M16C Datasheet, PDF (106/262 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Preliminary Specifications REV.B
Specifications in this manual are tentative and subject to change.
Mitsubishi microcomputers
M16C / 6N Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Timers’ functions for three-phase motor control
is generated by these workings repeatedly. With the exception that the three-phase output shift register on
the U phase side is used, the workings in generating a U phase waveform, which has the opposite phase of
the U phase waveform, are the same as in generating a U phase waveform . In this way, a waveform can be
picked up from the applicable terminal in a manner in 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 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 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)
Timber B2 interrupt occurres
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
Trigger signal: set to triangular wave modulation mode and to three-phase mode 1
Figure 11-6. Timing chart of operation (1)
106
The three-phase
shift register
shifts in
synchronization
with the falling
edge of the A4
output.