Z86L7208FSC datasheet(2/71 Pages) ZILOG

2 / 71 page

Z86C72/C92/L72/L92

IR Microcontroller

Zilog

6-2

P R E L I M I N A R Y

DS97LVO0900

GENERAL DESCRIPTION (Continued)

access to register mapped peripherals, I/O circuits, and

powerful counter/timer circuitry. The Z86C72/C92/L72/L92

offers a flexible I/O scheme, an efficient register and ad-

dress space structure, and a number of ancillary features

that are useful in many consumer, automotive, computer

peripheral, and battery operated hand-held applications.

Many applications demand powerful I/O capabilities. The

Z86LX2/CX2 family fulfills this with three package options

in which the L72 version provides 31 pins of dedicated in-

put and output. These lines are grouped into four ports.

Each port consists of eight lines (Port 3 has seven lines)

and is configurable under software control to provide tim-

ing, status signals, parallel I/O with or without handshake,

and an address/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 bytes 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

Z86LX2/CX2 family offers a new intelligent counter/timer

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

Also included are a large number of user-selectable

modes, and two on-board comparators to process analog

signals with separate reference voltages (Figure 2).

Figure 1. Counter/Timer Block 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

2 48

Timer 16

Timer 8/16

Timer 8

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