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LH28F020SU-L Datasheet(PDF) 9 Page - Sharp Corporation |
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LH28F020SU-L Datasheet(HTML) 9 Page - Sharp Corporation |
9 / 31 page 2M (256K × 8) Flash Memory LH28F020SU-L 9 Figure 5. Byte Writes with Compatible Status Register START BUS OPERATION COMMAND COMMENTS WRITE 40H or 10H WRITE DATA/ADDRESS CSR.7 = 0 1 0 1 0 1 CSR FULL STATUS CHECK IF DESIRED OPERATION COMPLETE CLEAR CSRD RETRY/ERROR RECOVERY DATA WRITE SUCCESSFUL VPP LOW DETECT READ CSRD (see above) CSR.4, 5 = CSR.3 = Write Write Read Standby Byte Write D = 40H or 10H A = X D = WD A = WA Q = CSRD Toggle CE or OE to update CSRD. A = X Repeat for subsequent Byte Writes. CSR Full Status Check can be done after each Byte Write, or after a sequence of Byte Writes. Write FFH after the last operation to reset device to read array mode. See Command Bus Cycle notes for description of codes. Check CSR.7 1 = WSM Ready 0 = WSM Busy BUS OPERATION COMMAND CSR FULL STATUS CHECK PROCEDURE COMMENTS Standby Standby Check CSR.4, 5 1 = Data Write Unsuccessful 0 = Data Write Successful Check CSR.3 1 = VPP Low Detect 0 = VPP OK CSR.3, 4, 5 should be cleared, if set, before further attempts are initiated. 28F020SUL15-4 READ COMPATIBLE STATUS REGISTER |
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