S-25C010A Datasheet, PDF (14/37 Pages) Seiko Instruments Inc – CMOS SPI SERIAL E2PROM

CMOS SPI SERIAL E²PROM
S-25C010A/020A/040A
Rev.1.0_00
4. Read the status register (RDSR)
Reading data in the status register is possible by the RDSR instruction. During the Write operation, it is possible to
confirm the progress by checking bit WIP.
Set the chip select ( CS ) “L” first. After that, input the instruction code from serial data input (SI). The status of bit in the
status register is output from serial data output (SO). Sequential Read is available for the status register. To stop the
Read cycle, set CS to “H”.
It is possible to read the status register always. The bits in it are valid and can be read by RDSR even in the Write cycle.
However, during the Write cycle in progress, the nonvolatile bits BP1, BP0 are fixed in a certain value. These updated
values of bit can be obtained by inputting another new RDSR instruction after the Write cycle has completed. Contrarily,
two of Read Only bits WEL and WIP are being updated while the Write cycle is in progress.
b7, b6, b5, b4 are “1” when they are read by the RDSR instruction.
CS
WP
High / Low
SCK
SI
SO
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Instruction
X
High-Z
Outputs Data in the Status Register
b7 b6 b5 b4 b3 b2 b1 b0 b7
Remark X = Don’t care.
Figure 13 RDSR operation
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Seiko Instruments Inc.