SH7011 Datasheet, PDF (89/292 Pages) Renesas Technology Corp – CMOS single-chip microprocessors

7.2.2 Wait Control Register 1 (WCR1)
Wait control register 1 (WCR1) is a 16-bit read/write register that specifies the number of wait
cycles (0-3) for each CS space.
WCR1 is initialized to H'FFFF by power-on resets.
Bit: 15
—
Initial value: 1
R/W: R
14
13
12
11
—
W31 W30
—
1
1
1
1
R
R/W R/W
R
10
9
8
—
W21 W20
1
1
1
R
R/W R/W
Bit: 7
—
Initial value: 1
R/W: R
6
5
4
3
—
W11 W10
—
1
1
1
1
R
R/W R/W
R
2
1
0
—
W01 W00
1
1
1
R
R/W R/W
• Bits 15 and 14—Reserved. These bits always read 1. The write value should always be 1.
• Bits 13 and 12—CS3 Space Wait Specification (W31, W30): These bits specify the number of
waits for CS3 space accesses.
Bit 13 (W31)
0
1
Bit 12 (W30)
0
1
0
1
Description
No wait (external wait input disabled)
1-wait external wait input enabled
2-wait external wait input enabled
3-wait external wait input enabled (initial value)
• Bits 11 and 10—Reserved. These bits always read 1. The write value should always be 1.
• Bits 9 and 8—CS2 Space Wait Specification (W21, W20): These bits specify the number of
waits for CS2 space accesses.
Bit 9 (W21)
0
1
Bit 8 (W20)
0
1
0
1
Description
No wait (external wait input disabled)
1-wait external wait input enabled
2-wait external wait input enabled
3-wait external wait input enabled (initial value)
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