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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega644PA датащи(PDF) 28 Page - ATMEL Corporation |
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ATmega644PA датащи(HTML) 28 Page - ATMEL Corporation |
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28 / 468 page  28 8152G–AVR–11/09 ATmega164PA/324PA/644PA/1284P The next code examples show assembly and C functions for reading the EEPROM. The exam- ples assume that interrupts are controlled so that no interrupts will occur during execution of these functions. Note: 1. See “About Code Examples” on page 9. Assembly Code Example (1) EEPROM_read: ; Wait for completion of previous write sbic EECR,EEPE rjmp EEPROM_read ; Set up address (r18:r17) in address register out EEARH, r18 out EEARL, r17 ; Start eeprom read by writing EERE sbi EECR,EERE ; Read data from Data Register in r16,EEDR ret C Code Example (1) unsigned char EEPROM_read(unsigned int uiAddress) { /* Wait for completion of previous write */ while(EECR & (1<<EEPE)) ; /* Set up address register */ EEAR = uiAddress; /* Start eeprom read by writing EERE */ EECR |= (1<<EERE); /* Return data from Data Register */ return EEDR; } |
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