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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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ATmega16 Arkusz danych(PDF) 93 Page - ATMEL Corporation |
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ATmega16 Arkusz danych(HTML) 93 Page - ATMEL Corporation |
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93 / 357 page  93 2466S–AVR–05/09 ATmega16(L) The following code examples show how to do an atomic read of the TCNT1 Register contents. Reading any of the OCR1A/B or ICR1 Registers can be done by using the same principle. Note: 1. See “About Code Examples” on page 7. The assembly code example returns the TCNT1 value in the r17:r16 register pair. Assembly Code Example (1) TIM16_ReadTCNT1: ; Save global interrupt flag in r18,SREG ; Disable interrupts cli ; Read TCNT1 into r17:r16 in r16,TCNT1L in r17,TCNT1H ; Restore global interrupt flag out SREG,r18 ret C Code Example(1) unsigned int TIM16_ReadTCNT1( void ) { unsigned char sreg; unsigned int i; /* Save global interrupt flag */ sreg = SREG; /* Disable interrupts */ _CLI(); /* Read TCNT1 into i */ i = TCNT1; /* Restore global interrupt flag */ SREG = sreg; return i; } |
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