M30222 Datasheet, PDF (100/237 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

deUvnedloepr ^ment
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
Assigning certain values to DU0 (bit 0 at 034A16) and DUB0 (bit 1 at 034A16), and to DU1 (bit 0 at
034B16) and DUB1 (bit 1 at 034B16) allows the user to output the waveforms as shown in Figure 1.75,
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
Tmer 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 0.
Fig. 1.75. Timing chart of operation (2)
1-101