參數(shù)資料
型號: R5F6418JADFE
元件分類: 微控制器/微處理器
英文描述: MICROCONTROLLER, PQFP176
封裝: 24 X 24 MM, 0.50 MM PITCH, PLASTIC, LQFP-176
文件頁數(shù): 3/128頁
文件大?。?/td> 922K
代理商: R5F6418JADFE
101
ATmega48PA/88PA/168PA [DATASHEET]
9223F–AVR–04/14
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.
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 */
_CLI();
/* Read TCNT
1 into i */
i = TCNT
1;
/* Restore global interrupt flag */
SREG = sreg;
return
i;
}
Note:
1.
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”.
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