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Although i connot get answers to my questions i continue asking......
Can i connect VCC pin of R8C/1B to 3.6V and Vref pin to 5V? I mean Can Vref of A/D converter be connected to a source greater than Vcc of the MCU?
today i saw an odd situation. i have a circuit on which there is a receiver module with a digital output and the output is directly connected to an input pin of an mcu. i observed the digital data output of the receiver and saw normal parasitic data. but when i connect to the mcu...
there is a return path(GND) of course but what i mean by saying earth is the third of the mains supply: Phase-Neutral-EARTH. DC adaptors dont have the earth connection. as far as i know shield is connected to earth.
we designed an electronic card which is supplied by a dc adapter(i.e. no safety ground connection). the card is in a box and the box is shielded. i wonder where should i connect the shield? because there is no earth connection.
i want to use a button from 5-8 meters to the circuit. sometimes the button does not function properly. the button is connected to the pic's port and there is a pull-up resistor. when the button is pushed the port is pulled to GND