Timing; Touch/Release Detection Timing; A/D Port Scan Timing - NEC VR4181 mPD30181 User Manual

14.6 Timing

14.6.1 Touch/release detection timing

Touch/release detection is not determined via the A/D converter but the voltage level of the TPY1 pin. The
following figure shows a timing of touch/release detection and coordinate detection.
State
TPY(1:0), TPX(1:0)
(PADSCANTYPE = 0)
TPY(1:0), TPX(1:0)
(PADSCANTYPE = 1)
Note Determined according to the status of the TPY1 signal as follows.
High level ... touched
Low level ... released

14.6.2 A/D port scan timing

During an A/D port scan, the four ports of A/D converter's input channel are sequentially scanned and the scanned
data are stored in the data buffers dedicated to A/D port scanning.
The following figure shows an A/D port scan timing diagram.
State
AUDIOIN,
ADIN(2:0)
ADPSSTART bit
(PIUASCNREG)
Remark XXX: Standby, WaitPenTouch, or Interval
298
CHAPTER 14 TOUCH PANEL INTERFACE UNIT (PIU)
Figure 14-6. Touch/Release Detection Timing
Standby WaitPenTouch
Touch detected
Touch detected
Figure 14-7. A/D Port Scan Timing
XXX
ADIN0 ADIN1
User's Manual U14272EJ3V0UM
DataScan
X − Y −
Note
X+
X − Y −
Note
Z X+
ADPScan
ADIN2 AUDIOIN
Interval
Note
Y+ Release detected
Note
Y+ Release detected
XXX