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ATMEGA8 Datasheet(PDF) 78 Page - ATMEL Corporation |
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ATMEGA8 Datasheet(HTML) 78 Page - ATMEL Corporation |
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78 / 303 page  78 ATmega8(L) 2486M–AVR–12/03 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. The example code assumes that the part specific header file is included. 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 = TCNT 1; /* Restore Global Interrupt Flag */ SREG = sreg; return i; } |
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