z80189 ZiLOG Semiconductor, z80189 Datasheet - Page 75

• Manufacturer Part Number: z80189
• Description: Z80180, Z8s180, Z8l180 Mpu Operation
• Manufacturer: ZiLOG Semiconductor

60
MMU Common/Bank Area Register (CBAR: 3AH)
UM005003-0703
Bit
Bit/Field
R/W
Reset
Note: R = Read W = Write X = Indeterminate ? = Not Applicable
Bit
Position Bit/Field R/W
7
3
–
–
Z8018x
Family MPU User Manual
4
0
MMU Register Description
CA7
BA3
CA3
R/W
–
–
4
0
7
1
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.
R/W
R/W
CA2
R/W
6
1
Value
CA1
R/W
5
1
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.
CA0
R/W
4
1
BA3
R/W
3
0
BA2
R/W
2
0
BA1
R/W
1
0
BA0
R/W
0
0