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Write Enable (WREN) and Write Disable (WRDI) The ST95P04 contains a write enable latch. This latch must be set prior to every WRITE or WRSR operation. The WREN instruction will set the latch and the WRDI instruction will reset the latch. The latch is reset under all the following conditions: - W pin is low - Poweron - WRDI instruction executed - WRSR instruction executed - WRITE instruction executed As soon as the WREN or WRDI instruction is received by the ST95P04, the circuit executes the instruction and enters a wait mode until it is dese- le cted.