S-25C040A0I-T8T1G View Datasheet(PDF) - Seiko Instruments Inc

Part Name

Description

MFG CO.

S-25C040A0I-T8T1G

CMOS SPI SERIAL E2PROM

Seiko Instruments Inc 

CMOS SPI SERIAL E2PROM

S-25C010A/020A/040A

Rev.1.0_00

7. Write memory data (WRITE)

Figure 17 and 18 show the timing chart when inputting 1-byte data. Input the instruction code, the address and data

from serial data input (SI) after inputting “L” to the chip select ( CS ). To start Write (tPR), set the chip select ( CS ) to “H”

after inputting data or before inputting a rising of the next serial clock. Bit WIP is reset to “0” when Write has completed.

The S-25C010A/020A/040A can Page Write of 16 bytes. Its function to transmit data is as same as Byte Write basically,

but it operates Page Write by receiving sequential 8-bit Write data as much data as page size has. Input the instruction

code, the address and data from serial data input (SI) after inputting “L” in CS , as the WRITE operation (page) shown in

Figure 19 and 20. Input the next data while keeping CS in “L”. After that, repeat inputting data of 8-bit sequentially. At

the end, by setting CS to “H”, the WRITE operation starts (tPR).

5 of the lower bits in the address are automatically incremented every time when receiving Write data of 8-bit. Thus,

even if Write data exceeds 16 bytes, the higher bits in the address do not change. And 4 of lower bits in the address roll

over so that Write data which is previously input is overwritten.

These are cases when the WRITE instruction is not accepted or operated.

• Bit WEL is not set to “1” (not set to “1” beforehand immediately before the WRITE instruction)

• During Write

• The address to be written is in the protect area by BP1 and BP0.

• The signal WP is in “L”.

To cancel the WRITE instruction, input the clock different from a specified value (n = 16+m × 8clock) while CS is in “L”.

18

Seiko Instruments Inc.

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