ST STMPE2401, Руководство пользователя, Страница: 10 / 22

Running the STMPE2401 port expander demo board UM0300
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Figure 10. Embedded 4x4 keypad
2.1.3 Dedicated keypad demo
Similar to normal Key press, there are 4 dedicated keys available on the demo board as
shown in
Figure 11 . In comparison to normal keypad where you can detect only 2 keys
simultaneously, here you can observe 4 dedicated keys simultaneously. All dedicated key
press events are displayed in LCD screen.
Figure 11. Dedicated keys
2.1.4 Rotator demo
The interface of Rotator is implemented in multiplexed manner with the keypad. That is
either you will observe any key press event on the LCD or the Rotator event. The rotator is
implemented using three switches as shown in
Figure 12 .