mclr pin problem for pic16f877a

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neelam29

New Member

• Mar 31, 2006

• #1

hi all

m designing a circuit using pic16f877a with interbnal adc and mclr pin is conncted directly to +5 volts.
_config 0x290A

now the problem wht m getting is my system gets hanged up whenever i start it, but as soon as i disconncet the mclr pin and reconncet it on +5 volts it starts running properly.

wht circuitry is to be placed on mclr pin of pic16f877a so that i get rid of this hanging problem.

please do help me out

 

Nigel Goodwin

Super Moderator

Most Helpful Member

• Mar 31, 2006

• #2

Connecting MCLR to Vdd is normally fine, what is the application, and how is it powered?.

 

Oznog

Active Member

• Mar 31, 2006

• #3

Often a resistor is recommended between MCLR and Vdd. 1k-10k is fine.

 

motion

New Member

• Mar 31, 2006

• #4

Try enabling power-on timer and the brown-out detect in the configuration fuses. Use the ff. configuration fuse directive instead.

Code:

 __CONFIG _BODEN_ON & _CP_OFF & _PWRTE_ON & _WDT_OFF & _LVP_OFF & _HS_OSC

 

A

altaher

New Member

• Feb 7, 2007

• #5

i am a master student in embedded system course in jordan, my last project should be an embedded system project, i pick pic16f877a microcontroller to do my project
i am very new with this pic, i try to make a central heating controller, instead of the dump controller used now

can any one help me to put my leg on the first step
thanx alot

 

phalanx

Member

• Feb 7, 2007

• #6

altaher said:

i am a master student in embedded system...

can any one help me to put my leg on the first step
thanx alot

Click to expand...

You can start by not hijacking someone else's thread.

Next would be to explain to us how a master student in embedded systems is incapable of starting a relatively simple design on their own.

 

A

altaher

New Member

• Feb 7, 2007

• #7

to

first of all , i'd like to thank u for the way u start ur message, i am really a master student.... but i try to use pic controller, which we didn't cover in the course , and collect data as i can

i am very good in programming
i 've read the data sheet of pic16f877a, and tried to take the help from u, but thanx, u replied in a very negative way

thanx alot.