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BR25H160-WE2 Datasheet(PDF) 10 Page - Rohm |
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BR25H160-WE2 Datasheet(HTML) 10 Page - Rohm |
10 / 17 page 10/16 ● At standby ○ Current at standby Set CSB “H”, and be sure to set SCK, SI, WPB, HOLDB input “L” or “H”. Do not input intermediate electric potantial. ○ Timing 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 valid area 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. ● 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. 0 1 2 Command start here. SI is read. Even if CSB is fallen at SCK=SI=”H”, SI status is not read at that edge. CSB SCK SI Fig.43 Operating timing 15 16 Ope code Data tE/W data write time WPB cancel invalid area WPB cancel invalid area invalid WPB cancel invalid area SCK CSB Ope code Address tE/W data write time WPB cancel invalid area WPB cancel invalid area Data WPB cancel invalid area invalid valid Fig.44 WPB valid timing (WRSR) Fig.45 WPB valid timing (WRITE) |
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