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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega162 датащи(PDF) 110 Page - ATMEL Corporation |
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ATmega162 датащи(HTML) 110 Page - ATMEL Corporation |
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110 / 324 page  110 2513K–AVR–07/09 ATmega162/V The following code examples show how to do an atomic read of the TCNTn Register contents. Reading any of the OCRnA/B 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. Assembly Code Example(1) TIM16_ReadTCNT n: ; Save Global Inter?upt Flag in r18,SREG ; Disable interrupt? cli ; Read TCNT n into r17:r16 in r16,TCNT nL in r17,TCNT nH ; Restore Global In?errupt Flag out SREG,r18 ret C Code Example (1) unsigned int TIM16_ReadTCNT n( void ) { unsigned char sreg; unsigned int i; /* Save Global Inte?rupt Flag */ sreg = SREG; /* Disable interrup?s */ _CLI(); /* Read TCNT n into i */ i = TCNT n; /* Restore Global I?terrupt Flag */ SREG = sreg; return i; } |
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