOG

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PS022827-1212

P R E L I M I N A R Y

GPIO Control Register Definitions

Z8 Encore! XP® F082A Series

Product Specification

Port A–D Alternate Function Set 2 Subregisters

The Port A–D Alternate Function Set 2 Subregister, shown in Table 28, is accessed

through the Port A–D Control Register by writing 08H to the Port A–D Address Register.

The Alternate Function Set 2 subregisters selects the alternate function available at a port

pin. Alternate Functions selected by setting or clearing bits of this register is defined in

Table 16 on page 43.

Alternate function selection on the port pins must also be enabled. See the Port A–D Alter-

nate Function Subregisters section on page 47 for details.

Table 27. Port A–D Alternate Function Set 1 Subregisters (PxAFS1)

Bit

Field

PAFS17

PAFS16

PAFS15

PAFS14

PAFS13

PAFS12

PAFS11

PAFS10

RESET

00000000

R/W

R/WR/W

R/WR/WR/WR/WR/WR/W

Address

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

Bit

Description

[7:0]



PAFSx

Port Alternate Function Set 1

0 = Port Alternate Function selected, as defined in Tables 15 and 16 on page 43.

1 = Port Alternate Function selected, as defined in Tables 15 and 16 on page 43.

Note: x indicates the specific GPIO port pin number (7–0).

Table 28. Port A–D Alternate Function Set 2 Subregisters (PxAFS2)

Bit

Field

PAFS27

PAFS26

PAFS25

PAFS24

PAFS23

PAFS22

PAFS21

PAFS20

RESET

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

R/W

R/WR/W

R/WR/WR/WR/WR/WR/W

Address

If 08H in Port A–D Address Register, accessible through the Port A–D Control Register

Bit

Description

[7]



PAFS2x

Port Alternate Function Set 2

0 = Port Alternate Function selected, as defined in Table 16.

1 = Port Alternate Function selected, as defined in Table 16.

Note: x indicates the specific GPIO port pin number (7–0).

Note:

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