107
Chapter 3
CPU Function
Preliminary User’s Manual U15839EE1V0UM00
3.6.4 Internal peripheral function wait control register (VSWC)
This register inserts wait states to the internal access of peripheral SFRs.
This register can be read or written in 1-bit and 8-bit units.
Figure 3-20:
Internal peripheral function wait control register (VSWC) Format
Caution:
With respect to the specified operation frequency the following register settings for
VSWC are recommended.
7
6
5
4
3
2
1
0
Address
R/W
Reset
Value
VSWC
0
SUWL2 SUWL1 SUWL0
0
VSWL2
VSWL1
VSWL0
FFFFF06EH
R/W
77H
0
1
1
1
0
1
1
1
Bit Name
Description
SUWL2,
SUWL1,
SUWL0
Setup wait for internal peripheral bus length
SUWL2
SUWL1
SUWL0
Number of data wait states (n = 7 - 0)
0
0
0
0
0
0
1
1 system clock
0
1
0
2 system clock
0
1
1
3 system clock
1
0
0
4 system clock
1
0
1
5 system clock
1
1
0
6 system clock
1
1
1
7 system clock (default)
VSWL2,
VSWL1,
VSWL0
Internal peripheral bus wait length
VSWL2
VSWL1
VSWL0
Number of data wait states (n = 7 - 0)
0
0
0
0
0
0
1
1 system clock
0
1
0
2 system clock
0
1
1
3 system clock
1
0
0
4 system clock
1
0
1
5 system clock
1
1
0
6 system clock
1
1
1
7 system clock (default)
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