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ATtiny261A Datasheet(PDF) 109 Page - ATMEL Corporation |
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ATtiny261A Datasheet(HTML) 109 Page - ATMEL Corporation |
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109 / 292 page  109 8197A–AVR–10/09 ATtiny261A/461A/861A The following code examples show how to do an atomic write of the TCNT1 register contents. Writing any of the OCR1A/B/C/D registers can be done by using the same principle. Note: See “Code Examples” on page 6. The assembly code example requires that the r17:r16 register pair contains the value to be writ- ten to TCNT1. Assembly Code Example TIM1_WriteTCNT 1: ; Save global interrupt flag in r18,SREG ; Disable interrupts cli ; Set TCNT 1 to r17:r16 out TC 1H,r17 out TCNT 1,r16 ; Restore global interrupt flag out SREG,r18 ret C Code Example void TIM1_WriteTCNT1( unsigned int i ) { unsigned char sreg; unsigned int i; /* Save global interrupt flag */ sreg = SREG; /* Disable interrupts */ _CLI(); /* Set TCNT1 to i */ TC1H = (i >> 8); TCNT1 = (unsigned char)i; /* Restore global interrupt flag */ SREG = sreg; } |
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