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T89C5115-RATIM bảng dữ liệu(PDF) 38 Page - ATMEL Corporation |
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T89C5115-RATIM bảng dữ liệu(HTML) 38 Page - ATMEL Corporation |
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38 / 113 page ![]() 38 AT89C5115 4128G–8051–02/08 Figure 16. 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 with A+DPTR is the address of the code byte to read. Note: FCON must be cleared (00h) when not used. Extra Row The following procedure is used to read the Extra Row space and is summarized in Figure 17: • 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 & DPTR= FF80h to FFFFh. • Clear FCON to unmap the Extra Row. Hardware Security Byte The following procedure is used to read the Hardware Security Byte and is sum- marized in Figure 17: • 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 & DPTR= 0000h. • Clear FCON to unmap the Hardware Security Byte. Flash Spaces Programming Save & 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 & Disable IT EA = 0 End Loading Restore IT |
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