NEC Barracuda Service Manual page 22

Pda
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Barracuda PDA Maintenance
Each of the four touch screen signals can be selected as input for the built-in 10-bit ADC, which is used to
determine the voltage on the selected touch screen pin. The flexible switch matrix and the multi-functional touch
screen bias circuit enables the user of the UCB1300 to set each desired touch screen configuration.
Block diagram of the touch screen interface
21

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