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ATtiny261A Datasheet(PDF) 80 Page - ATMEL Corporation |
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ATtiny261A Datasheet(HTML) 80 Page - ATMEL Corporation |
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80 / 292 page  80 8197A–AVR–10/09 ATtiny261A/461A/861A The following code examples show how to do an atomic read of the TCNT0 register contents. Reading any of the OCR0 register can be done by using the same principle. Note: See “Code Examples” on page 6. The assembly code example returns the TCNT0H/L value in the r17:r16 register pair. Assembly Code Example TIM0_ReadTCNT 0: ; Save global interrupt flag in r18,SREG ; Disable interrupts cli ; Read TCNT 0 into r17:r16 in r16,TCNT 0L in r17,TCNT 0H ; Restore global interrupt flag out SREG,r18 ret C Code Example unsigned int TIM0_ReadTCNT0( void ) { unsigned char sreg; unsigned int i; /* Save global interrupt flag */ sreg = SREG; /* Disable interrupts */ _CLI(); /* Read TCNT0 into i */ i = TCNT0L; i |= ((unsigned int)TCNT0H << 8); /* Restore global interrupt flag */ SREG = sreg; return i; } |
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