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전자부품 데이터시트 검색엔진 |
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DSPIC30F6015T-30E/PT 데이터시트(PDF) 57 Page - Microchip Technology |
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DSPIC30F6015T-30E/PT 데이터시트(HTML) 57 Page - Microchip Technology |
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57 / 236 page  © 2007 Microchip Technology Inc. DS70150C-page 55 dsPIC30F6010A/6015 7.3 Writing to the Data EEPROM To write an EEPROM data location, the following sequence must be followed: 1. Erase data EEPROM word. a) Select word, data EEPROM, erase and set WREN bit in NVMCON register. b) Write address of word to be erased into NVMADRU/NVMADR. c) Enable NVM interrupt (optional). d) Write ‘55’ to NVMKEY. e) Write ‘AA’ to NVMKEY. f) Set the WR bit. This will begin erase cycle. g) Either poll NVMIF bit or wait for NVMIF interrupt. h) The WR bit is cleared when the erase cycle ends. 2. Write data word into data EEPROM write latches. 3. Program 1 data word into data EEPROM. a) Select word, data EEPROM, program and set WREN bit in NVMCON register. b) Enable NVM write done interrupt (optional). c) Write ‘55’ to NVMKEY. d) Write ‘AA’ to NVMKEY. e) Set the WR bit. This will begin program cycle. f) Either poll NVMIF bit or wait for NVM interrupt. g) The WR bit is cleared when the write cycle ends. The write will not initiate if the above sequence is not exactly followed (write 0x55 to NVMKEY, write 0xAA to NVMCON, then set WR bit) for each word. It is strongly recommended that interrupts be disabled during this code segment. Additionally, the WREN bit in NVMCON must be set to enable writes. This mechanism prevents accidental writes to data EEPROM, due to unexpected code exe- cution. The WREN bit should be kept clear at all times, except when updating the EEPROM. The WREN bit is not cleared by hardware. After a write sequence has been initiated, clearing the WREN bit will not affect the current write cycle. The WR bit will be inhibited from being set unless the WREN bit is set. The WREN bit must be set on a previous instruc- tion. Both WR and WREN cannot be set with the same instruction. At the completion of the write cycle, the WR bit is cleared in hardware and the Nonvolatile Memory Write Complete Interrupt Flag bit (NVMIF) is set. The user may either enable this interrupt, or poll this bit. NVMIF must be cleared by software. 7.3.1 WRITING A WORD OF DATA EEPROM Once the user has erased the word to be programmed, then a table write instruction is used to write one write latch, as shown in Example 7-4. EXAMPLE 7-4: DATA EEPROM WORD WRITE ; Point to data memory MOV #LOW_ADDR_WORD,W0 ; Init pointer MOV #HIGH_ADDR_WORD,W1 MOV W1,TBLPAG MOV #LOW(WORD),W2 ; Get data TBLWTL W2,[ W0] ; Write data ; The NVMADR captures last table access address ; Select data EEPROM for 1 word op MOV #0x4004,W0 MOV W0,NVMCON ; Operate key to allow write 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 ; Initiate program sequence NOP NOP ; Write cycle will complete in 2mS. CPU is not stalled for the Data Write Cycle ; User can poll WR bit, use NVMIF or Timer IRQ to determine write complete |
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