When use Reset / Px.x pin as input port, why can not read high?
1.Users need to check whether the Reset option is selected Px.x in code option, if
you choose Reset, it means that the pins is used for external reset pin;
2.Users need to check whether there is external resistor pulled up;
3.When Reset / Px.x pin is used for input pin, only when the input voltage is greater than 0.9VDD can chip read high
(ViH), while the other pin is 0.7VDD. Also, only when Reset pin input voltage lower than 0.2VDD can chip detect low
(ViL), while the other pin is 0.3VDD, users should pay attention to this when using;
4.The reset pin is only recognized to high in 0.9VDD, low in 0.2VDD, that is only when the voltage is lower than 0.2VDD
can the system enter re-set mode, only when the voltage is higher than 0.9VDD can the system works in normal state.
2.Users need to check whether there is external resistor pulled up;
3.When Reset / Px.x pin is used for input pin, only when the input voltage is greater than 0.9VDD can chip read high
(ViH), while the other pin is 0.7VDD. Also, only when Reset pin input voltage lower than 0.2VDD can chip detect low
(ViL), while the other pin is 0.3VDD, users should pay attention to this when using;
4.The reset pin is only recognized to high in 0.9VDD, low in 0.2VDD, that is only when the voltage is lower than 0.2VDD
can the system enter re-set mode, only when the voltage is higher than 0.9VDD can the system works in normal state.