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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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ST25E64EB6TR 데이터시트(PDF) 9 Page - STMicroelectronics |
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ST25E64EB6TR 데이터시트(HTML) 9 Page - STMicroelectronics |
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9 / 16 page  gram cycle. This STOP condition will trigger an internal memory program cycle only if the STOP condition is internally decoded right after the ACK bit; any STOP condition decoded out of this ”10th bit” time slot will not trigger the internal program- ming cycle. All inputs are disabled until the comple- tion of this cycle and the ST24/25E64 will not respond to any request. Minimizing System Delay by Polling On ACK. During the internal Write cycle, the ST24/25E64 disable itself from the bus in order to copy the data from the internal latches to the memory cells. The maximum value of the Write time (tW) is given in the AC Characteristics table, this timing value may be reduced by an ACK polling sequence issued by the master. The sequence is: – Initial condition: a Write is in progress (see Fig- ure 7). – Step 1: the Master issues a START condition followed by a Device Select byte. (1st byte of the new instruction) – Step 2: if the ST24/25E64 are internally writ- ing, no ACK will be returned. The Master goes back to Step1. If the ST24/25E64 have termi- nated the internal writing, it will issue an ACK. The ST24/25E64 are ready to receive the sec- ond part of the instruction (the first byte of this instruction was already sent during Step1). WRITE Cycle in Progress AI01099B Next Operation is Addressing the Memory START Condition DEVICE SELECT with RW = 0 ACK Returned YES NO YES NO ReSTART STOP Proceed WRITE Operation Proceed Random Address READ Operation Send Byte Address First byte of instruction with RW = 0 already decoded by ST24xxx Figure 7. Write Cycle Polling using ACK 9/16 ST24E64, ST25E64 |
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