7906 datasheet(446/531 Pages) RENESAS

446 / 531 page

7906 Group User’s Manual Rev.2.0

20-41

APPENDIX

Appendix 2. Control registers

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

Reference

10-12

Serial I/O pin control register (Address AC16)

b7 b6 b5 b4 b3 b2 b1 b0

7 to 4

CTS0/RTS0 separate select bit

(Note)

CTS1/RTS1 separate select bit

(Note)

TxD0/P13 switch bit

TxD1/P17 switch bit

The value is “0000” at reading.

0 : CTS0/RTS0 are used together.

1 : CTS0/RTS0 are separated.

0 : Functions as TxD1.

1 : Functions as P17.

—

Bit name

Bit

Function

At reset

R/W

0 : CTS1/RTS1 are used together.

1 : CTS1/RTS1 are separated.

0 : Functions as TxD0.

1 : Functions as P13.

Reference

11-17

Note: Valid when the CTS/RTS enable bit (bit 4 at addresses 3416 and 3C16) is “0.”

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