BR25H010-W ROHM [Rohm], BR25H010-W Datasheet - Page 10

• Manufacturer Part Number: BR25H010-W
• Manufacturer: ROHM [Rohm]

●At standby
●WPB cancel valid area
●HOLDB pin
By HOLDB pin, command communication can be stopped temporarily. (HOLD status) The HOLDB pin carries out command
communications normally when it is HIGH. To get in HOLD status, at command communication, when SCK=LOW, set the
HOLDB 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 HOLDB 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 CSB LOW. When it is set CSB=HIGH in HOLD status,
the IC is reset, therefore communication after that cannot be restarted.
○Current at standby
○Timing
WPB is normally fixed to “H” or “L” for use, but when WPB is controlled so as to cancel write status register command and write
command, pay attention to the following WPB valid timing.
While write or write status register command is executed, by setting WPB = “L” in cancel valid area, command can be
cancelled. The area from command ope code before CSB rise at internal automatic write start becomes the cancel valid area.
However, once write is started, any input cannot be cancelled. WPB input becomes Don’t Care, and cancellation becomes
invalid.
Set CSB “H”, and be sure to set SCK, SI, WPB, HOLDB input “L” or “H”. Do not input intermediate electric potantial.
As shown in Fig.43, at standby, when SCK is “H”, even if CSB is fallen, SI status is not read at fall edge. SI status is read at
SCK rise edge after fall of CSB. At standby and at power ON/OFF, set CSB “H” status.
WPB cancel invalid area
WPB cancel invalid area
Ope code
CSB
SCK
invalid
SI
Ope code
invalid
Fig.44 WPB valid timing (WRSR)
Fig.45 WPB valid timing (WRITE)
Fig.43 Operating timing
Address
WPB cancel invalid area
Even if CSB is fallen at SCK=SI=”H”,
SI status is not read at that edge.
SCK
CSB
WPB cancel invalid area
0
valid
Command start here. SI is read.
Data
Data
1
15
10/16
WPB cancel invalid area
2
WPB cancel invalid area
data write time
data write time
16
tE/W
tE/W