Z8F021ASH020SC datasheet(59/276 Pages) ZILOG

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PS022815-0206

General-Purpose I/O

Z8 Encore! XP® 4K Series

Product Specification

GPIO Interrupts

Many of the GPIO port pins can be used as interrupt sources. Some port pins can be con-

figured to generate an interrupt request on either the rising edge or falling edge of the pin

input signal. Other port pin interrupt sources generate an interrupt when any edge occurs

(both rising and falling). Refer to the chapter Interrupt Controller on page 50 for more

information about interrupts using the GPIO pins.

GPIO Control Register Definitions

Four registers for each Port provide access to GPIO control, input data, and output data.

Table 17 lists these Port registers. Use the Port A–D Address and Control registers

together to provide access to sub-registers for Port configuration and control.

Port A

(Cont)

Reserved

AFS2[5]: 1

AFS1[5]: 0

Analog Functions* ADC/Comparator Input (P) LPO

Output

AFS2[5]: 1

AFS1[5]: 1

Table 17. GPIO Port Registers and Sub-Registers

Port Register Mnemonic

Port Register Name

PxADDR

Port A–D Address Register

(Selects sub-registers)

PxCTL

Port A–D Control Register

(Provides access to sub-registers)

PxIN

Port A–D Input Data Register

PxOUT

Port A–D Output Data Register

Port Sub-Register Mnemonic

Port Register Name

PxDD

Data Direction

PxAF

Alternate Function

Table 16. Port Alternate Function Mapping (8-Pin Parts) (Continued)

Port

Mnemonic

Alternate Function Description

Alternate

Function Select

Alternate

Function Select

* Analog Functions include ADC inputs, ADC reference, comparator inputs and LPO ports.

Note: Also, alternate function selection as described in

Port A–D Alternate Function Sub-Registers on page 42

must be enabled.

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