Z86C21 View Datasheet(PDF) - Zilog

Part Name

Description

Manufacturer

Z86C21

8K ROM Z8® CMOS MICROCONTROLLER

Zilog 

GENERAL DESCRIPTION (Continued)

Z86C21 MCU

WITH 8K ROM

To unburden the program from coping with the real-time

tasks, such as counting/timing and serial data communi-

cation, the Z86C21 offers two on-chip counter/timers with

a large number of user selectable modes, and an on-board

UART.

Notes:

All Signals with a preceding front slash, "/", are active Low, e.g.,

B//W (WORD is active Low); /B/W (BYTE is active Low, only).

Power connections follow conventional descriptions below:

Connection

Circuit

Device

Power

VCC

VDD

Ground

GND

VSS

Output Input

Vcc GND

XTAL /AS /DS R//W /RESET

Port 3

UART

Counter/

Timers

(2)

Interrupt

Control

ALU

FLAGS

Register

Pointer

Register File

256 x 8-Bit

Machine Timing and

Instruction Control

Prg. Memory

8192 x 8-Bit

Program

Counter

Port 2

Port 0

Port 1

I/O

(Bit Programmable)

4

4

Address or I/O

(Nibble Programmable)

8

Address/Data or I/O

(Byte Programmable)

Figure 1. Z86C21 Functional Block Diagram

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