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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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DOC7707 데이터시트(PDF) 22 Page - List of Unclassifed Manufacturers |
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DOC7707 데이터시트(HTML) 22 Page - List of Unclassifed Manufacturers |
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22 / 307 page  22 7707F–AVR–11/10 AT90USB82/162 assume that no Flash Boot Loader is present in the software. If such code is present, the EEPROM write function must also wait for any ongoing SPM command to finish. Note: 1. See “About Code Examples” on page 7. Assembly Code Example (1) EEPROM_write: ; Wait for completion of previous write sbic EECR,EEPE rjmp EEPROM_write ; Set up address (r18:r17) in address register out EEARH, r18 out EEARL, r17 ; Write data (r16) to Data Register out EEDR,r16 ; Write logical one to EEMPE sbi EECR,EEMPE ; Start eeprom write by setting EEPE sbi EECR,EEPE ret C Code Example (1) void EEPROM_write(unsigned int uiAddress, unsigned char ucData) { /* Wait for completion of previous write */ while(EECR & (1<<EEPE)) ; /* Set up address and Data Registers */ EEAR = uiAddress; EEDR = ucData; /* Write logical one to EEMPE */ EECR |= (1<<EEMPE); /* Start eeprom write by setting EEPE */ EECR |= (1<<EEPE); } |
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