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
 

both resistors in series shd have 10k... if u didnt got output, post project file.....
 

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