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Bit
Bit Name
Initial
Value
R/W
Description
0
ADMXE
0
R/W
Address and Data Multiplex Bus Interface Enable
Selects the type of external extended bus interface.
0: Normal extended bus interface
1: Address and data multiplex extended bus interface
6.3.2
Area Control Register (BCRA)
BCRA designates the access mode in area 1 to area 3. The basic area indicates the setting of area
1.
Bit
Bit Name
Initial
Value
R/W
Description
7
ABWn
1
R/W
Area Bus Width Control
Selects the bus width for area n.
0: 16-bit
1: 8-bit
6
ASTn
1
R/W
Area Access State Control
Designates the number of access states in area n.
Simultaneously permits or prohibits wait state insertion.
Normal extension (ADMXE = 0):
0: 2-state access area, wait state insertion prohibited
1: 3-state access area, wait state insertion permitted
Multiplex extension (ADMXE = 1):
0: Data 2-state access area, wait state insertion
prohibited
1: Data 3-state access area, wait state insertion
permitted
5
PNCCSn
0
R/W
Chip Select Polarity Control
Controls the output polarity of the chip select signal
(
CSn
) for area n.
0:
CSn
output
1: CSn output
Summary of Contents for H8S/2437
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