M16C80 Datasheet, PDF (130/358 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/80 SERIES

M16C/80 Group
15. Three-phase motor control timers’ functions
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
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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)
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
(Note 1)
U phase
U phase
Dead time
(Note 2)
U phase
U phase
Dead time
INV13(Triangular wave
modulation detect flag)
(Note 3)
Note 1: When INV14="0" (output wave Low active)
Note 2: When INV14="1" (output wave High active)
Note 3: Set to triangular wave modulation mode and to three-phase mode 1.
Figure 15.6 Timing chart of operation (1)
Rev.1.00 Aug. 02, 2005 ^{Page 119} of 329
REJ09B0187-0100
The three-phase
shift register
shifts in
synchronization
with the falling
edge of the A4
output.