L8708H datasheet(2/66 Pages) ZILOG

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Z86L88/81/86/87/89/73

IR/Low-Voltage Microcontroller

P R E L I M I N A R Y

DS96LV00800

GENERAL DESCRIPTION (Continued)

consumer, automotive, computer peripheral, and battery

operated hand-held applications.

There are four basic address spaces available to support

a wide range of configurations: Program Memory, Regis-

ter File, Expanded Register File, and External Memory.

The register file is composed of 256 bytes of RAM. It in-

cludes four I/O port registers, 16 control and status regis-

ters and the rest are General Purpose registers. The Ex-

panded Register File consists of two additional register

groups (F and D). External Memory is not available on 28-

pin versions.

To unburden the program from coping with such real-time

problems as generating complex waveforms or receiving

and demodulating complex waveform/pulses, the Z86LXX

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

Circuit

Device

Power

VCC

VDD

Ground

GND

VSS

Figure 1. Counter/Timers Diagram

HI16

LO16

16-Bit

T16

TC16H

TC16L

HI8

LO8

And/Or

Logic

Clock

Divider

Glitch

Filter

Edge

Detect

Circuit

8-Bit

TC8H

TC8L

Input

SCLK

1 2 48

Timer 16

Timer 8/16

Timer 8

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