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VR4102 Datasheet(PDF) 406 Page - NEC

Part # VR4102
Description  64/32-bit Microprocessor
PDF  701 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

VR4102 Datasheet(HTML) 406 Page - NEC

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CHAPTER 19 PIU (TOUCH PANEL INTERFACE UNIT)
406
Response
In condition 3, valid data contained in the pages when the PIUDataLostIntr interrupt occurs is never
overwritten.
After two pages of valid data are processed, clear the causes of the three interrupts (PIUDataLostIntr,
PIUPAGE1INTR, and PIUPAGE0INTR).
After clearing these interrupt causes, set the PADATSTART bit or PADSCANSTART bit of PIUCNTREG
to restart the coordinate detection operation.
(4) When the next data transfer starts while there is valid data in the ADPortScan buffer
Cause
This condition is caused when valid data is not processed even while the ADPortScan buffer holds valid
data (PADADPINTR interrupt occurrence).
Response
In condition 4, valid data contained in the buffer when the PIUDataLostIntr interrupt occurs is never
overwritten.
After valid data in the buffer is processed, clear the causes of the two interrupts (PIUDataLostIntr,
PADADPINTR).
After clearing these interrupt causes, set the ADPSSTART bit of PIUASCNREG to restart the general-
purpose A/D port scan.



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