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SST25WF020A Datasheet(PDF) 11 Page - Microchip Technology |
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SST25WF020A Datasheet(HTML) 11 Page - Microchip Technology |
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11 / 39 page  2014 Microchip Technology Inc. DS20005139E-page 11 SST25WF020A 5.3 Page-Program The Page-Program instruction programs up to 256 Bytes of data in the memory. The data for the selected page address must be in the erased state (FFH) before initiating the Page-Program operation. A Page-Pro- gram applied to a protected memory area will be ignored. Prior to the program operation, execute the WREN instruction. To execute a Page-Program operation, the host drives CE# low, then sends the Page-Program command cycle (02H), three address cycles, followed by the data to be programmed, and then drives CE# high. The pro- grammed data must be between 1 to 256 Bytes and in whole byte increments; sending less than a full byte will cause the partial byte to be ignored. Poll the BUSY bit in the Status register, or wait TPP, for the completion of the internal, self-timed, Page-Program operation. See Figure 5-3 for the Page-Program sequence and Figure 6-9 for the Page-Program flow chart. When executing Page-Program, the memory range for the SST25WF020A is divided into 256-Byte page boundaries. The device handles the shifting of more than 256 Bytes of data by maintaining the last 256 Bytes as the correct data to be programmed. If the tar- get address for the Page-Program instruction is not the beginning of the page boundary (A[7:0] are not all zero), and the number of bytes of data input exceeds or overlaps the end of the address of the page boundary, the excess data inputs wrap around and will be pro- grammed at the start of that target page. FIGURE 5-3: PAGE-PROGRAM SEQUENCE 25139 F60.1 CE# SO SI SCK ADD. 01 2 3 4 5 6 7 8 ADD. ADD. Data Byte 0 02 HIGH IMPEDANCE 15 16 23 24 31 32 39 MODE 0 MODE 3 MSB MSB MSB LSB CE#(cont’) SO(cont’) SI(cont’) SCK(cont’) 40 41 42 43 44 45 46 47 48 Data Byte 1 HIGH IMPEDANCE MSB MSB MSB LSB 50 51 52 53 54 55 49 Data Byte 2 Data Byte 255 LSB LSB LSB LSB |
Similar Part No. - SST25WF020A_14 |
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Similar Description - SST25WF020A_14 |
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