Rainbow-electronics ATmega64L Manuel d'utilisateur télécharger pdf (Page 87)

100

101

ATmega16(L)

2466B–09/01

The following code examples show how to do an atomic read of the TCNT1 register con-

tents. 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 = TCNT1;

/* Restore global interrupt flag */

SREG = sreg;

return i;

}

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Rainbow-electronics ATmega64L Manuel d'utilisateur Page 87

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