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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega32HVB датащи(PDF) 93 Page - ATMEL Corporation |
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ATmega32HVB датащи(HTML) 93 Page - ATMEL Corporation |
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93 / 273 page  93 8042A–AVR–07/09 ATmega16HVB/32HVB The following code examples show how to do an atomic write of the TCNTnH/L register con- tents. Writing any of the OCRnA/B registers can be done by using the same principle. Note: See “About Code Examples” on page 8. The assembly code example requires that the r17:r16 register pair contains the value to be writ- ten to TCNTnH/L. 17.9.1 Reusing the temporary high byte register If writing to more than one 16-bit register where the high byte is the same for all registers written, then the high byte only needs to be written once. However, note that the same rule of atomic operation described previously also applies in this case. Assembly Code Example TIMn_WriteTCNTn: ; Save global interrupt flag in r18,SREG ; Disable interrupts cli ; Set TCNTn to r17:r16 out TCNTnH,r17 out TCNTnL,r16 ; Restore global interrupt flag out SREG,r18 ret C Code Example void TIMn_WriteTCNTn( unsigned int i ) { unsigned char sreg; unsigned int i; /* Save global interrupt flag */ sreg = SREG; /* Disable interrupts */ _CLI(); /* Set TCNTn to i */ TCNTn = i; /* Restore global interrupt flag */ SREG = sreg; } |
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