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BR25H020FJ-W Datasheet(PDF) 9 Page - Rohm |
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BR25H020FJ-W Datasheet(HTML) 9 Page - Rohm |
9 / 17 page 9/16 4. Status register write / read command Write status register command can write status register data. The data can be written by this command are 2 bits ж1, that is, BP1 (bit3) and BP0 (bit2) among 8 bits of status register. By BP1 and BP0, write disable block of EEPROM can be set. As for this command, set CSB LOW, and input ope code of write status register, and input data. Then, by making CSB HIGH, EEPROM starts writing. Write time requires time of tE/W as same as write. As for CSB rise, start CSB after taking the last data bit (bit0), and before the next SCK clock starts. At other timing, command is cancelled. Write disable block is determined by BP1 and BP0, and the block can be selected from 1/4 of memory array, 1/2, and entire memory array. (Refer to the write disable block setting table.) To the write disabled block, write cannot be made, and only read can be made. *1 3bits including BR25H080/160/320-W WPEN (bit7) CSB SCK High-Z ж=Don't care 0 0 0 0 ж 1 ж 0 1 2 4 0 SI SO 0 3 7 8 5 6 ж 9 10 11 12 13 14 15 ж ж BP1 BP0 ж ж bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 CSB SCK High-Z ж=Don't care 0 0 0 0 1 WPEN 0 1 2 4 0 SI SO 0 3 7 8 5 6 * 9 10 11 12 13 14 15 * * BP1 BP0 * * bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 0 Fig.39 Status register write command (BR25H010/020/040-W) Fig.40 Status register write command (BR25H080/160/320-W) High-Z bit7 bit6 bit5 bit4 1 1 BP0 1 BP1 bit3 bit2 bit1 bit0 13 CSB SCK SI 1 1 10 6 0 SO 14 1 2 WEN R/B 11 15 3 7 9 0 5 12 0 0 0 0 ж 4 8 1 ж=Don’t care High-Z bit7 bit6 bit5 bit4 0 0 BP0 0 BP1 bit3 bit2 bit1 bit0 13 CSB SCK SI 1 1 10 6 0 SO 14 1 2 WEN R/B 11 15 3 7 9 0 5 12 0 0 0 0 0 4 8 WPEN Fig.41 Status register read command (BR25H010/020/040-W) Fig.42 Status register read command (BR25H080/160/320-W) |
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