M30222 Datasheet, PDF (102/237 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

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MITSUBISHI MICROCOMPUTERS
Specifications in this manual are tentative and subject to change
M30222 Group
Rev. G
Timer Functions for Three-phase Motor Control
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
A carrier wave of sawtooth waveform
Carrier wave
Signal wave
Timer B2
Trigger signal for
Timer Ai start
(Timer B2 overflow
signal)
Timer A4 output
m
U phase output
signal
U phase
output signal
U phase
U phase
Interrupt occurres.
Rewriting the value 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.
The three-phase
n
o
p
shift register
shifts in
synchronization
with the falling
edge of Timer A4.
Dead time
Note: Set to sawtooth modulation mode and to three-phase mode 0.
Fig. 1.76. Timing chart of operation (3)
1-103