M16C80 Datasheet, PDF (134/358 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
___
Setting “1” both in DUB0 and in DUB1 provides a means to output the U phase alone and to fix the U
phase output to “H” as shown in Figure 15.9.
A carrier wave of sawtooth waveform
Carrier wave
Signal wave
Timer B2
Trigger signal for
timer Ai start
(timer B2 overflow
signal)
Interrupt occurres.
Rewriting the value of timer A4.
Interrupt occurres.
Rewriting the value of timer A4.
Rewriting three-phase
output buffer register
Data transfer is made from the three-
phase buffer register to the three-
phase shift register in step with the
timing of the timer B overflow.
Timer A4 output
m
n
U phase
output signal
U phase
output signal
U phase
The three-phase
shift register shifts
p
in synchronization
with the falling
edge of timer A4.
U phase
Dead time
Note: Set to sawtooth modulation mode and to three-phase mode 0.
Figure 15.9 Timing chart of operation (4)
Rev.1.00 Aug. 02, 2005 ^{Page 123} of 329
REJ09B0187-0100