S-25C160A Datasheet, PDF (14/39 Pages) Seiko Instruments Inc – Write protect function during the low power supply

SPI SERIAL E²PROM
S-25C160A
Rev.4.2_02_H
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 clocks) while CS is in “L”.
CS
WP
SCK
SI
SO
High / Low
1
2
3
4
5
6
7
8
Instruction
High-Z
Figure 13 WREN Operation
14