VR4102 datasheet(434/701 Pages) NEC

434 / 701 page

CHAPTER 21 KIU (KEYBOARD INTERFACE UNIT)

434

21.2.9 SCANLINE (0x0B00 019E)

Bit

D15

D14

D13

D12

D11

D10

Name

Reserved

R/W

RRR

RTCRST

Other resets

Bit

D6D5

D4D3D2

Name

Reserved

LINE[1]

LINE[0]

R/W

RRR

R/W

RTCRST

Other resets

Bit

Name

Function

D[15..2]

Reserved

Write 0 when writing. 0 is returned after a read.

D[1..0]

LINE[1..0]

SCAN pin use/do not use setting

11 :

Do not use SCAN pins for key scan

The KIU’s SCAN pins can be used as an output port.

10 :

Use eight key scan pins (KSCAN[7..0])

Key scan uses eight key scan pins (supports 64 keys)

The remaining four pins can be used as an output port.

01 :

Use ten key scan pins (KSCAN[9..0])

Key scan uses ten key scan pins (supports 80 keys)

The remaining two pins can be used as an output port.

00 :

Use twelve key scan pins (KSCAN[11..0])

Key scan uses twelve key scan pins (supports 96 keys)

No pins can be used as an output port.

This register is used to switch the number of scan lines.

VR4102 Datasheet(PDF) 434 Page - NEC

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