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ATmega16-16PU Arkusz danych(PDF) 93 Page - ATMEL Corporation

Numer części ATmega16-16PU
Szczegółowy opis  8-bit Microcontroller with 16K Bytes In-Syustem Programmable Flash
Download  357 Pages
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Producent  ATMEL [ATMEL Corporation]
Strona internetowa  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega16-16PU Arkusz danych(HTML) 93 Page - ATMEL Corporation

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2466S–AVR–05/09
ATmega16(L)
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 “About Code Examples” on page 7.
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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