Z86C21 datasheet(2/35 Pages) ZILOG

2 / 35 page

Z86C21 MCU

WITH

8K ROM

GENERAL DESCRIPTION (Continued)

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.

Port 3

UART

Counter/

Timers

(2)

Interrupt

Control

Port 2

I/O

(Bit Programmable)

ALU

FLAGS

Pointer

256 x 8-Bit

Machine Timing and

Instruction Control

Prg. Memory

8192 x 8-Bit

Program

Counter

Vcc

GND

XTAL

Port 0

Output

Input

Address or I/O

(Nibble Programmable)

Port 1

Address/Data or I/O

(Byte Programmable)

/AS /DS R//W /RESET

Figure 1. Z86C21 Functional Block Diagram

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

Ground

GND

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