11/16

AN ENLARGEMENT

・The rising edge

WP cancellation

effective period

●

WP EFFECTIVE TIMING

WP is fixed to "H" or "L" usually . But in case of controlling WP to cancel the write command, please pay attention to “WP

effective timing” as follows.

During write command input , write command is canceled by controlling WP "H" within the WP cancellation effective

period.

The period from the start condition to the rising edge of the clock which take in DO of the data (the first byte of the data for

Page Write) is the cancellation invalid period. WP input is don't care during the period. Setup time for rising edge of the

SCL which takes in DO must be more than 100ns.

The period from the rising edge of SCL which takes in DO to the end of internal write cycle (tWR) is the cancellation

effective period. In case of setting WP to "H" during tWR, WRITE operation is stopped in the middle and the data of

accessing address is not guaranteed, so that write correct data again please.

It is not necessary waiting tWR (5msMax.) after stopping command by WP, because the device is standby state.

●

COMMAND CANCELLATION BY START AND STOP CONDITION

During a command input, it is canceled by the successive inputs of start condition and stop condition.(Fig.42)

But during ACK or data output, the device may output the SDA line LOW. In such cases, operation of start and stop

condition is impossible, so that the reset can't work. Execute the software reset in the cases. (Fig.39)

Operating the command cancel by start and stop condition during the command of Random Read or Sequential Read or

Current Read, internal address counter is not confirmed.

Therefore operation of Current Read after this is not valid. Operate a Random Read in this case.

・

The rising edge of the clock

which take in DO

SCL

D0

ACK

AN ENLARGEMENT

SCL

SDA

ACK

D0

SDA

WP

WP cancellation

invalid period

Data is not

guaranteed

No data will be written

Stop of the write

operation

Fig.41 WP EFFECTIVE TIMING

SLAVE

ADDRESS

D7 D6 D5 D4 D3 D2 D1 D0

DATA

tWR

SDA

D1

S

T

A

R

T

A

C

K

L

A

C

K

L

A

C

K

L

A

C

K

L

S

T

O

P

WORD

ADDRESS

Fig.42 COMMAND CANCELLATION BY START AND STOP CONDITION DURING

THE INPUT OF SLAVE ADDRESS

SCL

SDA

1

1

0

0

START

CONDITION

STOP

CONDITION