7906 datasheet(220/531 Pages) RENESAS

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THREE-PHASE WAVEFORM MODE

7906 Group User’s Manual Rev.2.0

10-15

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

Fig. 10.2.13 Operations of output polarity set buffer and output polarity set toggle flip-flop

Contents of output polarity set toggle flip-flop

Output level of positive phase Output level of negative phase

Timer A3 underflow signal

Internal

signals

Timer A2 one-shot pulse

Contents of U-phase output

polarity set buffer

Contents of output polarity

set toggle-flip flop 2

Reversed

Trans-

ferred

From buffer

Trans-

ferred

Trans-

ferred

Trans-

ferred

7906 Datasheet(PDF) 220 Page - Renesas Technology Corp