Z8F021ASH020SC datasheet(28/276 Pages) ZILOG

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PS022815-0206

Pin Description

Z8 Encore! XP® 4K Series

Product Specification

Signal Descriptions

Table 3 describes the Z8 Encore! XP® 4K Series signals. Refer to the section Pin Configu-

rations on page 7 to determine the signals available for the specific package styles.

Table 3. Signal Descriptions

Signal Mnemonic

I/O

Description

General-Purpose I/O Ports A–D

PA[7:0]

I/O

Port A. These pins are used for general-purpose I/O.

PB[7:0]

I/O

Port B. These pins are used for general-purpose I/O. PB6 and PB7 are

available only in those devices without an ADC.

PC[7:0]

I/O

Port C. These pins are used for general-purpose I/O.

PD[0]

I/O

Port D. This pin is used for general-purpose output only.

Note: PB6 and PB7 are only available in 28-pin packages without ADC. In 28-pin packages with ADC,

they are replaced by AVDD and AVSS.

UART Controllers

TXD0

Transmit Data. This signal is the transmit output from the UART and IrDA.

RXD0

Receive Data. This signal is the receive input for the UART and IrDA.

CTS0

Clear To Send. This signal is the flow control input for the UART.

Driver Enable. This signal allows automatic control of external RS-485

drivers. This signal is approximately the inverse of the TXE (Transmit

Empty) bit in the UART Status 0 register. The DE signal may be used to

ensure the external RS-485 driver is enabled when data is transmitted by

the UART.

Timers

T0OUT/T1OUT

Timer Output 0–1. These signals are outputs from the timers.

T0OUT/T1OUT

Timer Complement Output 0–1. These signals are output from the timers

in PWM Dual Output mode.

T0IN/T1IN

Timer Input 0–1. These signals are used as the capture, gating and

counter inputs.

Comparator

CINP/CINN

Comparator Inputs. These signals are the positive and negative inputs to

the comparator.

COUT

Comparator Output.

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