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ATMEGA640 Datasheet(PDF) 186 Page - Microchip Technology |
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ATMEGA640 Datasheet(HTML) 186 Page - Microchip Technology |
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186 / 436 page  186 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. 20.10.3 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. Modify- ing the counter (TCNT2) while the counter is running, introduces a risk of missing a Compare Match between TCNT2 and the OCR2x Registers. 20.10.4 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. 20.10.5 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. 10 1 clkT2S/128 (From prescaler) 11 0 clkT2S/256 (From prescaler) 11 1 clkT2S/1024 (From prescaler) Table 20-9. Clock Select Bit Description (Continued) CS22 CS21 CS20 Description Bit 76543210 (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 00000000 Bit 76543210 (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 00000000 Bit 76543210 (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 00000000 |
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