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BR25L040F-WTR Datasheet(PDF) 6 Page - Rohm |
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BR25L040F-WTR Datasheet(HTML) 6 Page - Rohm |
6 / 17 page 6/16 BR25L010-W, BR25L020-W, BR25L040-W, BR25L080-W, BR25L160-W, BR25L320-W, BR25L640-W Technical Note R/B Write cycle status (READY / BUSY) status confirmation bit - bit Memory location Function WPEN EEPROM BP1 BP0 EEPROM WEN Register WP pin enable / disable designation bit EEPROM write disable block designation bit Write and write status register write enable / disable status confirmation bit Register Contents WEN = 0 = prohibited WEN = 1 = permitted WPEN = 0 = invalid WPEN = 1 = valid - - R/B=0=READY R/B=1=BUSY Features Status registers Write disable block setting BR25L010-W BR25L020-W 1 WPEN BR25L040-W BR25L080-W BR25L160-W BR25L320-W BR25L640-W Product number bit 7 1 0 bit 6 1 0 bit 5 1 0 bit 4 BP1 BP1 bit 3 BP0 BP0 bit 2 WEN WEN bit 1 R/B - R/B - bit 0 BP0 None 60h-7Fh 40h-7Fh 00h-7Fh BR25L010-W None C0h-FFh 80h-FFh 00h-FFh BR25L020-W None 180h-1FFh 100h-1FFh 000h-1FFh BR25L040-W None 300h-3FFh 200h-3FFh 000h-3FFh BR25L080-W None 600h-7FFh 400h-7FFh 000h-7FFh BR25L160-W None C00h-FFFh 800h-FFFh 000h-FFFh BR25L320-W None 1800h-1FFFh 1000h-1FFFh 0000h-1FFFh BR25L640-W Write disable block 0 1 0 1 BP1 0 0 1 1 BR25L010-W BR25L020-W Prohibition possible Prohibition possible but WPEN bit "1" BR25L040-W BR25L080-W BR25L160-W BR25L320-W BR25L640-W Product number WRSR Prohibition possible Prohibition impossible WRITE Status registers This IC has status registers. The status registers are of 8 bits and express the following parameters. BP0 and BP1 can be set by write status register command. These 2 bits are memorized into the EEPROM, therefore are valid even when power source is turned off. Rewrite characteristics and data hold time are same as characteristics of the EEPROM. WEN can be set by write enable command and write disable command. WEN becomes write disable status when power source is turned off. R/B is for write confirmation, therefore cannot be set externally. The value of status register can be read by read status command. This enables / disables the functions of WP pin. This designates the write disable area of EEPROM. Write designation areas of product numbers are shown below. WP pin By setting WP = LOW, write command is prohibited. As for BR25L080, 160, 320, 640-W, only when WPEN bit is set "1", the WP pin functions become valid. And the write command to be disabled at this moment is WRSR. As for BR25L010, 020, 040-W, both WRITE and WRSR commands are prohibited. However, when write cycle is in execution, no interruption can be made. HOLD pin By HOLD pin, data transfer can be interrupted. When SCK = "1", by making HOLD from "1" into "0", data transfer to EEPROM is interrupted. When SCK = "0", by making HOLD from "0" into "1", data transfer is restarted. 2010.07 - Rev. B www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. |
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