BR25L010-W_10 Datasheet, PDF (7/17 Pages) Rohm – SPI BUS Serial EEPROMs

BR25L010-W, BR25L020-W, BR25L040-W, BR25L080-W, BR25L160-W, BR25L320-W, BR25L640-W Technical Note
Command mode
Command
WREN Write enable
WRDI Write disable
READ Read
WRITE Write
RDSR Read status register
WRSR Write status register
Ope code
Contents
BR25L010-W
BR25L020-W
BR25L040-W
BR25L080-W
BR25L160-W
BR25L320-W
BR25L640-W
Write enable command 0000 * 110 0000 * 110 0000 0110
Write disable command 0000 * 100 0000 * 100 0000 0100
Read command
0000 * 011 0000 A8011 0000 0011
Write command
Status register read
command
Status register write
command
0000 * 010 0000 A8010 0000 0010
0000 * 101 0000 * 101 0000 0101
0000 * 001 0000 * 001 0000 0001
Timing chart
1. Write enable (WREN) / disable (WRDI) cycle
1.WREN (WRITE ENABLE) : Write enable
CS
SCK
0 12 34 56 7
SI
0 0 0 0 *1 1
10
SO ^High-Z
*1 BR25L010/020/040-W=Don't care
Fig. 35 Write enable command
BR25L080/160/320/640-W=“0” input
1.WRDI (WRITE DISABLE) : Write disable
CS
SCK
0 12 34 5 6 7
SI
0 0 0 0 *1 1 0 0
High-Z
SO
Fig. 36 Write disable
*1 BR25L010/020/040-W=Don't care
BR25L080/160/320/640-W=“0” input
This IC has write enable status and write disable status. It is set to write enable status by write enable command, and it is
set to write disable status by write disable command. As for these commands, set CS LOW, and then input the respective
ope codes. The respective commands accept command at the 7-th clock rise. Even with input over 7 clocks, command
becomes valid.
When to carry out write and write status register command, it is necessary to set write enable status by the write enable
command. If write or write status register command is input in the write disable status, commands are cancelled. And even
in the write enable status, once write and write status register command is executed once, it gets in the write disable
status. After power on, this IC is in write disable status.
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7/16
2010.07 - Rev. B