S-25C010A-H Datasheet, PDF (19/33 Pages) Seiko Instruments Inc – OPERATION SPI SERIAL E2PROM FOR AUTOMOTIVE

Rev.2.3_01_C
105°C OPERATION SPI SERIAL E²PROM FOR AUTOMOTIVE
S-25C010A/020A/040A H Series
7. Write memory data (WRITE)
Figures 17 and 18 show the timing charts 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-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 Figures 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).
4 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 lower 4 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 WP signal is in “L”.
To cancel the WRITE instruction, input the clock different from a specified value (n = 16 + m × 8 clocks) while CS is in
“L”.
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