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UM0240 bảng dữ liệu(PDF) 22 Page - STMicroelectronics

tên linh kiện UM0240
Giải thích chi tiết về linh kiện  ST Industrial Communication Board - EVALCOMMBOARD
PDF  39 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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UM0240 bảng dữ liệu(HTML) 22 Page - STMicroelectronics

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Switches
UM0240
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7
Switches
The board is equipped with five switches: a microcontroller reset switch (RES), and four
general purpose switches (SW1, SW2, SW3 and SW4).
The RES switch is directly connected with the microcontroller RESET pin used to perform a
hardware reset of the MCU. In order to guarantee the correct timing for the RESET negative
pulse, an RC network is connected to the switch.
General purpose switches are connected to the AD converter embedded on the
microcontroller (Channel 0 is used) through a resistor divider network.
Figure 8.
General purpose switches
Each time a key is pressed, the corresponding resistor divider is activated. Then the voltage
read by the ADC tells the microcontroller which button has been pressed.
Figure 9.
General purpose switches voltages and decisions level



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