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AT90USB646 Datasheet(PDF) 165 Page - ATMEL Corporation |
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AT90USB646 Datasheet(HTML) 165 Page - ATMEL Corporation |
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165 / 434 page  165 7593A–AVR–02/06 AT90USB64/128 • Bit 3 – WGM22: Waveform Generation Mode See the description in the “Timer/Counter Control Register A – TCCR2A” on page 161. • 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 15-8. 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. 15.8.3 Timer/Counter Register – TCNT2 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. 15.8.4 Output Compare Register A – OCR2A 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. 15.8.5 Output Compare Register B – OCR2B Table 15-8. 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 clk T 2S/256 (From prescaler) 111 clkT2S/1024 (From prescaler) Bit 7654 32 1 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 0000 00 0 0 Bit 7654 32 1 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 0000 00 0 0 Bit 7654 32 1 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 0000 00 0 0 |
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