Z8F021ASH020SC datasheet(65/276 Pages) ZILOG

65 / 276 page

PS022815-0206

General-Purpose I/O

Z8 Encore! XP® 4K Series

Product Specification

Functions section.

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

Functions section.

Port A–D Alternate Function Set 2 Sub-Registers

The Port A–D Alternate Function Set 2 sub-register (Table 27) is accessed through the

Port A–D Control register by writing 08H to the Port A–D Address register. The Alternate

Function Set 2 sub-registers 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 in the

section 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.

PAFS2[7:0]—Port Alternate Function Set 2

0 = Port Alternate Function selected as defined in Table 16 GPIO Alternate Functions sec-

tion.

1 = Port Alternate Function selected as defined in Table 16 GPIO Alternate Functions sec-

tion.

Port A–C Input Data Registers

Reading from the Port A–C Input Data registers (Table 28) returns the sampled values

from the corresponding port pins. The Port A–C Input Data registers are read-only. The

value returned for any unused ports is 0. Unused ports include those missing on the 8- and

28-pin packages, as well as those missing on the ADC-enabled 28-pin packages.

Table 27. Port A–D Alternate Function Set 2 Sub-Registers (PxAFS2)

BITS

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

ADDR

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

Table 28. Port A–C Input Data Registers (PxIN)

BITS

FIELD

PIN7

PIN6

PIN5

PIN4

PIN3

PIN2

PIN1

PIN0

RESET

XXX

R/W

RRR

ADDR

FD2H, FD6H, FDAH

Note:

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