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M45PE20-VMN6TG Datasheet(PDF) 17 Page - STMicroelectronics |
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M45PE20-VMN6TG Datasheet(HTML) 17 Page - STMicroelectronics |
17 / 35 page 17/35 M45PE20 Page Write (PW) The Page Write (PW) instruction allows bytes to be written in the memory. Before it can be accept- ed, a Write Enable (WREN) instruction must previ- ously have been executed. After the Write Enable (WREN) instruction has been decoded, the device sets the Write Enable Latch (WEL). The Page Write (PW) instruction is entered by driving Chip Select (S) Low, followed by the in- struction code, three address bytes and at least one data byte on Serial Data Input (D). The rest of the page remains unchanged if no power failure occurs during this write cycle. The Page Write (PW) instruction performs a page erase cycle even if only one byte is updated. If the 8 least significant address bits (A7-A0) are not all zero, all transmitted data exceeding the ad- dressed page boundary wrap round, and are writ- ten from the start address of the same page (the one whose 8 least significant address bits (A7-A0) are all zero). Chip Select (S) must be driven Low for the entire duration of the sequence. The instruction sequence is shown in Figure 13.. If more than 256 bytes are sent to the device, pre- viously latched data are discarded and the last 256 data bytes are guaranteed to be written correctly within the same page. If less than 256 Data bytes are sent to device, they are correctly written at the requested addresses without having any effects on the other bytes of the same page. Chip Select (S) must be driven High after the eighth bit of the last data byte has been latched in, otherwise the Page Write (PW) instruction is not executed. As soon as Chip Select (S) is driven High, the self- timed Page Write cycle (whose duration is tPW) is initiated. While the Page Write cycle is in progress, the Status Register may be read to check the val- ue of the Write In Progress (WIP) bit. The Write In Progress (WIP) bit is 1 during the self-timed Page Write cycle, and is 0 when it is completed. At some unspecified time before the cycle is complete, the Write Enable Latch (WEL) bit is reset. A Page Write (PW) instruction applied to a page that is Hardware Protected is not executed. Any Page Write (PW) instruction, while an Erase, Program or Write cycle is in progress, is rejected without having any effects on the cycle that is in progress. Figure 13. Page Write (PW) Instruction Sequence Note: 1. Address bits A23 to A18 are Don’t Care 2. 1 ≤ n ≤ 256 C D AI04045 S 42 41 43 44 45 46 47 48 49 50 52 53 54 55 40 C D S 23 2 1 3456789 10 28 29 30 31 32 33 34 35 22 21 3210 36 37 38 Instruction 24-Bit Address 0 765432 0 1 Data Byte 1 39 51 765432 0 1 Data Byte 2 765432 0 1 Data Byte 3 Data Byte n 765432 0 1 MSB MSB MSB MSB MSB |
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