S-25C080A H Series

Seiko Instruments Inc.

13

2. Write enable (WREN)

Before writing data (WRITE and WRSR), be sure to set bit Write Enable Latch (WEL). This instruction is to set bit WEL.

Its operation is below.

After selecting the device by the chip select ( CS ), input the instruction code from serial data input (SI). To set bit WEL,

set the device in the non-select status by CS at the 8th clock of the serial clock (SCK). To cancel the WREN

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

SO

SCK

WP

CS

SI

Instruction

High-Z

12345678

High / Low

Figure 11 WREN Operation