VR4102 datasheet(423/701 Pages) NEC

423 / 701 page

423

CHAPTER 21 KIU (KEYBOARD INTERFACE UNIT)

This chapter describes the KIU’s operations and register settings.

21.1 GENERAL

The KIU includes 12 scan lines and 8 detection lines. The number of key inputs to be detected can be selected

from 96/80/64, by switching the number of scan lines from 12/10/8.

The register can be set to enable the 12 scan lines to be used as a general-purpose output port.

21.2 REGISTER SET

The KIU registers are listed below.

Table 21-1. KIU Registers

Address

R/W

Function

0x0B00 0180

R/W

KIUDAT0

KIU Data0 Register

0x0B00 0182

R/W

KIUDAT1

KIU Data1 Register

0x0B00 0184

R/W

KIUDAT2

KIU Data2 Register

0x0B00 0186

R/W

KIUDAT3

KIU Data3 Register

0x0B00 0188

R/W

KIUDAT4

KIU Data4 Register

0x0B00 018A

R/W

KIUDAT5

KIU Data5 Register

0x0B00 0190

R/W

KIUSCANREP

KIU Scan/Repeat Register

0x0B00 0192

KIUSCANS

KIU Scan Status Register

0x0B00 0194

R/W

KIUWKS

KIU Wait Keyscan Stable Register

0x0B00 0196

R/W

KIUWKI

KIU Wait Keyscan Interval Register

0x0B00 0198

R/W

KIUINT

KIU Interrupt Register

0x0B00 019A

KIURST

KIU Reset Register

0x0B00 019C

R/W

KIUGPEN

KIU General Purpose Output Enable

0x0B00 019E

R/W

SCANLINE

KIU Scan Line Register

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