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BU9832GUL-W (8Kbit)
Datasheet
● At standby
○ Current at standby
Set CS “H”, and be sure to set SCK, SI, WP , HOLD input “L” or “H”. Do not input intermediate electric potantial.
○ Timing
As shown in Figure 39, at standby, when SCK is “H”, even if CS is fallen, SI status is not read at fall edge. SI status is
read at SCK rise edge after fall of CS . At standby and at power ON/OFF, set CS “H” status.
―――
Even if CS is fallen at SCK=SI=”H”,
SI status is not read at that edge.
―――
CS
Command start here. SI is read.
SCK
0
1
2
SI
Figure 39. Operating timing
―――
● WP cancel valid area
WP is normally fixed to “H” or “L” for use, but when WP is controlled so as to cancel write status register command and
write command, pay attention to the following WP valid timing.
While write or write status register command is executed, by setting WP = “L” in cancel valid area, command can be
cancelled. The area from command ope code before CS rise at internal automatic write start becomes the cancel valid
area. However, once write is started, any input cannot be cancelled. WP input becomes Don’t Care, and cancellation
becomes invalid.
SCK
CS
15
16
Ope Code
W P cancel invalid area
Data
tE/W
Data write time
W P cancel invalid area
Figure 40. WP valid timing (WRSR)
O pe Code
A d d res s
WP cancel invalid area
D a ta
tE /W
D a ta wr it e tim e
WP cancel invalid area
Figure 41. WP valid timing (WRITE)
―――――
● HOLD pin
By HOLD pin, command communication can be stopped temporarily (HOLD status). The HOLD pin carries out
command communications normally when it is HIGH. To get in HOLD status, at command communication, when SCK=LOW,
set the HOLD pin LOW. At HOLD status, SCK and SI become Don’t Care, and SO becomes high impedance (High-Z). To
release the HOLD status, set the HOLD pin HIGH when SCK=LOW. After that, communication can be restarted from the
point before the HOLD status. For example, when HOLD status is made after A5 address input at read, after release of
HOLD status, by starting A4 address input, read can be restarted. When in HOLD status, leave CS LOW. When it is set
CS =HIGH in HOLD status, the IC is reset, therefore communication after that cannot be restarted.
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? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
18/26
TSZ02201-0R2R0G100410-1-2
30.AUG.2012 Rev.001
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