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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATMEGA640 датащи(PDF) 130 Page - Microchip Technology |
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ATMEGA640 датащи(HTML) 130 Page - Microchip Technology |
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130 / 436 page  130 ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET] DS40002211A 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. 16.9.3 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. Modify- ing the counter (TCNT0) while the counter is running, introduces a risk of missing a Compare Match between TCNT0 and the OCR0x Registers. 16.9.4 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. 16.9.5 OCR0B – Output Compare Register B The Output Compare Register B 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 OC0B pin. Table 16-9. 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 76543 210 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 00000 000 Bit 76543 210 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 00000 000 Bit 76543 210 0x28 (0x48) OCR0B[7:0] OCR0B Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 00000 000 |
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