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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega328P датащи(PDF) 162 Page - ATMEL Corporation |
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ATmega328P датащи(HTML) 162 Page - ATMEL Corporation |
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162 / 448 page  162 8161D–AVR–10/09 ATmega48PA/88PA/168PA/328P If external pin modes are used for the Timer/Counter0, transitions on the T0 pin will clock the counter even if the pin is configured as an output. This feature allows software control of the counting. 17.11.3 TCNT2 – Timer/Counter Register 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 OCR2x Registers. 17.11.4 OCR2A – Output Compare Register A The Output Compare Register A 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 OC2A pin. 17.11.5 OCR2B – Output Compare Register B The Output Compare Register B 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 OC2B pin. Table 17-9. Clock Select Bit Description CS22 CS21 CS20 Description 0 0 0 No clock source (Timer/Counter stopped). 001 clkT2S/(No prescaling) 010 clkT2S/8 (From prescaler) 011 clkT2S/32 (From prescaler) 100 clkT2S/64 (From prescaler) 101 clkT2S/128 (From prescaler) 110 clkT2S/256 (From prescaler) 111 clk T 2S/1024 (From prescaler) Bit 7 65 43 21 0 (0xB2) TCNT2[7:0] TCNT2 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 Bit 7 654 32 10 (0xB3) OCR2A[7:0] OCR2A 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 Bit 7 654 32 10 (0xB4) OCR2B[7:0] OCR2B 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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