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ATTINY2313-20MU データシート(Datasheet) 90 Page - ATMEL Corporation

部品番号. ATTINY2313-20MU
部品情報  8-bit Microcontroller with 2K Bytes In-System Programmable Flash
ダウンロード  231 Pages
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メーカー  ATMEL [ATMEL Corporation]
ホームページ  http://www.atmel.com
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 90 page
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90
ATtiny2313/V
2543I–AVR–04/06
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.
For I/O Registers located in extended I/O map, “IN”, “OUT”, “SBIS”, “SBIC”, “CBI”,
and “SBI” instructions must be replaced with instructions that allow access to
extended I/O. Typically “LDS” and “STS” combined with “SBRS”, “SBRC”, “SBR”, and
“CBR”.
The assembly code example returns the TCNT1 value in the r17:r16 register pair.
Assembly Code Example(1)
TIM16_ReadTCNT
1:
; Save global interrupt flag
in
r18,SREG
; Disable interrupts
cli
; Read TCNT
1 into r17:r16
in
r16,TCNT
1L
in
r17,TCNT
1H
; Restore global interrupt flag
out
SREG,r18
ret
C Code Example
(1)
unsigned int
TIM16_ReadTCNT
1( void )
{
unsigned char
sreg;
unsigned int
i;
/* Save global interrupt flag */
sreg = SREG;
/* Disable interrupts */
__disable_interrupt();
/* Read TCNT
1 into i */
i = TCNT
1;
/* Restore global interrupt flag */
SREG = sreg;
return
i;
}




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