SH7211_09 Datasheet, PDF (2/26 Pages) Renesas Technology Corp – MTU2 Three-Phase Complementary PWM Output Function

SH7211 Group
MTU2 Three-Phase Complementary
PWM Output Function (Complementary PWM Mode)
1. Preface
1.1 Specifications
This application note describes how to use the complementary PWM mode function of multi-function timer pulse unit 2
(MTU2) to output three-phase complementary PWM waveforms. Figure 1 shows the configuration.
• Channels 3 and 4 of MTU2 are set to complementary PWM mode (complementary PWM mode 3).
• The PWM positive phase output pins are TIOC3B, TIOC4A, and TIOC4B. The antiphase output pins
corresponding to these phase output pins are TIOC3D, TIOC4C, and TIOC4D.
• The PWM output signal is low-active.
• In complementary PWM mode, PWM waveform output incorporates dead time (anti-short periods) to prevent
overlap between the positive and antiphases. The dead time is set to 4 µm.
• The PWM carrier cycle is set to 400 µm.
• The PWM duty setting values are updated at an interrupt generated every PWM carrier cycle.
• A toggle waveform synchronized with the PWM carrier half-cycle is output by pin TIOC3A.
SH7211
SH-2A
Interrupt request
PWM cycle setting
PWM duty setting (×3)
Dead time setting
MTU2
Channels 3 and 4
Complementary
PWM mode 3
TIOC3A (PB17)
TIOC3B (PB18)
TIOC3D (PB19)
TIOC4A (PB4)
TIOC4C (PB6)
TIOC4B (PB5)
TIOC4D (PB7)
Toggle output (synchronized with PWM cycle)
PWM output pin 1 (positive phase)
PWM output pin 1' (antiphase)
PWM output pin 2 (positive phase)
PWM output pin 2' (antiphase)
PWM output pin 3 (positive phase)
PWM output pin 3' (antiphase)
Figure 1 Three-Phase Complementary PWM Output (Complementary PWM Mode 3)
1.2 Module Used
Channels 3 and 4 of multi-function timer pulse unit 2 (MTU2)
REJ06B0891-0100/Rev.1.00
July 2009
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