ATMEGA8U2_14 Datasheet, PDF(112/310 Page) ATMEL Corporation – 125 Powerful Instructions – Most Single Clock Cycle Execution

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ATMEGA8U2_14 Datasheet, PDF (112/310 Pages) ATMEL Corporation – 125 Powerful Instructions – Most Single Clock Cycle Execution

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ATmega8U2/16U2/32U2

Assembly Code Example(1)

TIM16_ReadTCNTn:

; Save global interrupt flag

in r18,SREG

; Disable interrupts

cli

; Read TCNTn into r17:r16

in r16,TCNTnL

in r17,TCNTnH

; Restore global interrupt flag

out SREG,r18

ret

C Code Example(1)

unsigned int TIM16_ReadTCNTn( void )

{

unsigned char sreg;

unsigned int i;

/* Save global interrupt flag */

sreg = SREG;

/* Disable interrupts */

__disable_interrupt();

/* Read TCNTn into i */

i = TCNTn;

/* Restore global interrupt flag */

SREG = sreg;

return i;

}

Note: 1. See âCode Examplesâ on page 6.

The assembly code example returns the TCNTn value in the r17:r16 register pair.

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