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12.4.9
Complementary PWM Mode
In the complementary PWM mode, three-phase output of non-overlapping positive and negative
PWM waveforms can be obtained using channels 3 and 4.
In complementary PWM mode, TIOC3B, TIOC3D, TIOC4A, TIOC4B, TIOC4C, and TIOC4D
pins become PWM output pins, the TIOC3A pin can be set for toggle output synchronized with
the PWM period. TCNT3 and TCNT4 function as increment/decrement counters.
Table 12.15 shows the PWM output pins used. Table 12.16 shows the settings of the registers.
A function to directly cut off the PWM output by using an external signal is supported as a port
function.
Table 12.15 Output Pins for Complementary PWM Mode
Channel
Output Pin
Description
3
TIOC3A
Toggle output synchronized with PWM period (or I/O port)
TIOC3B
PWM output 1
TIOC3C
I/O port (Avoid setting this pin as a timer I/O pin in the
complementary PWM mode.)
TIOC3D
PWM output 1
(non-overlapping negative-phase waveform of
PWM output 1)
4
TIOC4A
PWM output 2
TIOC4B
PWM output 3
TIOC4C
PWM output 2
(non-overlapping negative-phase waveform of
PWM output 2)
TIOC4D
PWM output 3
(non-overlapping negative-phase waveform of
PWM output 3)
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