ZiLOG Z8 Technical Manual

2.1 INTRODUCTION
The Z8 is a versatile single-chip microcomputer.
Because its multiplexed address/data bus is merged
with
several I/O-oriented ports, the Z8 can func-
tion as either an I/O-intensive or a memory-
intensive microcomputer. One key advantage to
this organization is that external memory can be
addressed while maintaining many of the I/O
lines. Figure 2-1 shows the Z8 block diagram.
2.2 ADDRESS SPACES
To provide for both I/O-intensive and memory-
intensive applications, the Z8 supports three
basic address spaces:
OUTPUT INPUT Vee GND
Chapter 2
Architectural Overview
• Program memory (internal and external)
• Data memory (external)
• Register file (internal)
A maximum of 64K bytes of program memory are
directly addressable. In the Z8601 and Z8611
microcomputers, internal program memory consists
of a mask-programmed ROM. The size of this
internal ROM is 2K bytes for the Z8601 and 4K
bytes for the Z8611. In one member of the Z8
family, the Z8681, all of the program memory is
externally addressable.
Data memory space is always external to the Z8
microcomputer and is 62K bytes in size for the
Z8601 and Z8682, and 60K and 64K bytes in size
respectively for the Z8611 and Z8681.
~/L---!_! _,~-----.,
UART
TIMERI
COUNTERS
(2)
INTERRUPT
CONTROL
PORT
2
!ttttl!!
1/0
(BIT PROGRAMMABLE)
r-=I
~
REG. POINTER
ADDRESS OR 1/0
(NIBBLE PROGRAMMABLE)
Figure 2-1. Z8 Block Diagram
ADDRESSIDATA OR 1/0
(BYTE PROGRAMMABLE)
2037 -003 2-1

ZiLOG Z8 Specifications

General

Brand	ZiLOG
Model	Z8
Category	Desktop
Language	English