Z8F082ASH020SC datasheet(57/244 Pages) ZILOG

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PS024705-0405

P R E L I M I N A R Y

General-Purpose I/O

Z8 Encore! XP® F08xA Series

Product Specification

DD[7:0]—Data Direction

These bits control the direction of the associated port pin. Port Alternate Function opera-

tion overrides the Data Direction register setting.

0 = Output. Data in the Port A–D Output Data register is driven onto the port pin.

1 = Input. The port pin is sampled and the value written into the Port A–D Input Data Reg-

ister. The output driver is tristated.

Port A–D Alternate Function Sub-Registers

The Port A–D Alternate Function sub-register (Table 19) is accessed through the Port A–

D Control register by writing 02H to the Port A–D Address register. The Port A–D Alter-

nate Function sub-registers enable the alternate function selection on pins. If disabled, pins

functions as GPIO. If enabled, select one of four alternate functions using alternate func-

tion set subregisters 1 and 2 as described in the “Port A–D Alternate Function Set 1 Sub-

Registers” on page 42

and “Port A–D Alternate Function Set 2 Sub-Registers” on page 42.

Refer

to the “GPIO Alternate Functions” on page 32 to determine the alternate function asso-

ciated with each port pin.

Do not enable alternate functions for GPIO port pins for which there is no

associated alternate function. Failure to follow this guideline can result in

unpredictable operation.

AF[7:0]—Port Alternate Function enabled

0 = The port pin is in normal mode and the DDx bit in the Port A–D Data Direction sub-

Table 18. Port A–D Data Direction Sub-Registers (PxDD)

BITS

FIELD

DD7

DD6

DD5

DD4

DD3

DD2

DD1

DD0

RESET

111

R/W

R/WR/W

ADDR

If 01H in Port A–D Address Register, accessible through the Port A–D Control Register

Table 19. Port A–D Alternate Function Sub-Registers (PxAF)

BITS

FIELD

AF7

AF6

AF5

AF4

AF3

AF2

AF1

AF0

RESET

00H (Ports A–C); 01H (Port D)

R/W

ADDR

If 02H in Port A–D Address Register, accessible through the Port A–D Control Register

Caution:

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