Technical Note

9/16

BR35H□□□-WC Series

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2011.03 - Rev.C

© 2011 ROHM Co., Ltd. All rights reserved.

4.Status register read command

The EEPROM status can be read by use of the status register read command. For this command set CSB to Low then

input the ope code of the status register read command followed by the clock input as shown above. The data of status

register will then be read out. This command features increment functionality. When clock input is continued during

CSB=Low, 8 bytes of status register data will be continuously read out. When this command is executed from the start of

write programming to the end of write programming, the end of write programming can be confirmed by checking the

following changes: WEN=Low followed by R/B=Low. After confirming the end of write programming, before inputting the

next command CSB first needs to be High and then put back to Low.

●

At standby

○

Current at standby

Set CSB “H”, and be sure to set SCK, SI input “L” or “H”. Do not input intermediate electric potantial.

○

Timing

As shown in Fig.39, at standby, when SCK is “H”, even if CSB falls, SI status is not read at fall edge. SI status is read at

SCK rise edge after fall of CSB. At standby and at power ON/OFF, set CSB “H” status

High-Z

bit7

bit6

bit5

bit4

0

0

0

bit3

bit2

bit1

bit0

13

CSB

SCK

SI

1

1

10

6

0

SO

14

1

2

WEN

R/B

11

15

3

7

9

0

5

12

0

0

0

0

0

4

8

0

0

0

Fig.38

Status register read command (BR35H160/320/640/128-WC)

0

1

2

Command start here. SI is read.

Even if CSB is fallen at SCK=SI=”H”,

SI status is not read at that edge.

CSB

SCK

SI

Fig.39

Operating timing