VR4102 datasheet(404/701 Pages) NEC

404 / 701 page

CHAPTER 19 PIU (TOUCH PANEL INTERFACE UNIT)

404

19.6 TIMING

19.6.1 Touch/Release Detection Timing

Touch/release detection does not use the A/D converter but instead uses the voltage level of the TPY1 pin to

determine the panel’s touch/release state. The following figure shows a touch/release detection timing diagram.

Figure 19-6. Touch/Release Detection Timing

State

TPY,TPX

(PADSCANTYPE = 0)

(TPY1)

(Touch)

WaitPenTouch

Touch detected

(Release)

Standby

LowPower

DataScan

X-, X+, Y-, Y+

Interval

Release detected

(Touch)

(Release)

TPY,TPX

(PADSCANTYPE = 1)

Touch detected

LowPower

Z, X-, X+, Y-, Y+

Release detected

19.6.2 A/D Port Scan Timing

The A/D port scan function sequentially scans the A/D converter’s four input channel port pins and stores the data

in the data buffer used for A/D port scanning.

The following figure shows an A/D port scan timing diagram.

Figure 19-7. A/D Port Scan Timing

XXX state: Standby, WaitPenTouch, or Interval

State

AUDIOIN, ADIN[2:0]

ADPSSTART bit

(PIUASCNREG)

ADPortScan

AUDIOIN, ADIN2, ADIN1, ADIN0

XXX

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