ZUSBOPTSC01ZACG datasheet(28/282 Pages) ZILOG

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PS022827-1212

P R E L I M I N A R Y

Signal Descriptions

Z8 Encore! XP® F082A Series

Product Specification

Analog

ANA[7:0]

Analog Port. These signals are used as inputs to the analog-to-digital con-

verter (ADC).

VREF

I/O

Analog-to-digital converter reference voltage input, or buffered output for

internal reference.

Low-Power Operational Amplifier (LPO)

AMPINP/AMPINN

LPO inputs. If enabled, these pins drive the positive and negative amplifier

inputs respectively.

AMPOUT

LPO output. If enabled, this pin is driven by the on-chip LPO.

Oscillators

XIN

External Crystal Input. This is the input pin to the crystal oscillator. A crystal

can be connected between it and the XOUT pin to form the oscillator. In

addition, this pin is used with external RC networks or external clock driv-

ers to provide the system clock.

XOUT

External Crystal Output. This pin is the output of the crystal oscillator. A

crystal can be connected between it and the XIN pin to form the oscillator.

Clock Input

CLKIN

Clock Input Signal. This pin may be used to input a TTL-level signal to be

used as the system clock.

LED Drivers

LED

Direct LED drive capability. All port C pins have the capability to drive an

LED without any other external components. These pins have programma-

ble drive strengths set by the GPIO block.

On-Chip Debugger

DBG

I/O

Debug. This signal is the control and data input and output to and from the

On-Chip Debugger.



Caution: The DBG pin is open-drain and requires a pull-up resistor to

ensure proper operation.

Table 2. Signal Descriptions (Continued)

Signal Mnemonic

I/O

Description

Notes:

1. 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.

2. The AVDD and AVSS signals are available only in 28-pin packages with ADC. They are replaced by PB6 and PB7

on 28-pin packages without ADC.

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