S-25C080A データシートの表示（PDF） - Seiko Instruments Inc

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S-25C080A

CMOS SPI 8K SERIAL E2PROM

Seiko Instruments Inc 

CMOS SPI 8K SERIAL E2PROM

S-25C080A

Rev.1.1_00

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 and 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

CS

WP

High / Low

SCK

SI

SO

1

2

3

4

5

6

7

8

Instruction

High-Z

Figure 13 WRDI operation

14

Seiko Instruments Inc.

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