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Timers’ functions for three-phase motor control
109
Mitsubishi microcomputers
M16C / 62N Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Timer B2
Timer A4 output
U phase
Dead time
Carrier wave
Signal wave
A carrier wave of sawtooth waveform
m
n
o
p
Note: Set to sawtooth modulation mode and to three-phase mode 0.
Interrupt occurs.
Rewriting the value of timer A4.
U phase output
signal
U phase
output signal
The three-phase
shift register
shifts in
synchronization
with the falling
edge of timer A4.
Data transfer is made from the three-
phase buffer register to the three-
phase shift register in step with the
timing of the timer B overflow.
Trigger signal for
timer Ai start
(timer B2 overflow
signal)
Figure 1.16.8. Timing chart of operation (3)