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ATmega169PV-8MCH 数据表(PDF) 104 Page - ATMEL Corporation |
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ATmega169PV-8MCH 数据表(HTML) 104 Page - ATMEL Corporation |
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104 / 393 page  104 8018N–AVR–08/09 ATmega169P The three Clock Select bits select the clock source to be used by the Timer/Counter. 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. 14.9.2 TCNT0 – 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 TCNT0 Register blocks (removes) the compare 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 OCR0A Register. 14.9.3 OCR0A – Output Compare Register A 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. 14.9.4 TIMSK0 – Timer/Counter 0 Interrupt Mask Register • Bit 1 – OCIE0A: Timer/Counter0 Output Compare Match A Interrupt Enable Table 14-6. Clock Select Bit Description CS02 CS01 CS00 Description 0 0 0 No clock source (Timer/Counter stopped) 001 clkI/O/(No prescaling) 010 clkI/O/8 (From prescaler) 011 clkI/O/64 (From prescaler) 100 clkI/O/256 (From prescaler) 101 clkI/O/1024 (From prescaler) 1 1 0 External clock source on T0 pin. Clock on falling edge. 1 1 1 External clock source on T0 pin. Clock on rising edge. Bit 765 432 10 0x26 (0x46) TCNT0[7:0] TCNT0 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 765 432 10 0x27 (0x47) OCR0A[7:0] OCR0A 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 7654 32 1 0 (0x6E) – – – – – –OCIE0A TOIE0 TIMSK0 Read/Write RRR RRR R/W R/W Initial Value 0000 00 0 0 |
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