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7220 Datasheet(PDF) 94 Page - Renesas Technology Corp |
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7220 Datasheet(HTML) 94 Page - Renesas Technology Corp |
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94 / 303 page  2-67 7220 Group User’s Manual 2.10 PWM 2.10.3 8-bit PWM (PWM0 to PWM5: address 00D016 to 00D416 and 00F616 ) The 8-bit PWM outputs waveform which is the logical sum (OR) of pulses corresponding to bits 0 to 7 of the 8-bit PWM register. That is to say, 8 kinds of pulses corresponding to the weight of each bit of the 8-bit PWM register are output inside the circuit during 1 cycle. Among these pulses, OR of pulses that correspond to bits, which is set to “1,” in the 8-bit PWM register to external devices as PWM output. Figure 2.10.4 shows the pulse waveforms corresponding to the weight of each bit of the 8-bit PWM register. Figure 2.10.5 shows the example of 8-bit PWM output. As shown in the Figures, 256 kinds of output (HIGH duration: 0/256 to 255/256) are selected by changing the contents of the PWM register (a length of entirely HIGH cannot be output). FUNCTIONAL DESCRIPTION |
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