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ATmega32U2 Datasheet(PDF) 106 Page - ATMEL Corporation |
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ATmega32U2 Datasheet(HTML) 106 Page - ATMEL Corporation |
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106 / 314 page  106 7799B–AVR–07/09 ATmega8U2/16U2/32U2 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. 15.9.3 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. Modifying the counter (TCNT0) while the counter is running, introduces a risk of missing a Compare Match between TCNT0 and the OCR0x Registers. 15.9.4 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. 15.9.5 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. 15.9.6 TIMSK0 – Timer/Counter Interrupt Mask Register • Bits 7:3 – Res: Reserved Bits These bits are reserved bits and will always read as zero. 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. Table 15-9. Clock Select Bit Description (Continued) CS02 CS01 CS00 Description Bit 76543210 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 00000000 Bit 76543210 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 00000000 Bit 76543210 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 00000000 Bit 7654 3 2 1 0 (0x6E) –––– – OCIE0B OCIE0A TOIE0 TIMSK0 Read/Write RR RR R R/W R/W R/W Initial Value 0000 0 0 0 0 |
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