ra8803 RAIO Technology Inc., ra8803 Datasheet - Page 31

• Manufacturer Part Number: ra8803
• Description: Two Layers Character/graphic Lcd Controller Specification
• Manufacturer: RAIO Technology Inc.

Version 2.5
RAiO
6-10 Key Scan
6-11 Interrupt and Busy
TECHNOLOGY INC.
RA8803/8822 features with Key Scan circuit, and could be used as Keyboard function. It will help to
integrated the system circuit that includes keyboard application. The related Registers are KSCR, KSDR,
and KSER.
RA8803/8822 provides an Interrupt signal (INT) to indicate four possible interrupts:
These four interrupts can be enabled or disabled respectively. The register [A0h] INTR controls the
setup of interrupt mask and record the status.
If Cursor Position X Register (CPXR) = INTX, a interrupt has occurred
If Cursor Position Y Register (CPYR) = INTY, a interrupt has occurred
Interrupt occurs when Touch Panel is touched
Key scan enable and key pressed
Figure 6-5: RA8803/8822 Touch Panel Circuit
VDD
Figure 6-6: Control Switch of Touch Panel
RA8803
RA8822
SW0
X1
X2
Y1
Y2
XL
SW2
SW3
31/48
VDD
YU
YD
Resistor -Y
Resistor -X
GND
Two Layers Character/Graphical LCD Controller
20pF x 4
XR
Touch Panel
YU
YD
XL
XR
SW1
RA8803/8822
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