Figure 487. Fcnt Resolution Vs Frequency; Figure 488. Pwm Dithering Pattern - ST STM32G4 Series Reference Manual

Basic timers (TIM6/TIM7)
The minimum frequency is given by the following formula:
Note: The maximum TIMx_ARR value is limited to 0xFFFEF in dithering mode (corresponds to
65534 for the integer part and 15 for the dithered part).
As shown on the
resolution whatever the PWM frequency.
The period changes are spread over 16 consecutive periods, as described in the
below.
Counter period
ARR value
Auto-Reload
41
value
1410/2083
Resolution
Dithering mode disabled: F
Dithering mode enabled: F
Figure 487 below, the dithering mode allows to increase the PWM
Figure 487. F
Resolution
20-bit
16-bit
Dithering
No Dithering
F
Cnt
min

Figure 488. PWM dithering pattern

1 2 3 4 5
40 40 40 41
F
Tim
----------- -
⇒
= F =
CntMin
F
Cnt
pwmMin
pwmMin
resolution vs frequency
Cnt
6 7 8 9 10
643
40 40 40 41 40
RM0440 Rev 1
F
Tim
------------------------------------ -
Max
Resolution
F
Tim
--------------- -
=
65536
F
Tim
----------------------------- -
=
15
----- -
65535 +
16
F
Cnt
11 12 13 14
40 40 40 40
RM0440
MSv50910V1
Figure 488
15 16
40
40
MSv47465V1