8 Write Sequence

To program the AT25080B/AT25160B, two separate instructions must be executed. First, the device must be write-enabled using the Write Enable (WREN) instruction. Then, one of the two write sequences described in this section may be executed.

Note: If the device is not write-enabled (WREN), it will ignore the WRITE instruction and return to the Standby state when CS is brought high. A new CS assertion is required to reinitiate communication.

The address of the memory location(s) to be programmed must be outside the protected address field location selected by the block write protection level. During an internal write cycle, all commands except the RDSR instruction are ignored. Refer to Table 8-1 for the AT25080B/AT25160B address bits.

Table 8-1. AT25080B/AT25160B Address Bits
Address	AT25080B	AT25160B
A_N	A₉–A₀	A₁₀–A₀
Don’t Care Bits	A₁₅–A₁₀	A₁₅–A₁₁