M16C62_M Datasheet, PDF (122/615 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/60 SERIES

Timers’ functions for three-phase motor control
Mitsubishi microcomputers
M16C / 62A Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
phase waveform. In this way, a waveform can be picked up from the applicable terminal in a manner in
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which the "L" level of the U phase waveform doesn’t lap over that of the U phase waveform, which has the
opposite phase of the U phase waveform. The width of the “L” level too can be adjusted by varying the
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values of timer B2, timer A4, and timer A4-1. In dealing with the V and W phases, and V and W phases,
the latter are of opposite phase of the former, have the corresponding timers work similarly to dealing with
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the U and U phases to generate an intended waveform.
A carrier wave of triangular waveform
Carrier wave
Signal wave
Timer B2
Trigger signal for
timer Ai start
(timer B2 overflow
signal)
Timer B2 interrupt occurs
Rewriting timer A4 and timer A4-1.
Possible to set the number of overflows to generate an
interrupt by use of the interrupt occurrences frequency
set circuit
Timer A4 output ^m
n
m
n
m
p
o
Control signal for
timer A4 reload
U phase
output signal
U phase
output signal
U phase
U phase
Dead time
Note: Set to triangular wave modulation mode and to three-phase mode 1.
The three-phase
shift register
shifts in
synchronization
with the falling
edge of the timer
A4 output.
Figure 1.15.6. Timing chart of operation (1)
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