Rev. 1.00, 09/03, page 94 of 704
6.3 Register
Descriptions
Registers related to the bus controller are as follows.
•
Bus control register (BCR)
•
Basic area/area 1 control register (BCRA1)
•
Area 2 control register (BCRA2)
•
Area 3 control register (BCRA3)
6.3.1
Bus Control Register (BCR)
BCR is used to specify the external extended selection, inversion control of
CS1
to
CS3
,
AS
, and
AH
pins, as well as idle cycle insertion.
Bit
Bit Name
Initial
Value
R/W
Description
7
1
R/(W)
Reserved
The initial value should not be changed.
6
ICIS
1
R/W
Idle Cycle Insert
When external read cycle and external write cycle
continue, it selects whether idle cycle 1-state is inserted
or idle cycle is not inserted.
0: Idle cycle is not inserted
1: Idle cycle 1-state is inserted
5
1
R/(W)
Reserved
The initial value should not be changed.
4
0
R/(W)
Reserved
The initial value should not be changed.
3
0
R/(W)
Reserved
The initial value should not be changed.
2
0
R/(W)
Reserved
The initial value should not be changed.
1
PNCASH
0
R/W
Address Strobe/Hold Polarity Control
Controls output polarity of address strobe signal (
AS
)
and address hold signal (
AH
).
0:
AS
/
AH
output
1:
AS
/
AH
output
Summary of Contents for H8S/2437
Page 2: ...Rev 1 00 09 03 page ii of xxxviii ...
Page 8: ...Rev 1 00 09 03 page viii of xxxviii ...
Page 32: ...Rev 1 00 09 03 page xxxii of xxxviii ...
Page 38: ...Rev 1 00 09 03 page xxxviii of xxxviii ...
Page 168: ...Rev 1 00 09 03 page 130 of 704 ...
Page 336: ...Rev 1 00 09 03 page 298 of 704 ...
Page 402: ...Rev 1 00 09 03 page 364 of 704 ...
Page 454: ...Rev 1 00 09 03 page 416 of 704 ...
Page 512: ...Rev 1 00 09 03 page 474 of 704 ...
Page 562: ...Rev 1 00 09 03 page 524 of 704 ...
Page 648: ...Rev 1 00 09 03 page 610 of 704 ...
Page 672: ...Rev 1 00 09 03 page 634 of 704 ...
Page 732: ...Rev 1 00 09 03 page 694 of 704 ...
Page 742: ...Rev 1 00 09 03 page 704 of 704 ...
Page 745: ......
Page 746: ...H8S 2437 Group Hardware Manual REJ09B0059 0100Z ...