Rev. 3.0, 04/02, page 342 of 1064
13.2.7
Wait Control Register 3 (WCR3)
Wait control register 3 (WCR3) is a 32-bit readable/writable register that specifies the cycles
inserted in the setup time from the address until assertion of the write strobe, and the data hold
time from negation of the strobe, for each area. This enables low-speed memory to be connected
without using external circuitry.
WCR3 is initialized to H'07777777 by a power-on reset, but is not initialized by a manual reset or
in standby mode.
Bit:
31
30
29
28
27
26
25
24
—
—
—
—
—
A6S0
A6H1
A6H0
Initial value:
0
0
0
0
0
1
1
1
R/W:
R
R
R
R
R
R/W
R/W
R/W
Bit:
23
22
21
20
19
18
17
16
—
A5S0
A5H1
A5H0
A4RDH*
A4S0
A4H1
A4H0
Initial value:
0
1
1
1
0
1
1
1
R/W:
R
R/W
R/W
R/W
R/W*
R/W
R/W
R/W
Bit:
15
14
13
12
11
10
9
8
Bit name:
—
A3S0
A3H1
A3H0
—
A2S0
A2H1
A2H0
Initial value:
0
1
1
1
0
1
1
1
R/W:
R
R/W
R/W
R/W
R
R/W
R/W
R/W
Bit:
7
6
5
4
3
2
1
0
A1RDH*
A1S0
A1H1
A0H0
—
A0S0
A0H1
A0H0
Initial value:
0
1
1
1
0
1
1
1
R/W:
R/W*
R/W
R/W
R/W
R
R/W
R/W
R/W
Note: * These bits can be set only in the SH7751R.
Bits 31 to 27, 23, 19*, 15, 11, 7*, and 3 (SH7751)
Bits 31 to 27, 23, 15, 11, and 3 (SH7751R)
Reserved: These bits are always read as 0, and should only be written with 0.
Note: * These bits can be set only in the SH7751R.
Summary of Contents for SH7751
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