BR25H080F-2LB_14 Datasheet, PDF (16/32 Pages) Rohm – Operation SPI BUS EEPROM

BR25H080F-2LB
Datasheet
Timing Chart
1. Write enable (WREN) / disable (WRDI) cycle
WREN (WRITE ENABLE): Write enable
CSB
SCK
01234567
SI
0 0 0 00 1 1 0
SO ^High-Z
Figure 35. Write enable command
WRDI (WRITE DISABLE): Write disable
CSB
SCK
0
1
2
3
4
5
6
7
SI
0
0
0
00
1
0
0
SO
High-Z
Figure 36. Write disable
○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 CSB 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. It gets in the write disable status. After
power on, this IC is in write disable status.
2. Read command (READ)
CSB
～～
～～
～～
SCK
～～
012 345 678
～～
14
23 24
～～
SI
00 0 0 0 0
High-Z
SO
～～
～～
1 1 ＊ ＊_{～ ～} ＊ A9 _{～ ～} A1 A0
～～
～～
～～
～～
D7 D6
30
D2 D1 D0
Figure 37. Read command
*=Don’t Care
Product
number
BR25H080F-2LB
Address
length
A9-A0
By read command, data of EEPROM can be read. As for this command, set CSB LOW, then input address after read ope
code. EEPROM starts data output of the designated address. Data output is started from SCK fall of 23 clock, and from D7 to
D0 sequentially. This IC has increment read function. After output of data for 1 byte (8bits), by continuing input of SCK, data
of the next address can be read. Increment read can read all the addresses of EEPROM. After reading data of the most
significant address, by continuing increment read, data of the most insignificant address is read.
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TSZ22111・15・001
16/28
TSZ02201-0R1R0G100330-1-2
27.Feb.2014 Rev.002