The Write Enable Latch (WEL) bit of the STATUS register must be set to a logic
‘1’ prior to each Write STATUS Register (WRSR) and
Write to Memory Array (WRITE) instructions. This is accomplished by
sending a WREN (06h) instruction to the
AT25080B/AT25160B/AT25320B/AT25640B. First, the CS pin is driven low to
select the device and then a WREN instruction is clocked in on the SI
pin. Then the CS pin can be driven high and the WEL bit will be
updated in the STATUS register to a logic ‘1’. The device will power‑up
in the Write Disable state (WEL = 0).Figure 6-2. WREN Timing
