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ATmega16-16PU датащи(PDF) 94 Page - ATMEL Corporation |
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ATmega16-16PU датащи(HTML) 94 Page - ATMEL Corporation |
94 / 357 page 94 2466S–AVR–05/09 ATmega16(L) 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 7. The assembly code example requires that the r17:r16 register pair contains the value to be writ- ten 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 writ- ten, 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. Timer/Counter Clock Sources The Timer/Counter can be clocked by an internal or an external clock source. The clock source is selected by the Clock Select logic which is controlled by the Clock Select (CS12:0) bits located in the Timer/Counter Control Register B (TCCR1B). For details on clock sources and prescaler, see “Timer/Counter0 and Timer/Counter1 Prescalers” on page 87. Assembly Code Example (1) TIM16_WriteTCNT1: ; Save global interrupt flag in r18,SREG ; Disable interrupts cli ; Set TCNT1 to r17:r16 out TCNT1H,r17 out TCNT1L,r16 ; Restore global interrupt flag out SREG,r18 ret C Code Example(1) void TIM16_WriteTCNT1 ( unsigned int i ) { unsigned char sreg; unsigned int i; /* Save global interrupt flag */ sreg = SREG; /* Disable interrupts */ _CLI(); /* Set TCNT1 to i */ TCNT1 = i; /* Restore global interrupt flag */ SREG = sreg; } |
Аналогичный номер детали - ATmega16-16PU |
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Аналогичное описание - ATmega16-16PU |
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