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W25Q40BL

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7.2.21

Page Program (02h)

The Page Program instruction allows from one byte to 256 bytes (a page) of data to be programmed at

previously erased (FFh) memory locations. A Write Enable instruction must be executed before the device

will accept the Page Program Instruction (Status Register bit WEL= 1). The instruction is initiated by

driving the /CS pin low then shifting the instruction code “02h” followed by a 24-bit address (A23-A0) and

at least one data byte, into the DI pin. The /CS pin must be held low for the entire length of the instruction

while data is being sent to the device. The Page Program instruction sequence is shown in figure 19.

If an entire 256 byte page is to be programmed, the last address byte (the 8 least significant address bits)

should be set to 0. If the last address byte is not zero, and the number of clocks exceed the remaining

page length, the addressing will wrap to the beginning of the page. In some cases, less than 256 bytes (a

partial page) can be programmed without having any effect on other bytes within the same page. One

condition to perform a partial page program is that the number of clocks can not exceed the remaining

page length. If more than 256 bytes are sent to the device the addressing will wrap to the beginning of the

page and overwrite previously sent data.

As with the write and erase instructions, the /CS pin must be driven high after the eighth bit of the last byte

has been latched. If this is not done the Page Program instruction will not be executed. After /CS is driven

high, the self-timed Page Program instruction will commence for a time duration of tpp (See AC

Characteristics). While the Page Program 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 Page Program

cycle and becomes a 0 when the cycle is finished and the device is ready to accept other instructions

again. After the Page Program cycle has finished the Write Enable Latch (WEL) bit in the Status Register

is cleared to 0. The Page Program instruction will not be executed if the addressed page is protected by

the Block Protect (CMP, SEC, TB, BP2, BP1, and BP0) bits.

Figure 19. Page Program Instruction Sequence Diagram

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