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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) 159 Page - ATMEL Corporation |
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ATmega128 датащи(HTML) 159 Page - ATMEL Corporation |
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159 / 386 page  159 2467S–AVR–07/09 ATmega128 If external pin modes are used for the Timer/Counter2, transitions on the T2 pin will clock the counter even if the pin is configured as an output. This feature allows software control of the counting. Timer/Counter Register – TCNT2 The Timer/Counter Register gives direct access, both for read and write operations, to the Timer/Counter unit 8-bit counter. Writing to the TCNT2 Register blocks (removes) the compare match on the following timer clock. Modifying the counter (TCNT2) while the counter is running, introduces a risk of missing a compare match between TCNT2 and the OCR2 Register. Output Compare Register – OCR2 The Output Compare Register contains an 8-bit value that is continuously compared with the counter value (TCNT2). A match can be used to generate an output compare interrupt, or to generate a waveform output on the OC2 pin. Timer/Counter Interrupt Mask Register – TIMSK • Bit 7 – OCIE2: Timer/Counter2 Output Compare Match Interrupt Enable When the OCIE2 bit is written to one, and the I-bit in the Status Register is set (one), the Timer/Counter2 Compare Match interrupt is enabled. The corresponding interrupt is executed if a compare match in Timer/Counter2 occurs, i.e., when the OCF2 bit is set in the Timer/Counter Interrupt Flag Register – TIFR. • Bit 6 – TOIE2: Timer/Counter2 Overflow Interrupt Enable When the TOIE2 bit is written to one, and the I-bit in the Status Register is set (one), the Timer/Counter2 Overflow interrupt is enabled. The corresponding interrupt is executed if an overflow in Timer/Counter2 occurs, i.e., when the TOV2 bit is set in the Timer/Counter Interrupt Flag Register – TIFR. 101 clkI/O/1024 (From prescaler) 1 1 0 External clock source on T2 pin. Clock on falling edge 1 1 1 External clock source on T2 pin. Clock on rising edge Table 68. Clock Select Bit Description CS22 CS21 CS20 Description Bit 765 4321 0 TCNT2[7:0] TCNT2 Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 000 0000 0 Bit 765 4321 0 OCR2[7:0] OCR2 Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 000 0000 0 Bit 765 4 3 210 OCIE2 TOIE2 TICIE1 OCIE1A OCIE1B TOIE1 OCIE0 TOIE0 TIMSK Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 0 0 0 0 0 0 0 0 |
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