263
Bus and Memory Control (BCU, MEMC)
Chapter 7
Preliminary User’s Manual U17566EE1V2UM00
(2)
VSWC - Internal peripheral function wait control register
The 8-bit VSWC register defines the wait states inserted when accessing
peripheral special function registers via the internal bus. Both address setup
and data wait states are based on the system clock.
Access
This register can be read/written in 8-bit or 1-bit units.
Address
FFFF F06E
H
Initial Value
77
H
7
6
5
4
3
2
1
0
0
SUWL2
SUWL1
SUWL0
0
VSWL2
VSWL1
VSWL0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Table 7-9
VSWC register contents
Bit position
Bit name
Function
6 to 4
SUWL[2:0]
Address setup wait for internal bus:
SUWL2
SUWL1
SUWL0
Number of address setup wait states
0
0
0
0
0
0
1
1 CPU system clock (VBCLK)
0
1
0
2 CPU system clock (VBCLK)
0
1
1
3 CPU system clock (VBCLK)
1
0
0
4 CPU system clock (VBCLK)
1
0
1
5 CPU system clock (VBCLK)
1
1
0
6 CPU system clock (VBCLK)
1
1
1
7 CPU system clock (VBCLK)
2 to 0
VSWL[2:0]
Data wait for internal bus:
VSWL2
VSWL1
VSWL0
Number of data wait states
0
0
0
0
0
0
1
1 CPU system clock (VBCLK)
0
1
0
2 CPU system clock (VBCLK)
0
1
1
3 CPU system clock (VBCLK)
1
0
0
4 CPU system clock (VBCLK)
1
0
1
5 CPU system clock (VBCLK)
1
1
0
6 CPU system clock (VBCLK)
1
1
1
7 CPU system clock (VBCLK)
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