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5.2 Wait Insertion Function
The BBR is equipped with a wait insertion function for connection with low-speed peripheral macros that are
connected to the NPB. The NPB strobe wait control register (VSWC) is used to set up this function.
The VSWC register sets the setup wait length and VPSTB wait length (see Figure 5-6). The number of waits can
be set in the range from 0 to 7 clocks based on the internal system clock (VBCLK).
The VSWC register can be read or written in 8-bit or 1-bit units.
7
6
VSWC
0
SUWL2
Bit position
Bit name
6 to 4
SUWL2 to
SUWL0
Caution Bits 7 and 3 of the VSWC register must be set to 0. The operation when these bits are set to
1 is not guaranteed.
CHAPTER 5 BBR
Figure 5-6. NPB Strobe Wait Control Register (VSWC) (1/2)
5
4
SUWL1
SUWL0
Sets the setup wait length.
SUWL2
SUWL1
SUWL0
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
Remark
t
: Internal system clock (VBCLK) cycle
CLK
Preliminary User's Manual A14874EJ3V0UM
3
2
1
0
VSWL2
VSWL1
Function
Setup wait length
0 (no waits)
1×t
CLK
2×t
CLK
3×t
CLK
4×t
CLK
5×t
CLK
6×t
CLK
7×t
CLK
0
Address
After reset
VSWL0
FFFFF06EH
77H
123
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