Z80180 Datasheet, PDF (75/326 Pages) Zilog, Inc. – Z8018x Family MPU

Z 8018x Fam ily
M PU Us e r M anual
60
MMU Register Description
MMU Common/Bank Area Register (CBAR)
CBAR specifies boundaries within the Z8X180 64KB logical address
space for up to three areas; Common Area 0, Bank Area and Common
Area 1.
MMU Common/Bank Area Register (CBAR: 3AH)
Bit
7
6
5
4
3
2
1
0
Bit/Field
CA3 CA2 CA1 CA0 BA3 BA2 BA1 BA0
R/W
R/W R/W R/W R/W R/W R/W R/W R/W
Reset
1
1
1
1
0
0
0
0
Note: R = Read W = Write X = Indeterminate ? = Not Applicable
Bit
Position Bit/Field R/W
7–4
CA7–4 R/W
3–0
BA3–0 R/W
Value Description
CA specifies the start (low) address (on 4KB boundaries)
for the Common Area 1. This also determines the last
address of the Bank Area.
BA specifies the start (low) address (on 4KB boundaries)
for the Bank Area. This also determines the last address
of the Common Area 0.
UM005001-ZMP0400