Z86E61 Datasheet, PDF (2/44 Pages) Zilog, Inc. – CMOS Z8 16K/32K EPROM MICROCONTROLLER

PRELIMINARY
GENERAL DESCRIPTION (Continued)
Z86E61/E63 Z8^® MCU
WITH 16K/32K EPROM
There are three basic address spaces available to support
this configuration: Program Memory, Data Memory, and
236 general-purpose registers.
To unburden the system from coping with real-time tasks
such as counting/timing and serial data communication,
the Z86E61/E63 offers two on-chip counter/timers with a
large number of user selectable modes (Figure 1).
Notes:
All Signals with a preceding front slash, "/", are active Low, e.g.,
B//W (WORD is active Low); /B/W (BYTE is active Low, only).
Power connections follow conventional descriptions below:
Connection
Circuit
Device
Power
V_CC
V_DD
Ground
GND
V_SS
Output Input
Vcc GND
XTAL /AS /DS R//W /RESET
Port 3
UART
Counter/
Timers
(2)
Interrupt
Control
ALU
FLAGS
Register
Pointer
Register File
256 x 8-Bit
Machine Timing and
Instruction Control
Prg. Memory
16K/32K
Program
Counter
Port 2
Port 0
Port 1
I/O
(Bit Programmable)
4
4
Address or I/O
(Nibble Programmable)
8
Address/Data or I/O
(Byte Programmable)
Figure 1. Z86E61/E63 Functional Block Diagram
2