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AT90SCR100 Datasheet(PDF) 148 Page - ATMEL Corporation |
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AT90SCR100 Datasheet(HTML) 148 Page - ATMEL Corporation |
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148 / 433 page  148 TPR0327AY–SMS–30Jan09 AT90SCR100 Combined with the WGM22 bit found in the TCCR2B 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 13-23. 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 139). Note: 1. MAX= 0xFF, BOTTOM= 0x00 13.3.8.2 TCCR2B – Timer/Counter Control Register B • Bit 7 – FOC2A: Force Output Compare A The FOC2A 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 TCCR2B is written when operating in PWM mode. When writing a logical one to the FOC2A bit, an immediate Compare Match is forced on the Waveform Generation unit. The OC2A output is changed according to its COM2A1:0 bits setting. Note that the FOC2A bit is implemented as a strobe. Therefore it is the value present in the COM2A1:0 bits that determines the effect of the forced compare. A FOC2A strobe will not generate any interrupt, nor will it clear the timer in CTC mode using OCR2A as TOP. The FOC2A bit is always read as zero. • Bit 6 – FOC2B: Force Output Compare B The FOC2B bit is only active when the WGM bits specify a non-PWM mode. Table 13-23. Waveform Generation Mode Bit Description Mode WGM22 WGM21 WGM20 Timer/Counter Mode of Operation TOP Update of OCRx at TOV Flag Set on(1) 0 0 0 0 Normal 0xFF Immediate MAX 1 001 PWM, Phase Correct 0xFF TOP BOTTOM 2 0 1 0 CTC OCR2A Immediate MAX 3 0 1 1 Fast PWM 0xFF BOTTOM MAX 4 100 Reserved – – – 5 101 PWM, Phase Correct OCR2A TOP BOTTOM 6 110 Reserved – – – 7 111 Fast PWM OCR2A BOTTOM TOP Bit 7 6 5 4 3 2 1 0 $0000B1 FOC2A FOC2B - - WGM22 CS22 CS21 CS20 TCCR2B Read/write W W R R R/W R/W R/W R/W Initial value 0 0 0 0 0 0 0 0 0x00 |
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