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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega165 датащи(PDF) 96 Page - ATMEL Corporation |
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ATmega165 датащи(HTML) 96 Page - ATMEL Corporation |
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96 / 336 page  96 ATmega165/V 2573G–AVR–07/09 The following code examples show how to do an atomic write of the TCNT1 Register contents. Writing any of the OCR1A/B or ICR1 Registers can be done by using the same principle. Note: 1. See “About Code Examples” on page 6. The assembly code example requires that the r17:r16 register pair contains the value to be written to TCNT1. 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(1) TIM16_WriteTCNT 1: ; Save global interrupt flag in r18,SREG ; Disable interrupts cli ; Set TCNT 1 to r17:r16 out TCNT 1H,r17 out TCNT 1L,r16 ; Restore global interrupt flag out SREG,r18 ret C Code Example (1) void TIM16_WriteTCNT 1( unsigned int i ) { unsigned char sreg; unsigned int i; /* Save global interrupt flag */ sreg = SREG; /* Disable interrupts */ __disable_interrupt(); /* Set TCNT 1 to i */ TCNT 1 = i; /* Restore global interrupt flag */ SREG = sreg; } |
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