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177
•
Bits 7–4—CS1 Space Wait Specification (W13, W12, W11, W10): Specifies the number of
waits for CS1 space access.
Bit 7
(W13)
Bit 6
(W12)
Bit 5
(W11)
Bit 4
(W10)
Description
0
0
0
0
No wait (external wait input disabled)
0
0
0
1
1 wait external wait input enabled
⋅⋅⋅
1
1
1
1
15 wait external wait input enabled
(initial value)
•
Bits 3–0—CS0 Space Wait Specification (W03, W02, W01, W00): Specifies the number of
waits for CS0 space access.
Bit 3
(W03)
Bit 2
(W02)
Bit 1
(W01)
Bit 0
(W00)
Description
0
0
0
0
No wait (external wait input disabled)
0
0
0
1
1 wait external wait input enabled
⋅⋅⋅
1
1
1
1
15 wait external wait input enabled
(initial value)
10.2.4
Wait Control Register 2 (WCR2)
WCR2 is a 16-bit read/write register that specifies the number of access cycles for DRAM space
and CS space for DMA single address mode transfers.
Do not perform any DMA single address transfers before WCR2 is set.
WCR2 is initialized by power-on resets to H'000F, but is not initialized by manual resets or
software standbys.
Bit:
15
14
13
12
11
10
9
8
—
—
—
—
—
—
—
—
Initial value:
0
0
0
0
0
0
0
0
R/W:
R
R
R
R
R
R
R
R
Bit:
7
6
5
4
3
2
1
0
—
—
DDW1
DDW0
DSW3
DSW2
DSW1
DSW0
Initial value:
0
0
0
0
1
1
1
1
R/W:
R
R
R/W
R/W
R/W
R/W
R/W
R/W
Summary of Contents for SH7041 Series
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Page 923: ...SH7040 SH7041 SH7042 SH7043 SH7044 SH7045 Group Hardware Manual REJ09B0044 0600O ...