Wait Control Register 3 (Wcr3) - Hitachi SH7751 Hardware Manual

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
—
Initial value: 0
R/W: R
Bit: 23
—
Initial value: 0
R/W: R
Bit: 15
Bit name: —
Initial value: 0
R/W: R
Bit: 7
A1RDH*
Initial value: 0
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.
Rev. 3.0, 04/02, page 342 of 1064
30 29
— —
0 0
R R
22 21
A5S0 A5H1 A5H0
1 1
R/W R/W
14 13
A3S0 A3H1 A3H0
1 1
R/W R/W
6 5
A1S0 A1H1 A0H0
1 1
R/W R/W
28 27
— — A6S0
0 0
R R
20 19
A4RDH* A4S0
1 0
R/W R/W*
12 11
— A2S0
1 0
R/W R
4 3
— A0S0
1 0
R/W R
26 25
A6H1 A6H0
1 1
R/W R/W R/W
18 17
A4H1 A4H0
1 1
R/W R/W R/W
10 9
A2H1 A2H0
1 1
R/W R/W R/W
2 1
A0H1 A0H0
1 1
R/W R/W R/W
24
1
16
1
8
1
0
1