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BR25H020FJ-W Datasheet(PDF) 6 Page - Rohm |
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BR25H020FJ-W Datasheet(HTML) 6 Page - Rohm |
6 / 17 page 6/16 ● Features ○ 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. ● Status registers Product number bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 BR25H010-W BR25H020-W BR25H040-W 1 1 1 1 BP1 BP0 WEN R/B BR25H080-W BR25H160-W BR25H320-W WPEN 0 0 0 BP1 BP0 WEN R/B bit Memory location Function Contents WPEN EEPROM WPB pin enable / disable designation bit WPEN=0=invalid WPEN=1=valid This enables / disables the functions of WPB pin. BP1 BP0 EEPROM EEPROM write disable block designation bit This designates the write disable area of EEPROM. Write designation areas of product numbers are shown below. WEN Register Write and write status register write enable / disable status confirmation bit WEN=0=prohibited WEN=1=permitted R/B Register Write cycle status (READY / BUSY) status confirmation bit R/B=0=READY R/B=1=BUSY ● Write disable block setting Write disable block BP1 BP0 BR25H010-W BR25H020-W BR25H040-W BR25H080-W BR25H160-W BR25H320-W 0 0 None None None None None None 0 1 60h-7Fh C0h-FFh 180h-1FFh 300h-3FFh 600h-7FFh C00h-FFFh 1 0 40h-7Fh 80h-FFh 100h-1FFh 200h-3FFh 400h-7FFh 800h-FFFh 1 1 00h-7Fh 00h-FFh 000h-1FFh 000h-3FFh 000h-7FFh 000h-FFFh ○ WPB pin By setting WPB=LOW, write command is prohibited. As for BR25H080, 160, 320-W, only when WPEN bit is set “1”, the WPB pin functions become valid. And the write command to be disabled at this moment is WRSR. As for BR25H010, 020,040-W, both WRITE and WRSR commands are prohibited. However, when write cycle is in execution, no interruption can be made. Product number WRSR WRITE BR25H010-W BR25H020-W BR25H040-W Prohibition possible Prohibition possible BR25H080-W BR25H160-W BR25H320-W Prohibition possible but WPEN bit “1” Prohibition impossible ○ HOLDB pin By HOLDB pin, data transfer can be interrupted. When SCK=”1”, by making HOLDB from “1” into”0”, data transfer to EEPROM is interrupted. When SCK = “0”, by making HOLDB from “0” into “1”, data transfer is restarted. |
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