Z86C30 datasheet(19/348 Pages) ZILOG

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Z8 CPU

User Manual

UM001602-0904

Z8 CPU Product Overview

The ZiLOG Z8 microcontroller (MCU) product line continues to expand

with new product introductions. ZiLOG MCU products are targeted for

cost-sensitive, high-volume applications including consumer, automotive,

security, and HVAC. It includes ROM-based products geared for high-

volume production (where software is stable) and one-time programma-

ble (OTP) equivalents for prototyping as well as volume production

where time to market or code ﬂexibility is critical (see Table 1 on page 4).

A variety of packaging options are available including plastic DIP, SOIC,

PLCC, and QFP.

A generalized Z8 CPU® block diagram is shown in Figure 1. The same

on-chip peripherals are used across the MCU product line with the pri-

mary differences being the amount of ROM/RAM, number of I/O lines

present, and packaging/temperature ranges available. This allows code

written for one MCU device to be easily ported to another family mem-

ber.

Key Features

General-Purpose Register File.

Every RAM register acts like an accu-

mulator, speeding instruction execution and maximizing coding efﬁ-

ciency. Working register groups allow fast context switching.

Flexible I/O.

I/O byte, nibble, and/or bit programmable as inputs or out-

puts. Outputs are software programmable as open-drain or push–pull on a

port basis. Inputs are Schmitt-triggered with autolatches to hold unused

inputs at a known voltage state.

Analog Inputs.

Three input pins are software programmable as digital or

analog inputs. When in analog mode, two comparator inputs are provided

with a common reference input. These inputs are ideal for a variety of

common functions, including threshold level detection, analog-to-digital

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