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UM0240 データシート(PDF) 22 Page - STMicroelectronics |
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UM0240 データシート(HTML) 22 Page - STMicroelectronics |
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22 / 39 page  Switches UM0240 22/39 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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