5.37 Page Program (PP)
The Page Program (02H) instruction programs up to 256 bytes of data into the memory and supports both SPI and QPI protocols. Before initiating a Page Program operation, the target page address must be in an erased state (FFH). If the instruction is applied to a protected memory region, it is ignored. The Write Enable (WREN) instruction must be executed prior to issuing the Page Program command.
To perform a Page Program operation, the host drives CE# low, issues the Page Program command (02h) once in SPI or QPI mode, transmits three address bytes followed by the data to be programmed, and then drives CE# high. The amount of data programmed must be between 1 and 256 bytes, in whole-byte increments. Any partial byte transmitted is ignored. Completion of the internally self-timed Page Program operation can be determined by polling the BUSY bit in Status Register 1 or by waiting for the specified TPP duration. Refer to Figure 1 and Figure 2 for the Page Program command sequences in SPI and QPI modes.
During a Page Program operation, the memory is organized into 256-byte page boundaries. If more than 256 bytes are transmitted, the device programs only the last 256 bytes received. If the target address does not start at a page boundary (A[7:0] are not all zero) and the data length exceeds the remaining bytes in the page, the excess data wraps around and is programmed at the beginning of the same page.