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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega328P датащи(PDF) 117 Page - ATMEL Corporation |
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ATmega328P датащи(HTML) 117 Page - ATMEL Corporation |
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117 / 448 page  117 8161D–AVR–10/09 ATmega48PA/88PA/168PA/328P Note: 1. See ”About Code Examples” on page 7. For I/O Registers located in extended I/O map, “IN”, “OUT”, “SBIS”, “SBIC”, “CBI”, and “SBI” instructions must be replaced with instructions that allow access to extended I/O. Typically “LDS” and “STS” combined with “SBRS”, “SBRC”, “SBR”, and “CBR”. The assembly code example returns the TCNT1 value in the r17:r16 register pair. The following code examples show how to do an atomic write of the TCNT1 Register contents. Writing any of the OCR1A/B or ICR1 Registers can be done by using the same principle. Assembly Code Example(1) TIM16_ReadTCNT 1: ; Save global interrupt flag in r18,SREG ; Disable interrupts cli ; Read TCNT 1 into r17:r16 in r16,TCNT 1L in r17,TCNT 1H ; Restore global interrupt flag out SREG,r18 ret C Code Example (1) unsigned int TIM16_ReadTCNT 1( void ) { unsigned char sreg; unsigned int i; /* Save global interrupt flag */ sreg = SREG; /* Disable interrupts */ _CLI(); /* Read TCNT 1 into i */ i = TCNT 1; /* Restore global interrupt flag */ SREG = sreg; return i; } |
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