s-25a080a Seiko Instruments Inc., s-25a080a Datasheet - Page 16

• Manufacturer Part Number: s-25a080a
• Description: 25?c Operation Spi Serial E2prom For Automotive Electric Component
• Manufacturer: Seiko Instruments Inc.

16
125°C OPERATION SPI SERIAL E
S-25A080A/160A/320A
3. Write disable (WRDI)
SCK
WP
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.
SO
CS
SI
• 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
1
2
Figure 11 WRDI Operation
2
PROM FOR AUTOMOTIVE ELECTRIC COMPONENT
Seiko Instruments Inc.
3
High / Low
4
Instruction
High-Z
5
6
7
8
Rev.1.0
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