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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATtiny167 датащи(PDF) 103 Page - ATMEL Corporation |
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ATtiny167 датащи(HTML) 103 Page - ATMEL Corporation |
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103 / 282 page  103 7728D–AVR–07/09 ATtiny87/ATtiny167 The three Clock Select bits select the clock source to be used by the Timer/Counter, see Table 10-5. 10.11.2 Timer/Counter0 Register – TCNT0 The Timer/Counter Register gives direct access, both for read and write operations, to the Timer/Counter unit 8-bit counter. Writing to the TCNT0 Register blocks (removes) the Com- pare Match on the following timer clock. Modifying the counter (TCNT0) while the counter is running, introduces a risk of missing a Compare Match between TCNT0 and the OCR0x Register. 10.11.3 Output Compare Register A – OCR0A The Output Compare Register A contains an 8-bit value that is continuously compared with the counter value (TCNT0). A match can be used to generate an Output Compare interrupt, or to generate a waveform output on the OC0A pin. 10.11.4 Asynchronous Status Register – ASSR • Bit 7 – Res: Reserved Bit This bit is reserved in the ATtiny87/167 and will always read as zero. • Bit 6 – EXCLK: Enable External Clock Input When EXCLK is written to one, and asynchronous clock is selected, the external clock input buffer is enabled and an external clock can be input on XTAL1 pin instead of an external crys- tal. Writing to EXCLK should be done before asynchronous operation is selected. Note that the crystal oscillator will only run when this bit is zero. Table 10-5. Clock Select Bit Description CS02 CS01 CS00 Description 0 0 0 No clock source (Timer/Counter stopped). 001 clkT0S (No prescaling) 010 clkT0S/8 (From prescaler) 011 clkT0S/32 (From prescaler) 100 clkT0S/64 (From prescaler) 101 clkT0S/128 (From prescaler) 110 clk T0S/256 (From prescaler) 111 clk T0S/1024 (From prescaler) Bit 7654 3210 TCNT07 TCNT06 TCNT05 TCNT04 TCNT03 TCNT02 TCNT01 TCNT00 TCNT0 Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 0000 0000 Bit 7654 3210 OCR0A7 OCR0A6 OCR0A5 OCR0A4 OCR0A3 OCR0A2 OCR0A1 OCR0A0 OCR0A Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 0000 0000 Bit 7 6 5 4 321 0 – EXCLK AS0 TCN0UB OCR0AUB – TCR0AUB TCR0BUB ASSR Read/Write R R/W R/W R R R R R Initial Value 0 0 0 0 0 0 0 0 |
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