Table of Contents
Advertisement
Figure 14-2. Coordinate Detection Equivalent Circuits
TPY1 pin: 3 V
TPY0 pin: 0 V
TPY0 pin
TPX0 pin: 3 V
V
R
Touch panel
General-purpose
A/D ports,
Audio input port
CHAPTER 14 TOUCH PANEL INTERFACE UNIT (PIU)
(a) Y-coordinate detection
TPX0 pin
V
Y1
(b) X-coordinate detection
V
X1
TPX1 pin: 0 V
Figure 14-3. Internal Block Diagram of PIU
4181
Scan sequencer
Touch panel
interface controller
User's Manual U14272EJ3V0UM
TPY1 pin: 0 V
TPY0 pin: 3 V
TPY0 pin
V
X2
TPX0 pin: 0 V
PIU
Internal bus
controller
PIU registers
A/D converter
V
Y2
TPX0 pin
TPX1 pin: 3 V
Internal bus
277
Advertisement
Table of Contents
