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MM24164BN6T Datasheet(PDF) 6 Page - STMicroelectronics |
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MM24164BN6T Datasheet(HTML) 6 Page - STMicroelectronics |
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6 / 21 page  M24164 6/21 Figure 7. Write Mode Sequences with WC=1 (data write inhibited) Write Operations Following a Start condition the bus master sends a Device Select Code with the RW bit reset to 0. The device acknowledges this, as shown in Figure 8, and waits for an address byte. The device re- sponds to the address byte with an acknowledge bit, and then waits for the data byte. Writing to the memory may be inhibited if Write Control (WC) is driven High. Any Write instruction with Write Control (WC) driven High (during a pe- riod of time from the Start condition until the end of the address byte) will not modify the memory con- tents, and the accompanying data bytes are not acknowledged, as shown in Figure 7. When the bus master generates a Stop condition immediately after the Ack bit (in the “10th bit” time slot), either at the end of a Byte Write or a Page Write, the internal memory Write cycle is triggered. A Stop condition at any other time slot does not trigger the internal Write cycle. During the internal Write cycle, Serial Data (SDA) is disabled internally, and the device does not re- spond to any requests. Byte Write After the Device Select code and the address byte, the bus master sends one data byte. If the ad- dressed location is Write-protected, by Write Con- trol (WC) being driven High, the device replies with NoAck, and the location is not modified. If, instead, the addressed location is not Write-protected, the device replies with Ack. The bus master termi- nates the transfer by generating a Stop condition, as shown in Figure 8. Page Write The Page Write mode allows up to 16 bytes to be written in a single Write cycle, provided that they are all located in the same ’row’ in the memory: Byte Write DEV SEL BYTE ADDR DATA IN WC Page Write DEV SEL BYTE ADDR DATA IN 1 DATA IN 2 WC DATA IN 3 AI02803C Page Write (cont'd) WC (cont'd) DATA IN N ACK ACK NO ACK R/W ACK ACK NO ACK NO ACK R/W NO ACK NO ACK |
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