VR4102 datasheet(401/701 Pages) NEC

401 / 701 page

CHAPTER 19 PIU (TOUCH PANEL INTERFACE UNIT)

401

19.4 REGISTER SETTING FLOW

Be sure to reset the PIU before operating the scan sequencer. Setting initial values via a reset sets particular

values for the sequence interval, etc., that are required.

The registers for which these initial settings are necessary are listed below.

PIUSITVLREG

ScanIntval [10:0]

PIUSTBLREG

Stable [3:0]

Interrupt mask cancellation settings are required for registers other than the PIU registers.

Setting

Unit

Bit

Value

ICU

MSYSINTREG

PIUINTR

Interrupt mask clear

ICU

MPIUINTREG

bit 6:0

0x7F

Clock mask clear

CMU

CMUCLKMSK

MSKPIU

(1) Register setting flow for voltage detection at A/D general-purpose ports and audio input port

Standby, WaitPenTouch, or Interval state

<1> PIUAMSKREG

AD port and audio input port mask setting

<2> PIUASCNREG

ADPSSTART = 1

ADPortScan state

<3> PIUASCNREG

ADPSSTART = 0

Standby, WaitPenTouch, or Interval state

(2) Register setting flow for auto scan coordinate detection

Standby state

<1> PIUCNTREG

PIUMode [1:0] = 00

PADATSCAN = 1

PADATSTOP = 1

<2> PIUCNTREG

PIUSEQEN = 1

WaitPenTouch state

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