THREE-PHASE WAVEFORM MODE
10.1 Overview
10.1 Overview
The three-phase waveform mode serves as follows: three-phase waveforms (3 positive waveforms and 3
negative waveforms) are output from the three-phase waveform output pins. The three-phase waveform
mode consists of “three-phase mode 0” and “three-phase mode 1.”
Table 10.1.1 lists the specifications of the three-phase waveform mode, Table 10.1.2 lists the comparison
of operations in three-phase mode 0 and 1, and Figure 10.1.1 shows the comparison of waveforms in three-
phase mode 0 and 1.
Table 10.1.1 Specifications of three-phase waveform mode
Item
Specifications
Three-phase waveform output pins
Three-phase-waveform-output-
forcibly-cutoff signal input pin
Operation modes
6 pins (U, U, V, V, W, W)
P6OUTCUT (Input of falling edge)
Three-phase mode 0 A timer A3 interrupt request occurs at each timer A3 underflow.
Three-phase mode 1 A timer A3 interrupt request occurs at each second timer A3
underflow or forth one.
Timer to be used
Timers A0 through A2 (Used in the one-shot pulse mode)
• Timer A0 : W- and W-phase waveform control
• Timer A1 : V- and V-phase waveform control
• Timer A2 : U- and U-phase waveform control
Timer A3 (Used in the timer mode)
• Output period control
Three-phase waveform
period
1
f4096
1
f1
to
✕ 65536
Output waveform and
Output width
Saw-tooth-wave mo-
dulation output
1
f1
1
f4096
to
✕ 65535 (Note)
Triangular wave mo-
1
f4096
1
f1
✕ 2 to
✕ 65535 ✕ 2 (Note)
dulation output
Each of the U, V, W phases is fixed to an arbitrary level.
Each of the U, V, W phases is fixed to the reversed level of the
corresponding positive phase (the U, V, W phases).
Fixed level output
Dead time (width)
Dead-time timer is used.
See Table 10.2.1.
Note: This value does not include the dead time.
Table 10.1.2 Comparison of operations in three-phase mode 0 and 1
Three-phase mode 0
Three-phase mode 1
Timer A3 interrupt request Each timer A3 underflow
occurrence interval
Each second timer A3 underflow or forth
one is selected by software.
Timers A0 through A2 Each timer uses one register.
Each timer uses two registers alternately.
Output polarity
•
By software, the output polarity can be set to the • By software, the output polarity can be set
output polarity set buffer of the U, V, or W phases. to the three-phase output polarity set buffer.
• If necessary, the contents of each output • At each period, the contents of the three-
polarity set buffer are reversed by software. phase output polarity set buffer are reversed
by hardware.
7906 Group User’s Manual Rev.2.0
10-2
RENESAS [ RENESAS TECHNOLOGY CORP ]
