7906 datasheet(217/531 Pages) RENESAS

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THREE-PHASE WAVEFORM MODE

7906 Group User’s Manual Rev.2.0

10-12

10.2 Block description

10.2.5 Position-data-retain function control register

Figure 10.2.8 shows the structure of the position-data-retain function control register.

For details of the position-data-retain function, refer to section “10.6 Position-data-retain function.”

Fig. 10.2.8 Structure of position-data-retain function control register

(1) W-phase position data retain bit (bit 0)

This bit is used to retain the input level at pin IDW.

(2) V-phase position data retain bit (bit 1)

This bit is used to retain the input level at pin IDV.

(3) U-phase position data retain bit (bit 2)

This bit is used to retain the input level at pin IDU.

(4) Retain-trigger polarity select bit (bit 3)

This bit is used to select the trigger polarity to retain the position data.

When this bit = “0,” the falling edge of each positive phase is selected.

When this bit = “1,” the rising edge of each positive phase is selected.

Note: This register is valid only in the three-phase mode.

Bit name

Bit

7 to 4

Position-data-retain function control register (Address AA16)

Function

At reset

R/W

W-phase position data retain bit

V-phase position data retain bit

U-phase position data retain bit

Retain-trigger polarity select bit

Nothing is assigned.

b7 b6 b5 b4 b3 b2 b1 b0

Undefined

—

Input level at pin IDW is read out.

0 : “L” level

1 : “H” level

Input level at pin IDV is read out.

0 : “L” level

1 : “H” level

Input level at pin IDU is read out.

0 : “L” level

1 : “H” level

0 : Falling edge of positive phase

1 : Rising edge of positive phase

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