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General-purpose timers (TIM15/TIM16/TIM17) RM0440

1374/2126 RM0440 Rev 4

Dead-time insertion is enabled by setting both CCxE and CCxNE bits, and the MOE bit if the

break circuit is present. There is one 10-bit dead-time generator for each channel. From a

reference waveform tim_ocxref, it generates 2 outputs tim_ocx and tim_ocxn. If tim_ocx and

tim_ocxn are active high:

• The tim_ocx output signal is the same as the reference signal except for the rising

edge, which is delayed relative to the reference rising edge.

• The tim_ocxn output signal is the opposite of the reference signal except for the rising

edge, which is delayed relative to the reference falling edge.

If the delay is greater than the width of the active output (tim_ocx or tim_ocxn) then the

corresponding pulse is not generated.

The following figures show the relationships between the output signals of the dead-time

generator and the reference signal tim_ocxref. (we suppose CCxP=0, CCxNP=0, MOE=1,

CCxE=1 and CCxNE=1 in these examples)

Figure 465. Complementary output with symmetrical dead-time insertion.

The DTAE bit in the TIMx_DTR2 allows to differentiate the deadtime values for rising and

falling edges of the reference signal, as shown on Figure 466.

In asymmetrical mode (DTAE = 1), the rising edge-referred deadtime is defined by the

DTG[7:0] bitfield in the TIMx_BDTR register, while the falling edge-referred is defined by the

DTGF[7:0] bitfield in the TIMx_DTR2 register. The DTAE bit must be written before enabling

the counter and must be not modified while CEN = 1.

It is possible to have the deadtime value updated on-the-fly during pwm operation, using a

preload mechanism. The deadtime bitfield DTG[7:0] and DTGF[7:0] are preloaded when the

DTPE bit is set, in the TIMX_DTR2 register. The preload value is loaded in the active

Note: If the DTPE bit is enabled while the counter is enabled, any new value written since last

update will be discarded and previous value will be used.

MSv62332V1

delay

tim_ocxref

tim_ocx

tim_ocxn

ST STM32G431 User Manual

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