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SH79F166AP/044PR Datasheet(PDF) 75 Page - SINOWEALTH Electronic Ltd |
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SH79F166AP/044PR Datasheet(HTML) 75 Page - SINOWEALTH Electronic Ltd |
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75 / 113 page  SH79F166A 75 8.3.6 Dead Time The SH79F166 provides dead time control function on-chip. When PWM0S = 0, the dead time is generated as below. dead time dead time PWM0 PWM01 PWM0S=0 duty cycle dead time period Reload PWM Enable PWM int Reload PWM int When PWM0S = 1, the dead time is generated as below. dead time dead time PWM0 PWM01 PWM0S=1 duty cycle dead time period Reload PWM Enable PWM int Reload PWM int By writing PWM01 dead time control registers, a dead time can be generated between PWM0 and PWM01. PWM01 have the same period as PWM0. Note: (1) Dead time0 must be set before PWM outputs enabled. Otherwise, dead time will not change. So in order to change dead time, please disable PWM outputs first (while PWMLO is #55h), then change the dead time, enable PWM. 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 (PWM0 Period - PWM0 Duty) > 2* PWM01 dead time control. Otherwise the output of PWM01 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 step value is refer to TnCK0[1:0]. 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 to 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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