BR35H160-WC ROHM Co. Ltd., BR35H160-WC Datasheet - Page 8

• Manufacturer Part Number: BR35H160-WC
• Description: Automotive Serial Eeproms
• Manufacturer: ROHM Co. Ltd.

●Example of Page write command
© 2011 ROHM Co., Ltd. All rights reserved.
BR35H□□□-WC Series
www.rohm.com
page m-1
page
No.
In page write command, when data is set to the last address of a page (e.g. address “03Fh” of page 1), the next data will be
set to the top address of the same page (e.g. address “020h” of page 1). This is why page write address increment is
available in the same page. As a reference, if of 32 bytes, page write command is executed for 2 bytes the data of the other
30 bytes without addresses will not be changed.
page 1
page 2
①
②
③
④
⑤
page0
This column addresses are
Top address of this page
a：In case of input the data of No.② which is 2 bytes page write command for the data of No.①, EEPROM data changes
b：In case of input the data of No.④ which is 34 bytes page write command for the data of No.①, EEPROM data changes
c：In case of a or b, when write command is cancelled, EEPROM data keep No.①.
・
・
・
With the write command data can be written to the EEPROM. As for this command, set CSB to LOW, then input address
and data after inputting the write ope code. Then, by making CSB HIGH, the EEPROM starts writing. The write time of
EEPROM requires time of tE/W (Max 5ms). During tE/W, commands other than the status read command are not
accepted. Start CSB after taking the last data (D0) and before the next SCK clock starts. At other timings the write
command will not be executed and will be cancelled. The IC has page write functionality. After input 1 byte (8bits) of data,
by continuing data input without starting CSB, data up to 32/64
insignificant 5/6
written to the respective addresses. When data larger then the maximum bytes is input the address rolls over and
previously input data is overwritten.
and the next SCK rising edge. At other timings the write command is not executed and cancelled (Fig.42 valid timing c).
In page write, the CSB valid timing is every 8 bits. If CSB rises at other timings page write is cancelled together with the
write command and the input data is reset.
Write command is executed when CSB rises between the SCK clock rising edge to recognize the 8th bit’s of data input
*4
like No.③.
like No.⑤.
m
*3 n=8191d=1FFFh: BR35H640-WC
*4 m=255 : BR35H640-WC
m=127：BR35H320-WC
m=63：BR35H160-WC
Addresses of Page0
000h
020h
040h
n=4095d=FFFh：BR35H320-WC
n=2047d=7FFh：BR35H160-WC
n-63
n-31
2 bytes input data
34 byte input data
・
・
・
Previous data
After No.②
After No.④
Fig.37 EEPROM physical address for Page write command (32/64Byte)
001h
021h
041h
n-62
n-30
*2
・
・
・
bit of the designated address is incremented internally every time 1 byte of data is input, and data is
002h
022h
042h
n-61
n-29
・
・
・
32byte
･･･
･･･
･･･
･･･
･･･
・
・
・
000h
AAh
AAh
AAh
FFh
FFh
00h
01Eh
03Eh
05Eh
n-33
This column addresses are the
last address of this page
n-1
・
・
・
01Fh
03Fh
05Fh
001h
n-32
*3
01h
55h
55h
55h
00h
00h
・
・
・
n
002h
AAh
AAh
02h
02h
-
-
8/16
page
page m-1
This column addresses are
Top address of this page
page 0
page 1
page 2
・
・
・
*6
m
････
････
････
････
････
････
････
*1
*5 n=16383d=3FFFh：BR35H128-WC
*6 m=255：BR35H128-WC
bytes can be written in one tE/W. In page write, the
0000h
0040h
0080h
n-127
n-63
・
・
・
01Eh
1Eh
1Eh
AAh
AAh
-
-
0001h
0041h
0081h
n-126
n-62
・
・
・
*1 BR35H160/320/640-WC = Max 32 Bytes
*2 BR35H160/320/640-WC = Lower 5 bits
BR35H128-WC
BR35H128-WC
01Fh
0002h
0042h
0082h
1Fh
1Fh
55h
55h
n-125
n-61
-
-
64byte
・
・
・
･･･
･･･
･･･
･･･
･･･
・
・
・
This column addresses are the
last address of this page
00BEh
003Eh
007Eh
Technical Note
n-65
2011.03 - Rev.C
n-1
・
・
・
= Max 64 Bytes
= Lower 6 bits
00BFh
003Fh
007Fh
n-64
*5
・
・
・
n