ACE25C200 Datasheet, PDF (12/32 Pages) ACE Technology Co., LTD. – 2MB Serial Flash Memory

ACE25C200
2MB Serial Flash Memory
Figure 6 Write disable instruction
Read status register (RDSR) (05h)
The Read Status Register instructions allow the 8-bit Status Registers to be read. The instruction is
entered by driving CS# low and shifting the instruction code “05h” into the DI pin on the rising edge of
CLK. The status register bits are then shifted out on the DO pin at the falling edge of CLK with most
significant bit (MSB) first as shown in Figure 7. The Status Register bits are shown in Figure 4 and
include the WIP, WEL, BP2-BP0 and SRP bits.
The Read Status Register instruction may be used at any time, even while a Program, Erase or Write
Status Register cycle is in progress. This allows the WIP status bit to be checked to determine when
the cycle is complete and if the device can accept another instruction. The Status Register can be
read continuously. The instruction is completed by driving CS# high.
Figure 7 Read status register instruction
Write Status Register (WRSR) (01h)
The Write Status Register (WRSR) instruction allows the Status Register to be written. Only
non-volatile Status Register bits SRP, BP2, BP1, BP0 can be written to. All other Status Register bit
locations are read-only and will not be affected by the Write Status Register (WRSR) instruction. The
Status Register bits are shown in Figure 4, and described in 10 Status Register.
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