Zilog Z80180 - Manual (Page 75)

Z8018x
Family MPU User Manual
60
UM005003-0703
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
Value Description
7 – 4 CA7 – 4 R/W CA specifies the start (low) address (on 4KB boundaries)
for the Common Area 1. This also determines the last
address of the Bank Area.
3 – 0 BA3 – 0 R/W BA specifies the start (low) address (on 4KB boundaries)
for the Bank Area. This also determines the last address
of the Common Area 0.