M16C Datasheet, PDF (107/262 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
Assigning certain values to DU0 (bit0) of three-phase output buffer register 0 (01CA16) and DUB0 (bit1) of the
same register, and to DU1 (bit0) of three-phase output buffer register 1 (01CB16) and DUB1 (bit1) of the same
register allows you to output the waveforms as shown in the Figure 11-7, that is, to output the U phase alone,
to fix U phase to "H", to fix the U phase to "H", or to output the U phase alone.
A carrier wave of triangular waveform
Carrier wave
Signal wave
Timer B2
Rewriting timer A4 every timer B2 interrupt occurres.
Trigger signal for
timer Ai start
(timer B2 overflow
signal)
Timer A4 output ^m
Timer B2 interrupt occurres.
Rewriting three-phase buffer register.
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.
Figure 11-7. Timing chart of operation (2)
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