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DSPIC30F5015 Datasheet(PDF) 60 Page - Microchip Technology |
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DSPIC30F5015 Datasheet(HTML) 60 Page - Microchip Technology |
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60 / 230 page  dsPIC30F5015/5016 DS70149C-page 58 © 2007 Microchip Technology Inc. 7.3.2 WRITING A BLOCK OF DATA EEPROM To write a block of data EEPROM, write to all sixteen latches first, then set the NVMCON register and program the block. EXAMPLE 7-5: DATA EEPROM BLOCK WRITE 7.4 Write Verify Depending on the application, good programming practice may dictate that the value written to the mem- ory should be verified against the original value. This should be used in applications where excessive writes can stress bits near the specification limit. 7.5 Protection Against Spurious Write There are conditions when the device may not want to write to the data EEPROM memory. To protect against spurious EEPROM writes, various mechanisms have been built-in. On power-up, the WREN bit is cleared; also, the Power-up Timer prevents EEPROM write. The write initiate sequence and the WREN bit together help prevent an accidental write during brown-out, power glitch or software malfunction. MOV #LOW_ADDR_WORD,W0 ; Init pointer MOV #HIGH_ADDR_WORD,W1 MOV W1,TBLPAG MOV #data1,W2 ; Get 1st data TBLWTL W2,[ W0]++ ; write data MOV #data2,W2 ; Get 2nd data TBLWTL W2,[ W0]++ ; write data MOV #data3,W2 ; Get 3rd data TBLWTL W2,[ W0]++ ; write data MOV #data4,W2 ; Get 4th data TBLWTL W2,[ W0]++ ; write data MOV #data5,W2 ; Get 5th data TBLWTL W2,[ W0]++ ; write data MOV #data6,W2 ; Get 6th data TBLWTL W2,[ W0]++ ; write data MOV #data7,W2 ; Get 7th data TBLWTL W2,[ W0]++ ; write data MOV #data8,W2 ; Get 8th data TBLWTL W2,[ W0]++ ; write data MOV #data9,W2 ; Get 9th data TBLWTL W2,[ W0]++ ; write data MOV #data10,W2 ; Get 10th data TBLWTL W2,[ W0]++ ; write data MOV #data11,W2 ; Get 11th data TBLWTL W2,[ W0]++ ; write data MOV #data12,W2 ; Get 12th data TBLWTL W2,[ W0]++ ; write data MOV #data13,W2 ; Get 13th data TBLWTL W2,[ W0]++ ; write data MOV #data14,W2 ; Get 14th data TBLWTL W2,[ W0]++ ; write data MOV #data15,W2 ; Get 15th data TBLWTL W2,[ W0]++ ; write data MOV #data16,W2 ; Get 16th data TBLWTL W2,[ W0]++ ; write data. The NVMADR captures last table access address. MOV #0x400A,W0 ; Select data EEPROM for multi word op MOV W0,NVMCON ; Operate Key to allow program operation DISI #5 ; Block all interrupts with priority <7 ; for next 5 instructions MOV #0x55,W0 MOV W0,NVMKEY ; Write the 0x55 key MOV #0xAA,W1 MOV W1,NVMKEY ; Write the 0xAA key BSET NVMCON,#WR ; Start write cycle NOP NOP |
Similar Part No. - DSPIC30F5015_07 |
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Similar Description - DSPIC30F5015_07 |
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