BR25H010-W ROHM [Rohm], BR25H010-W Datasheet - Page 6

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

●Features
●Status registers
●Write disable block setting
WPEN EEPROM
○Status registers
○ WPB pin
○HOLDB pin
WEN
BP1
BP0
BP1
R/B
Product number
BR25H010-W
BR25H020-W
BR25H040-W
BR25H080-W
BR25H160-W
BR25H320-W
bit
Product number
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.
0
0
1
1
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.
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.
BR25H010-W
BR25H020-W
BR25H040-W
BR25H080-W
BR25H160-W
BR25H320-W
BP0
EEPROM
Register
Register
Memory
location
0
1
0
1
BR25H010-W
60h-7Fh
40h-7Fh
00h-7Fh
Write and write status register write enable / disable status confirmation bit
None
Prohibition possible
WPEN
but WPEN bit “1”
bit 7
1
Prohibition
Write cycle status (READY / BUSY) status confirmation bit
possible
WRSR
EEPROM write disable block designation bit
bit 6
BR25H020-W
1
0
WPB pin enable / disable designation bit
C0h-FFh
80h-FFh
00h-FFh
None
bit 5
1
0
WEN=0=prohibited
WEN=1=permitted
WPEN=0=invalid
WPEN=1=valid
R/B=0=READY
R/B=1=BUSY
Function
Prohibition
Prohibition
impossible
possible
bit 4
WRITE
BR25H040-W
1
0
180h-1FFh
100h-1FFh
000h-1FFh
None
Write disable block
6/16
bit 3
BP1
BP1
BP0
BP0
bit 2
BR25H080-W
300h-3FFh
200h-3FFh
000h-3FFh
None
WEN
WEN
bit 1
This enables / disables the functions
of WPB pin.
This designates the write disable area
of EEPROM. Write designation areas
of product numbers are shown below.
BR25H160-W
bit 0
R/B
R/B
600h-7FFh
400h-7FFh
000h-7FFh
None
Contents
BR25H320-W
C00h-FFFh
800h-FFFh
000h-FFFh
None