h8s-2172 Renesas Electronics Corporation., h8s-2172 Datasheet - Page 120
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h8s-2172
Manufacturer Part Number
h8s-2172
Description
Renesas 16-bit Single-chip Microcomputer H8s Family H8s-2100 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2172.pdf
(570 pages)
- Current page: 120 of 570
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6.3.2
CSACR selects 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.
Rev. 2.00, 03/04, page 88 of 534
Bit
7
6
5
4
3
2
1
0
Bit Name
CSXH3
CSXH2
CSXH1
CSXH0
CSXT3
CSXT2
CSXT1
CSXT0
CS Assertion Period Control Register (CSACR)
Initial
Value
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Description
CS and Address Signal Assertion Period Control 1
These bits specify whether or not the T
inserted (see figure 6.2). When an area for which the
CSXHn bit is set to 1 is accessed, a one-state T
in which only the CSn and address signals are
asserted, is inserted before the normal access cycle.
0: In area n basic bus interface access, the CSn and
1: In area n basic bus interface access, the CSn and
CS and Address Signal Assertion Period Control 2
These bits specify whether or not the T
inserted (see figure 6.2). When an area for which the
CSXTn bit is set to 1 is accessed, a one-state T
in which only the CSn and address signals are
asserted, is inserted before the normal access cycle.
0: In area n basic bus interface access, the CSn and
1: In area n basic bus interface access, the CSn and
address assertion period (T
address assertion period (T
address assertion period (T
address assertion period (T
h
h
t
t
) is not extended
) is extended
) is not extended
) is extended
h
t
cycle is to be
cycle is to be
(n = 3 to 0)
t
h
cycle,
cycle,
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