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ST93C47CM1TR Datasheet(PDF) 7 Page - STMicroelectronics |
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ST93C47CM1TR Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 13 page AI00878C 11 0 An A0 Qn Q0 DATA OUT D S Q READ S WRITE ADDR OP CODE 1 0 An A0 DATA IN D Q OP CODE Dn D0 1 BUSY READY S ERASE WRITE ENABLE 1 0 Xn X0 D OP CODE 1 01 S ERASE WRITE DISABLE 1 0 Xn X0 D OP CODE 00 0 CHECK STATUS ADDR Figure 6. READ, WRITE, EWEN, EWDS Sequences Erase The Erase instruction (ERASE) programs the ad- dressed memory byte or word bits to ’1’. Once the address is correctly decoded, the falling edge of the Chip Select input (S) starts a self-timed program- ming cycle. If the ST93C46 is still performing the write cycle, the Busy signal (Q = 0) will be returned if S is driven high, and the ST93C46 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 ST93C46 is ready to receive a new instruction. Write The Write instruction (WRITE) is followed by the address and the 8 or 16 data bits to be written. Data input is sampled on the Low to High transition of the clock. After the last data bit has been sampled, Chip Select (S) must be brought Low before the next rising edge of the clock (C), in order to start the self-timed programming cycle. If the ST93C46 is still performing the write cycle, the Busy signal Notes: 1. An: n = 5 for x16 org. and 6 for x8 org. 2. Xn: n = 3 for x16 org. and 4 for x8 org. 7/13 ST93C46A/46C/46T, ST93C47C/47T |
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