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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega128 датащи(PDF) 137 Page - ATMEL Corporation |
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ATmega128 датащи(HTML) 137 Page - ATMEL Corporation |
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137 / 386 page  137 2467S–AVR–07/09 ATmega128 If external pin modes are used for the Timer/Countern, transitions on the Tn pin will clock the counter even if the pin is configured as an output. This feature allows software control of the counting. Timer/Counter1 Control Register C – TCCR1C Timer/Counter3 Control Register C – TCCR3C • Bit 7 – FOCnA: Force Output Compare for Channel A • Bit 6 – FOCnB: Force Output Compare for Channel B • Bit 5 – FOCnC: Force Output Compare for Channel C The FOCnA/FOCnB/FOCnC bits are only active when the WGMn3:0 bits specifies a non-PWM mode. When writing a logical one to the FOCnA/FOCnB/FOCnC bit, an immediate compare match is forced on the waveform generation unit. The OCnA/OCnB/OCnC output is changed according to its COMnx1:0 bits setting. Note that the FOCnA/FOCnB/FOCnC bits are imple- mented as strobes. Therefore it is the value present in the COMnx1:0 bits that determine the effect of the forced compare. A FOCnA/FOCnB/FOCnC strobe will not generate any interrupt nor will it clear the timer in Clear Timer on Compare Match (CTC) mode using OCRnA as TOP. The FOCnA/FOCnB/FOCnB bits are always read as zero. • Bit 4:0 – Reserved Bits These bits are reserved for future use. For ensuring compatibility with future devices, these bits must be written to zero when TCCRnC is written. Table 62. Clock Select Bit Description CSn2 CSn1 CSn0 Description 0 0 0 No clock source. (Timer/Counter stopped) 001 clkI/O/1 (No prescaling 010 clk I/O/8 (From prescaler) 011 clkI/O/64 (From prescaler) 100 clkI/O/256 (From prescaler) 101 clk I/O/1024 (From prescaler) 1 1 0 External clock source on Tn pin. Clock on falling edge 1 1 1 External clock source on Tn pin. Clock on rising edge Bit 765 4321 0 FOC1A FOC1B FOC1C –––– – TCCR1C Read/Write W W W R R R R R Initial Value 000 0000 0 Bit 765 4321 0 FOC3A FOC3B FOC3C –––– – TCCR3C Read/Write W W W R R R R R Initial Value 000 0000 0 |
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