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R0P7727TH003TRKE General Information Manual
[Calibration Method]
(１) The SH7727 writes the dot points of points A and B to the registers XAPDR, YAPDR, XBPDR, and
YBPDR.
(２) When point A is pen-touched, it is signaled by a pen touch interrupt. The A/D conversion result of the
pen-touched point A is written to the registers XAPAR and YAPAR.
(３) Next, when point B is pen-touched, it is signaled by a pen touch interrupt. The A/D conversion result of
the pen-touched point B is written to the registers XBPAR and YBPAR.
(４) Calibration takes place according to data in the above steps (1) to (3). Using the following expression,
the SH7727 calculates the number of dots per data of the X position A/D conversion result and that of the
Y position A/D conversion result.
Number of dots per data of the X position A/D conversion result (DX)
DX = (DXA – DXB) / (TXB – TXA)
Number of dots per data of the Y position A/D conversion result (DY)
DY = (DYA – DYB) / (TYB- TYA)
（ 5 ）
The above calculation results are multiplied by 1,000, their decimal places are rounded, and the
resulting integers are written to the registers DXDR and DYDR.
DX dot register (DXDR) = DX x 1,000 (rounding the decimal places)
DY dot register (DYDR) = DY x 1,000 (rounding the decimal places)
（ 6 ）
The power supply controller uses data stored in the registers DXDR, DYDR, XAPDR, YAPDR,
XAPAR, and YAPAR to calculate dot position data (XPDR, YPDR) of the pen-touched point on
the LCD. The power supply controller uses the following expression to calculate dot position
data.
X position dot register (XPDR)
XPDR = (DXA – (DX x (TXD – TXA)) / 1,000
Y position dot register (YPDR)
YPDR = (DYA – (DY x (TYD – TYA)) / 1,000
The power supply controller outputs data stored in the X position A/D register (XPAR) and Y position A/D
register (YPAR). When the values stored in the DX dot register (DXDR) and DY dot register (DYDR) are
not 0, the power supply controller outputs the data derived from the above expressions to the X position
dot register (XPDR) and Y position dot register (YPDR). When either value is 0, it does not use the
above expression for calculation and outputs only XPAR and YPAR data.
DXA: X position drawing dot point of point A (XAPDR)
DXB: X position drawing dot point of point B (XBPDR)
TXA: X position A/D conversion result of point A (XAPAR)
TXB: X position A/D conversion result of point B (XBPAR)
DYA: Y position drawing dot point of point A (YAPDR)
DYB: Y position drawing dot point of point B (YBPDR)
TXA: Y position A/D conversion result of point A (YAPAR)
TXB: Y position A/D conversion result of point B (YBPAR)
DXA: XA position dot register (XAPDR) data
DX: DX1 dot register (DXDR) data
TXA: XA position A/D register (XAPAR) data
TXD: X position A/D register (XPAR) data
DYA: YA position dot register (YAPDR) data
DY: DY dot register (DYDR) data
TYA: YA position A/D register (YAPAR) data
TYD: X position A/D register (YPAR) data
Where TXA < TXB, DXA > DXB
Where TYA < TYB, DYA > DYB
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Power Supply Controller
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