SH7211_09 Datasheet, PDF (8/26 Pages) Renesas Technology Corp – MTU2 Three-Phase Complementary PWM Output Function

SH7211 Group
MTU2 Three-Phase Complementary
PWM Output Function (Complementary PWM Mode)
2.2 Operation of the Sample Program
2.2.1 Settings for Operation of the Sample Program
In this application note, channels 3 and 4 of the multi-function timer pulse unit 2 (MTU2) are set to complementary
PWM mode 3 and three-phase complementary PWM waveforms are output. In addition, toggle output synchronized
with the PWM carrier cycle is generated. Table 2 lists the setting conditions for complementary PWM mode operation.
Figure 4 shows a sample of output waveforms in complementary PWM mode.
Table 2 Setting for Operation in Complementary PWM Mode
Item
Channels in use
Operating mode
Functions of pins
Active level
Counter clock
PWM carrier cycle
Dead time
PWM duty
Interrupt
Description
Channels 3 and 4
Complementary PWM mode 4 (data transfer at counter peaks and troughs)
• TIOC3A pin: Toggle output synchronized to PWM cycle
• TIOC3B pin: PWM output 1 (positive phase waveform)
• TIOC3D pin: PWM output 1' (PWM output 1 antiphase waveform)
• TIOC4A pin: PWM output 2 (positive phase waveform)
• TIOC4C pin: PWM output 2' (PWM output 2 antiphase waveform)
• TIOC4B pin: PWM output 3 (positive phase waveform)
• TIOC4D pin: PWM output 4' (PWM output 3 antiphase waveform)
• Positive phase output: Low-active output
• Antiphase output: Low-active output
10 MHz (4 cycles of Pφ clock)
400 μm (carrier frequency: 2.5 kHz)
4 μm
• For PWM outputs 1, 2, and 3, the initial PWM duty is 50%.
• The PWM duty is updated by an interrupt generated at every compare
match with TGRA_3. (The setting value is incremented or
decremented.)
• TGRA_3 compare match interrupt
A compare match with TGRA_3 occurs every PWM carrier cycle.
REJ06B0891-0100/Rev.1.00
July 2009
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