THREE-PHASE WAVEFORM MODE
10.5 Three-phase waveform output fixation
➀
➀➀
➀
Carrier wave
Timer A3 interrupt request
Timer A3 underflow signal ➀2
➀1
➀1
➀1
➀1
➀1
➀1
➀1
➀1
Contents of timer A0/A1/A2
register
n
n
1
2
n
n
3
4
n
n
5
6
n
n
7
8
n
9
Contents of timer A01/A11/A21
n10
register
➀1
➀1
➀1
U/V/W-phase output fix bit
U/V/W-phase fixed output’s
polarity set bit
One-shot pulse output of
timer A0/A1/A2
1/f
➀ n
i
1/f
➀ n7
i
1/f
➀ n
i
1/f
➀ n5
i
➀2
1/fi
➀ n
3
1/f
➀ n
i
1/f
➀ n
i
1
4
6
2
Rever-
sed
Rever-
sed
Rever-
sed
Rever-
sed
Rever-
sed
Rever-
sed
Contents of three-phase
output polarity set buffer
Rever-
sed
Transferred
Transferred
Rever-
Rever-
Transferred
Rever-
sed
Trans-
ferred
Trans-
ferred
Trans-
ferred
Trans-
ferred
Rever-
sed
Contents of output polarity
set toggle flip-flop
Rever-
sed
Rever-
sed
Rever-
sed
sed
sed
➀2
➀2
Reversed signal of pulse
output of dead-time timer
Positive waveform output
Negative waveform output
➀1 : Written by software
➀2 : This is an internal signal, which cannot be read from the external.
fi : Count source of timer A0/A1/A2
This applies under the following conditions:
• Timer A3 interrupt request: every second time
• Timer A3 interrupt validity output: every even-numbered underflow in time A3
Fig. 10.5.1 Triangular wave modulation output example using U/V/W-phase output fix bit (three-phase mode 1)
7906 Group User’s Manual Rev.2.0
10-34
RENESAS [ RENESAS TECHNOLOGY CORP ]
