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Z86E72

OTP IR MICROCONTROLLERS

Zilog 

Z86E72/E73

OTP IR Microcontrollers

GENERAL DESCRIPTION (Continued)

urable under software control to provide timing, status sig-

nals, parallel I/O with or without handshake, and an ad-

dress/data bus for interfacing external memory.

There are five basic address spaces available to support a

wide range of configurations: Program Memory, Register

FIle, Expanded Register File, Extended Data RAM and Ex-

ternal Memory. The register file is composed of 256 bytes

of RAM. It includes four I/O port registers, 16 control and

status registers and the rest are General Purpose regis-

ters. The Extended Data RAM adds 512 (E72) of usable

general-purpose registers. The Expanded Register File

consists of two additional register groups (F and D).

To unburden the program from coping with such real-time

problems as generating complex waveforms or receiving

and demodulating complex waveform/pulses, the Z86E7X

family offers a new intelligent counter/timer architecture

with 8-bit and 16-bit counter/timers (Figure 1). Also includ-

ed are a large number of user-selectable modes, and two

on-board comparators to process analog signals with sep-

arate reference voltages (Figure 2).

Notes: All Signals with a preceding front slash, "/", are ac-

tive Low, e.g., B//W (WORD is active Low); /B/W (BYTE is

active Low, only).

Power connections follow conventional descriptions be-

low:

Connection

Power

Ground

Circuit

VCC

GND

Device

VDD

VSS

HI16

8

LO16

8

1 24 8

SCLK

Clock

Divider

Input Glitch

Filter

Edge

Detect

Circuit

16-Bit

T16

8

TC16H

16

8

TC16L

HI8

LO8

8

8

8-Bit

T8

8

8

TC8H

TC8L

Timer 16

And/Or

Logic

Timer 8/16

Timer 8

Figure 1. Z86E7X Counter/Timer Block Diagram

1-2

PRELIMINARY

DS96LVO1100

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