S-25C080AH datasheet(18/31 Pages) ABLIC

18 / 31 page

105°C OPERATION SPI SERIAL E2PROM FOR AUTOMOTIVE

S-25C080A H Series

Rev.2.3_03_C

7. Write memory data (WRITE)

Figure 16 shows 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 and WEL are reset to “0” when Write has

completed.

The S-25C080A can Page Write of 32 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 17. 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 32 bytes, the higher bits in the address do not change. And 5 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.

To cancel the WRITE instruction, input the clock different from a specified value (n = 24+m

× 8 clock) while CS is in

“L”.

SCK

Instruction

High-Z

12345678

High / Low

910

16-bit Address

A15 A14 A13

Data Byte 1

Remark The higher addresses A15 to A10 = Don’t care.

Figure 16 WRITE Operation (1 byte)

S-25C080AH Datasheet(PDF) 18 Page - ABLIC Inc.