m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 219

• Manufacturer Part Number: m37905
• Description: Mitsubishi 16-bit Single-chip Microcomputer 7700 Family / 7900 Series
• Manufacturer: Renesas Electronics Corporation.

forcibly-cutoff signal input pin
period
Output width
THREE-PHASE WAVEFORM MODE
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
Three-phase waveform output pins
Three-phase-waveform-output-
Operation modes
Timer to be used
Three-phase waveform
Output waveform and
Dead time (width)
Note: This value does not include the dead time.
Table 10.1.2 Comparison of operations in three-phase mode 0 and 1
10-2
10.1 Overview
Timer A3 interrupt request
occurrence interval
Timers A0 through A2
Output polarity
Item
6 pins (U, U, V, V, W, W)
P6OUT
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
Timers A0 through A2 (Used in the one-shot pulse mode)
Timer A3 (Used in the timer mode)
Saw-tooth-wave mo-
dulation output
Triangular wave mo-
dulation output
Fixed level output
Dead-time timer is used.
See Table 10.2.1.
Each timer A3 underflow
Each timer uses one register.
• By software, the output polarity can be set to the
• If necessary, the contents of each output
• Timer A0 : W- and W-phase waveform control
• Timer A1 : V- and V-phase waveform control
• Timer A2 : U- and U-phase waveform control
• Output period control
output polarity set buffer of the U, V, or W phases.
polarity set buffer are reversed by software.
f
1
1
CUT
to
Three-phase mode 0
(Input of falling edge)
7905 Group User’s Manual Rev.1.0
f
4096
1
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).
underflow or forth one.
1
f
f
65536
1
1
1
to
2 to
f
Specifications
4096
1
f
4096
1
Each second timer A3 underflow or forth
one is selected by software.
Each timer uses two registers alternately.
• By software, the output polarity can be set
• At each period, the contents of the three-
65535 (Note)
to the three-phase output polarity set buffer.
phase output polarity set buffer are reversed
by hardware.
65535
Three-phase mode 1
2 (Note)