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BR25S320FVT-WE2 Datasheet(PDF) 10 Page - Rohm |
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BR25S320FVT-WE2 Datasheet(HTML) 10 Page - Rohm |
10 / 19 page Technical Note 10/18 BR25S□□□ Series www.rohm.com 2010.12 - Rev.B © 2010 ROHM Co., Ltd. All rights reserved. ●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, pay attention to the following WPB valid timing. While write status register command is executed, by setting WPB = “L” in cancel valid area, command can be cancelled. The area from command ope code to CSB rise at internal automatic write start becomes the cancel valid area. However, once write is started, by any input write cycle 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 command communications are carried out when the HOLDB pin 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, keep CSB LOW. When it is set CSB=HIGH in HOLD status, the IC is reset, therefore communication after that cannot be restarted. Fig.39 WPB valid timing (At inputting WRSR command) 6 7 Ope Code Data tE/W Data write time SCK 15 16 Valid (WRSR command is reset by WPB=L) Invalid |
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