S-25C040A0I-T8T1G View Datasheet(PDF) - Seiko Instruments Inc

Part Name

Description

MFG CO.

S-25C040A0I-T8T1G

CMOS SPI SERIAL E2PROM

Seiko Instruments Inc 

Rev.1.0_00

CMOS SPI SERIAL E2PROM

S-25C010A/020A/040A

3. Write disable (WRDI)

The WRDI instruction is one of ways to reset bit Write Enable Latch (WEL). After selecting the device by the chip select

( CS ), input the instruction code from serial data input (SI).

To reset bit WEL, set the device in the non-select status by CS at the 8th clock of the serial clock. To cancel the WRDI

instruction, input the clock different from a specified value (n = 8 clock) while CS is in “L”.

Bit WEL is reset after the operations shown below.

• The power supply voltage is dropping

• Power on

• After performing WRDI

• After the completion of Write operation by the WRSR instruction

• After the completion of Write operation by the WRITE instruction

• After setting the WP pin to “L”

CS

WP

High / Low

SCK

SI

SO

Remark X = Don’t care.

1

2

3

4

5

6

7

8

Instruction

X

High-Z

Figure 12 WRDI operation

Seiko Instruments Inc.

13

Share Link: