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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AT89C51AC2 датащи(PDF) 41 Page - ATMEL Corporation |
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AT89C51AC2 датащи(HTML) 41 Page - ATMEL Corporation |
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41 / 121 page  41 A/T89C51AC2 4127G–8051–05/06 Figure 23. Hardware Programming Procedure Reading the Flash Spaces User The following procedure is used to read the User space: • Read one byte in Accumulator by executing MOVC A,@A+DPTR where A+DPTR is the address of the code byte to read. Note: FCON is supposed to be reset when not needed. Extra Row The following procedure is used to read the Extra Row space and is summarized in Figure 24: • Map the Extra Row space by writing 02h in FCON register. • Read one byte in Accumulator by executing MOVC A,@A+DPTR with A = 0 and DPTR = FF80h to FFFFh. • Clear FCON to unmap the Extra Row. Hardware Security Byte The following procedure is used to read the Hardware Security space and is summarized in Figure 24: • Map the Hardware Security space by writing 04h in FCON register. • Read the byte in Accumulator by executing MOVC A,@A+DPTR with A = 0 and DPTR = 0000h. • Clear FCON to unmap the Hardware Security Byte. Flash Spaces Programming Save and Disable IT EA = 0 Launch Programming FCON = 54h FCON = A4h End Programming RestoreIT FBusy Cleared? Clear Mode FCON = 00h Data Load DPTR = 00h ACC = Data Exec: MOVX @DPTR, A FCON = 0Ch Save and Disable IT EA = 0 End Loading Restore IT |
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