ST92141 STMicroelectronics, ST92141 Datasheet - Page 119

• Manufacturer Part Number: ST92141
• Description: 8/16-bit Mcu For 3-phase Ac Motor Control
• Manufacturer: STMicroelectronics

INDUCTION MOTOR CONTROLLER (Cont’d)
PWM signals generation in Classical mode
In this mode, each of the three PWM signals set to
‘0’ when the PWM Counter reaches, in up-count-
ing, the corresponding 11-bit Compare register
value and they are set to ‘1’ when the PWM Coun-
ter is cleared.
If the 11-bit Compare register value is greater than
the extended Compare 0 register (the 11
Figure 66. Classical PWM Waveforms (Compare 0 Register = 8)
1
2
3
4
‘1’
‘0’
1 Compare Register value = 4
2 Compare Register value = 8
3 Compare Register value > 8
4 Compare Register value = 0
0
1
ST92141 - 3-PHASE INDUCTION MOTOR CONTROLLER (IMC)
2
3
th
bit is
4
set to ‘0’), the corresponding PWM output signal is
held at ‘1’.
If the 11-bit Compare register value = 0, the corre-
sponding PWM output signal is held at ‘0’.
Figure 66
an example where the Compare 0 register value =
8.
5
6
shows some Classical PWM waves in
7
8
0
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1
9