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AT90USB646 Datasheet(PDF) 113 Page - ATMEL Corporation |
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AT90USB646 Datasheet(HTML) 113 Page - ATMEL Corporation |
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113 / 459 page  113 7593H–AVR–11/08 ATmega32U6/AT90USB64/128 Note: 1. A special case occurs when OCR0B equals TOP and COM0B1 is set. In this case, the Com- pare Match is ignored, but the set or clear is done at TOP. See “Phase Correct PWM Mode” on page 108 for more details. • Bits 3, 2 – Res: Reserved Bits These bits are reserved bits in the ATmega32U6/AT90USB64/128 and will always read as zero. • Bits 1:0 – WGM01:0: Waveform Generation Mode Combined with the WGM02 bit found in the TCCR0B Register, these bits control the counting sequence of the counter, the source for maximum (TOP) counter value, and what type of wave- form generation to be used, see Table 13-7. Modes of operation supported by the Timer/Counter unit are: Normal mode (counter), Clear Timer on Compare Match (CTC) mode, and two types of Pulse Width Modulation (PWM) modes (see “Modes of Operation” on page 105). Notes: 1. MAX = 0xFF 2. BOTTOM = 0x00 13.8.2 Timer/Counter Control Register B – TCCR0B • Bit 7 – FOC0A: Force Output Compare A The FOC0A bit is only active when the WGM bits specify a non-PWM mode. However, for ensuring compatibility with future devices, this bit must be set to zero when TCCR0B is written when operating in PWM mode. When writing a logical one to the FOC0A bit, an immediate Compare Match is forced on the Waveform Generation unit. The OC0A output is changed according to its COM0A1:0 bits setting. Note that the FOC0A bit is implemented as a strobe. Therefore it is the value present in the COM0A1:0 bits that determines the effect of the forced compare. Table 13-7. Waveform Generation Mode Bit Description Mode WGM2 WGM1 WGM0 Timer/Counter Mode of Operation TOP Update of OCRx at TOV Flag Set on (1)(2) 0 0 0 0 Normal 0xFF Immediate MAX 10 0 1 PWM, Phase Correct 0xFF TOP BOTTOM 2 0 1 0 CTC OCRA Immediate MAX 30 1 1 Fast PWM 0xFF TOP MAX 41 0 0 Reserved – – – 51 0 1 PWM, Phase Correct OCRA TOP BOTTOM 61 1 0 Reserved – – – 7 1 1 1 Fast PWM OCRA TOP TOP Bit 7 6 5 4 3 210 FOC0A FOC0B – – WGM02 CS02 CS01 CS00 TCCR0B Read/Write W W R R R/W R/W R/W R/W Initial Value 0 0 0 0 0 0 0 0 |
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