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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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ATmega16HVB 데이터시트(PDF) 92 Page - ATMEL Corporation |
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ATmega16HVB 데이터시트(HTML) 92 Page - ATMEL Corporation |
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92 / 273 page  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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