BU9831 查看數據表（PDF） - ROHM Semiconductor
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BU9831 Datasheet PDF : 13 Pages
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Memory ICs
(7) Transmission memory data write (TWDW)
H
SK
1
4
8
L
H
CS
L
BU9831 / BU9831F
16
H
DIO
L
1 0 1 0 0 1 0 1 A0
A6
tE/W
Fig. 17 Transmission memory data write
1) This command transmits the wiper position data to the addresses specified by A0 to A6. The data from the seven
bits D8 to D14 of the specified address are stored in the memory during the time tE / W, starting from the rise of the
16th clock.
2) Writing is done to the internal non-volatile memory during the time when this command is input and automatic
writing of the data is completed. Commands input during this time will not be accepted. The maximum time for this
period must be within tE / W.
3) After the write command has been input, if CS is set to LOW after having been set to HIGH, command reception
is enabled following termination of the automatic data writing. Data can then be received from SK and DIO. If CS is
left at LOW following input of the command, however, without being set to HIGH, input of the command is canceled.
(8) INC / DEC
H
SK
L
H
CS
L
H
DIO
L
VW
1
4
8
9
1 0 10 1 1 11
DEC
10
11
INC
t AW
t AW
t AW
Fig. 18 Increment / decrement wiper
1) The wiper position is incremented or decremented starting from the next clock following input of the INC / DEC
command, based on the status of the INC pin.
DIO = H: Incremented. The wiper position moves from the VL to the VH side by 1 tap per clock.
DIO = L: Decremented. The wiper position moves from the VH to the VL side by 1 tap per clock.
2) The tap is moved at each rise of the clock, until CS is set to HIGH.
When the tap is farthest to the VH side, incrementing is ignored.
In the same way, when the tap is farthest to the VL side, decrementing is ignored.
11
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