Zilog Z80180 Bedienungsanleitung PDF herunterladen (Seite 75)

100

101

Z8018x

Family MPU User Manual

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 76543210

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 0000

Note: R = Read W = Write X = Indeterminate ? = Not Applicable

Bit

Position Bit/Field R/W Value Description

–4CA7–4 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.

–0BA3–0 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.

1 2 ... 70 71 72 73 74 75 76 77 78 79 80 ... 325 326

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