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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega325P датащи(PDF) 151 Page - ATMEL Corporation |
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ATmega325P датащи(HTML) 151 Page - ATMEL Corporation |
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151 / 364 page  151 8023F–AVR–07/09 ATmega325P/3250P • Bit 2:0 – CS22:0: Clock Select The three Clock Select bits select the clock source to be used by the Timer/Counter, see Table 16-6. 16.10.2 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 OCR2A Register. 16.10.3 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. 16.10.4 ASSR – Asynchronous Status Register Table 16-6. Clock Select Bit Description CS22 CS21 CS20 Description 0 0 0 No clock source (Timer/Counter stopped). 00 1 clkT2S/(No prescaling) 01 0 clkT2S/8 (From prescaler) 01 1 clkT2S/32 (From prescaler) 10 0 clkT2S/64 (From prescaler) 10 1 clkT2S/128 (From prescaler) 11 0 clkT2S/256 (From prescaler) 11 1 clkT2S/1024 (From prescaler) Bit 765 4321 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 000 0000 0 Bit 765 4321 0 (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 000 0000 0 Bit 7 6 543 2 1 0 (0xB6) – – – EXCLK AS2 TCN2UB OCR2UB TCR2UB ASSR Read/Write R R R R/W R/W R R R Initial Value 0 0 0 0 0 0 0 0 |
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