Z86L78 datasheet(2/59 Pages) ZILOG

2 / 59 page

Z86L78

IR/Low-Voltage Microcontroller

Zilog

2-2

DS97LVO0701

GENERAL DESCRIPTION (Continued)

The Register File is composed of 256 bytes of RAM, and it

includes four I/O port registers, 16 control and status reg-

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

tended Data RAM adds 256 bytes of usable general-pur-

pose registers. The Expanded Register File consists of

two additional register groups (F and D).

To unburden the system from coping with real-time tasks,

such as generating complex waveforms or receiving and

demodulating complex waveform/pulses, the Z86L78 of-

fers an innovative intelligent counter/timer architecture

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

the Z86L78 features a large number of user-selectable

modes, and two on-board comparators to process analog

signals with separate reference voltages (Figure 2).

Notes: Signals with a preceding front slash, "/", are active

Low, for example, 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/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

Z86L78 Datasheet(PDF) 2 Page - Zilog, Inc.

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