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ATmega16HVB データシート(PDF) 92 Page - ATMEL Corporation

部品番号 ATmega16HVB
部品情報  8-bit Microcontroller with 16K/32K Bytes In-System Programmable Flash
PDF  273 Pages
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メーカー  ATMEL [ATMEL Corporation]
ホームページ  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega16HVB データシート(HTML) 92 Page - ATMEL Corporation

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92
8042A–AVR–07/09
ATmega16HVB/32HVB
The following code examples show how to do an atomic read of the TCNTn register contents.
Reading any of the OCRn register can be done by using the same principle.
Note:
1. See “About Code Examples” on page 8.
The assembly code example returns the TCNTnH/L value in the r17:r16 register pair.
Assembly Code Example
TIMn_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
unsigned int
TIMn_ReadTCNTn( void )
{
unsigned char sreg;
unsigned int
i;
/* Save global interrupt flag */
sreg = SREG;
/* Disable interrupts */
_CLI();
/* Read TCNTn into i */
i = TCNTn;
/* Restore global interrupt flag */
SREG = sreg;
return
i;
}



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