ATmega325P datasheet(111/364 Pages) ATMEL

Numer części	ATmega325P

Szczegółowy opis	8-bit Microcontroller with 32K Bytes In-System Programmable Flash

PDF	364 Pages

Scroll/Zoom	100%

Producent	ATMEL [ATMEL Corporation]

Strona internetowa	http://www.atmel.com

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111 / 364 page

111

8023F–AVR–07/09

ATmega325P/3250P

the main code and the interrupt code update the temporary register, the main code must disable

the interrupts during the 16-bit access.

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. See Section “5.” on page 10.

The assembly code example returns the TCNT1 value in the r17:r16 register pair.

Assembly Code Example(1)

TIM16_ReadTCNT

; Save global interrupt flag

r18,SREG

; Disable interrupts

cli

; Read TCNT

1 into r17:r16

r16,TCNT

r17,TCNT

; Restore global interrupt flag

out

SREG,r18

ret

C Code Example

(1)

unsigned int

TIM16_ReadTCNT

1( void )

{

unsigned char

sreg;

unsigned int

/* Save global interrupt flag */

sreg = SREG;

/* Disable interrupts */

__disable_interrupt();

/* Read TCNT

1 into i */

i = TCNT

/* Restore global interrupt flag */

SREG = sreg;

return

}

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