VR4102 datasheet(402/701 Pages) NEC

402 / 701 page

CHAPTER 19 PIU (TOUCH PANEL INTERFACE UNIT)

402

(3) Register setting flow for manual scan coordinate detection

Disable state

<1> PIUCNTREG

PIUPWR = 1

Standby state

<2> PIUCNTREG

PIUMODE[1:0] = 00

PADSCANSTART = 1

<3> PIUCNTREG

PIUSEQEN = 1

PenDataScan state

(4) Register setting flow during Suspend mode transition

Standby, WaitPenTouch, or Interval state

<1> PIUCNTREG

PIUSEQEN = 0

Standby state

<2> PIUCNTREG

PIUPWR = 1

Disable state

(5) Register setting flow when returning from Suspend mode transition

Disable state

<1> PIUCNTREG

PIUPWR = 1

Standby state

<2> PIUCNTREG

PIUMODE [1:0] = 00

PADATSCAN = 1

PADATSTOP = 1

<3> PIUCNTREG

PIUSEQEN = 1

WaitPenTouch state

Touch detected

PenDataScan state

(6) Register setting flow for command scan

Disable state

<1> PIUCNTREG

PIUPOWER = 1

Standby state

<2> PIUCNTREG

PIUMODE [1:0] = 01

<3> PIUCNTREG

Set touch panel pins, select input port

<4> PIUCNTREG

PIUSEQEN = 1

CMDScan state

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