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TC35680FSG Datasheet(PDF) 58 Page - Toshiba Semiconductor |
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TC35680FSG Datasheet(HTML) 58 Page - Toshiba Semiconductor |
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58 / 91 page  TC35680FSG-002/TC35681FSG-002 58 2019-04-04 Rhythm Function (Output Masking) Figure 4-18 illustrates the outlines of the PWM rhythm function. TC35680/TC35681 integrate a rhythm counter whose clock source cycle is 50 ms (as example). The counter is independent of the pulse generation function. A 20-bit register (Pattern register) is also built in, and each bit of the register corresponds to the content of the rhythm counter which counts down every 50 ms. When a bit of the Pattern register is 0, the corresponding PWM output is masked and fixed to 0 or 1. This function can generate a 1-scond periodic waveform which is implemented to blink a LED or to sound a buzzer. PWM generation source clock Pattern regist er 1 0 1 PWM output waveform 50 ms Cycle time 1 0 1 1 0 1 0 1 19 18 17 16 15 1 0 19 Rhytm counter Pattern regist er PWM output waveform 50 ms 1s (50 ms × 20) Interrupt PWM generation source clock Figure 4-18 Output masking by PWM rhythm function Note: If the value of (Cycle time of the rhythm pattern setting (50 ms) ÷ Pulse cycle time) is not an integer, the PWM output pulse becomes narrow at the change timing of the Pattern register value. |
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