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SH79F3283P/032PR Datasheet(PDF) 86 Page - SINOWEALTH Electronic Ltd |
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SH79F3283P/032PR Datasheet(HTML) 86 Page - SINOWEALTH Electronic Ltd |
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86 / 144 page  SH79F3283 86 8.3.6 Dead time SH79F3283 provides dead time function on-chip. When PWM0S = 0, the dead time is generated as below. dead time dead time PWM0x PWM01x PWM0S=0 duty cycle dead time period Reload PWM Enable PWM int Reload PWM int x=A,B,C x=A,B,C When PWM0S = 1, the dead time is generated as below. dead time dead time PWM0x PWM01x PWM0S=1 duty cycle dead time period Reload PWM Enable PWM int Reload PWM int x=A,B,C x=A,B,C By writing PWM0 dead time control register, a dead time can be generated between PWM0x (x = A, B, C) and PWM01x (x = A, B, C). PWM01x (x = A, B, C) has the same period as PWM0x (x = A, B, C) Note: (1) The dead time must be set before PWM output enable. Otherwise, dead time will not change. So in order to change dead time, please disable PWM output first (While PWMLO is #55H), then change the dead time, enable PWM output. Finally, change the data in PWMLO not equal to #55H in order to make sure the PWM registers would not be changed by noise. (2) In order to generate dead time, please make sure that (PWM0x Period-PWM0x Duty) > 2 X PWM01x dead time control. Otherwise the output of PWM01x is high level when PWMS = 1 or GND when PWMS = 0. (3) PWMDT is to used to control Dead Time, the step value is fixed oscillator clock time, but period and duty value is refer to TnCK2-0. 2 oscillator clocks at least. (4) If dead time is needed, any time when PWM is disabled, before enable PWM again, dead time register must be clear to 0 at first, and then set the proper value. Table 8.20 PWM0 Dead Time Control Register D1H Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 PWM0DT DT0.7 DT0.6 DT0.5 DT0.4 DT0.3 DT0.2 DT0.1 DT0.0 R/W R/W R/W R/W R/W R/W R/W R/W R/W Reset Value (POR/WDT/LVR/PIN) 0 0 0 0 0 0 0 0 Bit Number Bit Mnemonic Description 7-0 DT0[7:0] 12 bit PWM0 dead time control The dead time period = (DT0.7 - DT0.0) X tOSC |
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