101
4.2.5
CS
Assertion Period Control Registers (CSACRH, CSACRL)
CSACRH
Bit
7
6
5
4
3
2
1
0
CSXH7
CSXH6
CSXH5
CSXH4
CSXH3
CSXH2
CSXH1
CSXH0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
CSACRL
Bit
7
6
5
4
3
2
1
0
CSXT7
CSXT6
CSXT5
CSXT4
CSXT3
CSXT2
CSXT1
CSXT0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
CSACRH and CSACRL are 8-bit readable/writable registers that specify whether or not the
assertion period of the basic bus interface chip select signals (
CSn
) and address signals is to be
extended.
Extending the assertion period of the
CSn
and address signals allows flexible interfacing to
external I/O devices.
CSACRH and CSACRL are initialized to H'0000 by a reset and in hardware standby mode. They
are not initialized in software standby mode.
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