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參數(shù)資料
| 型號(hào)： | R5F3650NNFB |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | MICROCONTROLLER, PQFP100 |
| 封裝： | 14 X 14 MM, 0.50 MM PITCH, LQFP-100 |
| 文件頁(yè)數(shù)： | 10/81頁(yè) |
| 文件大?。?/td> | 879K |
| 代理商： | R5F3650NNFB |
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108
4317K–AVR–03/2013
AT90PWM2/3/2B/3B
The following code examples show how to do an atomic read of the TCNTn Register contents.
Reading any of the OCRnx or ICRn 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 TCNTn value in the r17:r16 register pair.
TABLE 4.
Assembly Code Example(1)
TIM16_ReadTCNT
n:
; Save global interrupt flag
in
r18,SREG
; Disable interrupts
cli
; Read TCNT
n into r17:r16
in
r16,TCNT
nL
in
r17,TCNT
nH
; Restore global interrupt flag
out
SREG,r18
ret
C Code Example
unsigned int
TIM16_ReadTCNT
n( void )
{
unsigned char
sreg;
unsigned int
i;
/* Save global interrupt flag */
sreg = SREG;
/* Disable interrupts */
_CLI();
/* Read TCNT
n into i */
i = TCNT
n;
/* Restore global interrupt flag */
SREG = sreg;
return
i;
}
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