SN32F280 Series
32-Bit Cortex-M0 Micro-Controller
SONiX TECHNOLOGY CO., LTD
Page 118
Version 1.1
10.7 INVERSE PWM OUTPUT WITH DEAD-BAND PERIOD
The CT16B2_PWMm builds in inverse output function controlled by PWMmNIOEN[1:0] bits in
CT16Bn_PWMCTRL
register.
When PWMmNIOEN[1:0] = 00b, PWMmN pin is GPIO mode.
When PWMmNIOEN[1:0] = 01b, PWMmN pin changes to inverse PWM output pin which outputs the inverse PWM
signal of PWMm with dead-band period,
but same High signal during dead-band period.
When PWMmNIOEN[1:0] = 10b, PWMmN pin changes to inverse PWM output pin which outputs the inverse
PWMm signal with dead-band period,
but same Low signal during dead-band period.
When PWMmNIOEN[1:0] = 11b, PWMmN pin changes to non-inverse PWM output pin which outputs the same
PWMm signal with dead-band period.
The dead- band period is symmetrical at left-right terminal of PWM high pulse width, and the PWM dead-band period is
controlled by
CT16Bn_PWMmNDB
register. This register is only usable when PWMmNIOEN[1:0]
≠ 00b, and the PWM
dead-band function is disabled when the value of this register is 0.
If DB = 1, the dead-band period is set as 1*CT16Bn_PCLK*(PR+1), 1*CT16Bn_PCLK*(PR+1) dead-band is in the left
side of PWM high pulse, and the other side also includes one dead-band duration, so the total dead-band period is
2*CT16Bn_PCLK*(PR+1).
To take care the PWM high pulse width with dead-bane function is necessary. Recommend the dead-band period less
than PWM high pulse width, or the PWM high pulse width disappears.
The PWMmN waveform without dead-band:
PWM1
PWM1NIOEN=01b
PWM1NIOEN=10b
PWM1NIOEN=11b
Phase 1
Phase 2
Phase 3
Phase 4
The PWMmN waveform with dead-band:
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