BR25H010-W ROHM [Rohm], BR25H010-W Datasheet - Page 9

• Manufacturer Part Number: BR25H010-W
• Manufacturer: ROHM [Rohm]

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
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.
CSB
SCK
CSB
SCK
CSB
CSB
SCK
SCK
SO
SO
SO
SO
SI
SI
SI
SI
High-Z
High-Z
High-Z
High-Z
0
0
0
0
0
0
0
0
Fig.39 Status register write command (BR25H010/020/040-W)
Fig.40 Status register write command (BR25H080/160/320-W)
0
0
0
0
1
1
Fig.41 Status register read command (BR25H010/020/040-W)
Fig.42 Status register read command (BR25H080/160/320-W)
1
1
0
0
0
0
2
2
2
2
0
0
3
3
0
0
3
3
0
ж
4
4
ж
0
0
0
4
4
5
5
1
1
5
5
0
0
6
6
0
0
1
1
6
6
7
7
WPEN
bit7
bit7
1
1
ж
7
7
8
8
WPEN
bit7
bit7
bit6
bit6
*
ж
1
9
9
8
8
9/16
bit6
bit6
bit5
bit5
*
ж
10
10
1
0
9
9
bit4
bit4
ж
*
bit5
bit5
11
11
1
0
*1
10
10
BP1 BP0
BP1 BP0
bit3
bit3
3bits including BR25H080/160/320-W WPEN (bit7)
12
12
bit4
bit4
1
0
11
11
bit2
bit2
13
13
BP1
bit3
BP1
bit3
12
12
bit1
bit1
ж
*
14
14
BP0
BP0
bit2
bit2
13
13
bit0
bit0
ж
*
15
15
WEN
bit1
WEN
bit1
ж
=Don’t care
14
14
ж
ж
=Don't care
=Don't care
R/B
R/B
bit0
bit0
15
15
ж1
, that is,