S-25A080A Datasheet, PDF (16/31 Pages) Seiko Instruments Inc – 125°C OPERATION SPI SERIAL E2PROM

125°C OPERATION SPI SERIAL E²PROM FOR AUTOMOTIVE ELECTRIC COMPONENT
S-25A080A/160A/320A
Rev.1.0_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
• 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 11 WRDI Operation
16
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