ZiLOG Z8 Technical Manual

3.5 CPU DATA MEMORY
Up to 64K bytes of external data memory can be
accessed in the ZB microcomputer. As shown in
Figure 3-6, the origin, and hence, the actual size
of data memory is device-dependent. The origin of
data memory is the same as the starting address of
external program memory.
Like external program memory, external data memory
Address/Data lines are provided by Port 1 for
B-bit addresses, and by Ports 0 and 1 for 12-bit
and 16-bit addresses.
External data memory can be included with or sep-
arated from the external program memory addressing
space. When data memory is separated from program
memory, the Data Memory output (OM) is used to
select between data and program memories.
65535 -------------
EXTERNAL
DATA
MEMORY
(62K BYTES)
~g:~~----------------------~
NOT ADDRESSABLE
o~ ______________________ ~
figure 3-6a. 18601 or 18682 Data Memory Map
Address Spaces
65535 ,...----------- ....
EXTERNAL
DATA
MEMORY
(6DK BYTES)
:~~~~------------------------~
NOT ADDRESSABLE
o~ _________________ ~
Figure 3-6b. 18611 Data Memory Map
65535 .... ----------- .....
EXTERNAL
DATA
MEMORY
(64K bytes)
o~ ____________________ ~
Figure 3-6c. 18681 Data Memory Map
2037-005, 2038-005 3-5

ZiLOG Z8 Specifications

General

Brand	ZiLOG
Model	Z8
Category	Desktop
Language	English