THREE-PHASE WAVEFORM MODE
10.2 Block description
10.2.9 Output polarity set toggle flip-flop
The output polarity set toggle flip-flops 0 through 2 are used to control the output polarity of the positive
and negative phases of the three-phase waveform.
In three-phase mode 0, values are set into the U-, V-, W-phase output polarity set buffer (bits 5 and 4 at
address A916 and bit 3 at address A816).
In three-phase mode 1, a value is set into the three-phase output polarity set buffer (bit 3 at address A616).
These bits are transferred to the output polarity set toggle flip-flop at an underflow of timer A3.
The contents of the output polarity set toggle flip-flop are reversed at the end of the timer A0/A1/A2 one-
shot pulse.
Table 10.2.2 lists the relationship between the contents of the output polarity set toggle flip-flop and the
output level, and Figure 10.2.13 shows the operations of the output polarity set buffer and output polarity
set toggle flip-flop.
Table 10.2.2 Relationship between contents of output polarity set toggle flip-flop and output level
Contents of output polarity set toggle flip-flop Output level of positive phase Output level of negative phase
0
1
H
L
L
H
Timer A3 underflow signal
Timer A2 one-shot pulse
Internal
signals
1
0
Contents of U-phase output
polarity set buffer
Trans-
ferred
Trans-
ferred
Trans-
ferred
Trans-
ferred
From buffer
Reversed
Reversed
Reversed
Reversed
1
0
Contents of output polarity
set toggle-flip flop 2
Fig. 10.2.13 Operations of output polarity set buffer and output polarity set toggle flip-flop
7906 Group User’s Manual Rev.2.0
10-15
RENESAS [ RENESAS TECHNOLOGY CORP ]
