
CHAPTER 6 DMA FUNCTIONS (DMA CONTROLLER)
User’s Manual U12688EJ4V0UM00
174
6.3.9 Flyby transfer data wait control register (FDW)
To prevent illegal writing during flyby transfer, this register sets the insertion of wait states (TF) for securing the
time from when the write signal (IOWR, UWR, LWR, WE) becomes inactive until the read signal (RD, IORD, OE)
becomes inactive. This register can be read/written in 8- or 1-bit units.
0
FDW0
Address
FFFFF06CH
After reset
00H
1
FDW1
2
FDW2
3
FDW3
4
FDW4
5
FDW5
6
FDW6
7
FDW7
0
1
2
3
4
5
6
7
FDW
Memory Block
Bit Position
Bit Name
Function
7 to 0
FDWn
(n = 7 to 0)
Flyby Data Wait
Sets wait state insertion for memory block n.
0: Wait state not inserted.
1: Wait state inserted.
Caution Write to the FDW register after reset, and then do not change the value. Also, do not access an
external memory area until the initial setting of the FDW register is complete. (However, the
memory area 0000000H to 01FFFFFH is excluded.)
Remark
Setting of the FDW register is valid during the DMA transfers shown below.
Type of Memory
Object of Transfer
SRAM, Page ROM
DRAM
Memory
→
I/O
Valid
Valid
I/O
→
Memory
Valid
Invalid
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