M16C80 Datasheet, PDF (131/358 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
Assigning certain values to DU0 (bit 0 at 030A16) and DUB0 (bit 1 at 030A16), and to DU1 (bit 0 at 030B16)
and DUB1 (bit 1 at 030B16) allows you to output the waveforms as shown in Figure 15.7, 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 15.7 Timing chart of operation (2)
Rev.1.00 Aug. 02, 2005 ^{Page 120} of 329
REJ09B0187-0100