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5. Keyboard Controller
5.1 Overview
This terminal is equipped with a sub-CPU dedicated to controlling the keyboard, touch panel,
backlight, and various sensors. This chapter describes major tasks assigned to this sub-CPU.
Fig. 5.1
Main CPU Sub-CPU
Temperature Sensor
Illumination Sensor
Battery Voltage
Sensor
Buzzer
Volume
El BacklightLCD Brightness
Keyboard
Touch Panel
Command
Data