Z86L79 Datasheet, PDF (2/58 Pages) Zilog, Inc. – Low-Voltage Microcontroller

Z86L79/80
Low-Voltage Microcontroller
GENERAL DESCRIPTION (Continued)
Z8^® applications demand powerful I/O capabilities. The
Z86L79/80 fulfills this with two package options with 24
pins of dedicated input and output. These lines are
grouped into three ports. Each port consists of eight lines
and is configurable under software control to provide tim-
ing, status signals, and parallel I/O.
There are three basic address spaces available to support
a wide range of configurations: Program Memory, Register
File, and Expanded Register File. The Register File is
composed of 256 bytes of RAM. It includes four I/O port
registers, ten control and status registers, and the rest are
general purpose registers. The Expanded Register File
consists of three register groups.
To unburden the program from coping with such real-time
problems as generating complex waveforms or receiving
and demodulating complex waveform/pulses, the Z86L7X
family offers a new intelligent counter/timer architecture
Zilog
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
V_CC
GND
Device
V_DD
V_SS
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
8
LO8
8
8-Bit
T8
8
TC8H
8
TC8L
And/Or
Logic
Figure 1. Counter/Timer Block Diagram
Timer 16
Timer 8/16
Timer 8
3-2
PRELIMINARY
DS97LVO0601