S-25C160A Datasheet, PDF (16/39 Pages) Seiko Instruments Inc – Write protect function during the low power supply

SPI SERIAL E²PROM
S-25C160A
Rev.4.2_02_H
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.
The 2 bits WEL and WIP are updated during the write cycle. The updated nonvolatile bits SRWD, BP1 and BP0 can be
acquired by performing a new RDSR instruction after verifying the completion of the write cycle.
CS
WP
SCK
SI
SO
High / Low
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Instruction
High-Z
Outputs Data in the Status Register
b7 b6 b5 b4 b3 b2 b1 b0 b7
Figure 15 RDSR Operation
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