W25P10 Datasheet, PDF (19/35 Pages) Winbond – 1M-BIT, 2M-BIT AND 4M-BIT SERIAL FLASH MEMORY WITH 40MHZ SPI

W25P10, W25P20 AND W25P40
7.2.10 Sector Erase (D8h)
The Sector Erase instruction sets all memory within a specified sector to the erased state of all 1s
(FFh). A Write Enable instruction must be executed before the device will accept the Erase Sector
Instruction (Status Register bit WEL must equal 1). The instruction is initiated by driving the /CS pin
low and shifting the instruction code “D8h” followed a 24-bit sector address (A23-A0) (see Figure 2).
The lowest 16 address bits (A15-A0) must be set to 0. The Sector Erase instruction sequence is
shown in figure 11.
The /CS pin must be driven high after the eighth bit of the last byte has been latched. If this is not
done the Sector Erase instruction will not be executed. After /CS is driven high, the self-timed Sector
Erase instruction will commence for a time duration of tSE (See AC Characteristics). While the Sector
Erase cycle is in progress, the Read Status Register instruction may still be accessed for checking the
status of the BUSY bit. The BUSY bit is a 1 during the Sector Erase cycle and becomes a 0 when the
cycle is finished and the device is ready to accept other instructions again. After the Sector Erase
cycle has finished the Write Enable Latch (WEL) bit in the Status Register is cleared to 0. The Sector
Erase instruction will not be executed if the addressed page is protected by the Block Protect (BP2,
BP1, BP0) bits (see Status Register Memory Protection table).
Figure 11. Sector Erase Instruction Sequence Diagram
Publication Release Date: November 28, 2005
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Revision M