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AT90USB646 Datasheet(PDF) 160 Page - ATMEL Corporation |
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AT90USB646 Datasheet(HTML) 160 Page - ATMEL Corporation |
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160 / 456 page  160 7593L–AVR–09/12 AT90USB64/128 • 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 16-8. 16.8.3 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. Modifying the counter (TCNT2) while the counter is running, introduces a risk of missing a Compare Match between TCNT2 and the OCR2x Registers. 16.8.4 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. 16.8.5 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. Table 16-8. Clock Select bit description. CS22 CS21 CS20 Description 0 0 0 No clock source (Timer/Counter stopped) 001 clkT2S/(no prescaling) 010 clkT2S/8 (from prescaler) 011 clkT2S/32 (from prescaler) 100 clkT2S/64 (from prescaler) 101 clkT2S/128 (from prescaler) 110 clkT2S/256 (from prescaler) 111 clk T 2S/1024 (from prescaler) Bit 7 65 43 21 0 TCNT2[7:0] TCNT2 Read/write R/W R/W R/W R/W R/W R/W R/W R/W Initial value 00 00 00 00 Bit 7 65 43 21 0 OCR2A[7:0] OCR2A Read/write R/W R/W R/W R/W R/W R/W R/W R/W Initial value 00 00 00 00 Bit 7 65 43 21 0 OCR2B[7:0] OCR2B Read/write R/W R/W R/W R/W R/W R/W R/W R/W Initial value 00 00 00 00 |
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