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After the LSB of the last data word, Chip Select (S) must be brought Low before the next rising edge of the Clock (C). The falling edge of Chip Select (S) initiates the internal, self-timed write cycle. The Page Write operation will not be performed if any of the 4 words is addressing the protected area. If the ST93CS66/67is still performing the program- ming cycle, the Busy signal (Q = 0) will be returned if the Chip Select input (S) is driven high, and the ST93CS66/67 will ignore any data on the bus. When the write cycle is completed, the Ready signal (Q = 1) will indicate (if S is driven high) that the ST93CS66/67is ready to receive a newinstruc- tion.
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