problem in configuring pins as inputs in 16F628A

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hemnath

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Hi,
I worked lots of projects using PIC18 microcontroller.
Now I am in need of using PIC16F628A for a project. Crystal used 6.144Mhz.
I have configured the B4-B7 pins as inputs using TRIS register.

TRISB = 0b11110000;

But when i measure the voltage at B7 pin, it shows +5V. I have left the pin open.

What could be the problem.

Thanks in advance
 

try pulling them down through 10 k resistor to ground if you want them to be initialized to be zero always .Also when a port is generally set as input it has a floating value so it is generally in the range of 3 to 5 v So this might be the case here . Also check POR values of the PORTB ,and OPTION_REG for RBPU . Also first thing to check would be board connections as mentioned above .
 

Please check the file. I have connected like this in my hardware.
when the switch is open, Voltage across R2-R3 is around 4V.
 

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yeah ok ..
But i don't think that those resistor value could cause the problem. They are used to limit the current.

Let me check it and get back to you soon.

Thank you
 

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