Pic 16f873 Not Running Code While Simulator Does

Ask your instructor for help.

Break your code up into smaller routines and tasks. Verify that the smaller routines each work with being installed into the chip. Then start combining the individual routines one at a time into the chip.

A common problem that people have with simulators versus real life coding is that some simulators always start with memory registers being cleared. This will only be true with a real controller if you have an initialization circuit and code to execute clearing pertinent registers.

Thank you Redfred for your interest As I said, I was suspecting my code to be wrong, but when am trying the different subroutines like interfacing the keypad with the 7 segments and even drive the buzzer, nothing happens...I even went down to the simplest code, setting all the leds high, but still it doesn't... There is the sample program that I tried to test: List p=16f873 Status equ 03 Rp0 equ 5 Adcon1 equ 9fh Trisb equ 86h Portb equ 06 Trisa equ 85h Porta equ 05 Bsf status,rp0 Clrf trisb Movlw 0x06 Movwf adcon1 Clrf trisa Bcf status,rp0 movlw 0ffh Movwf portb Movwf porta End ; this is suppose to activate all the displays and display 888, the 7 lines to the 7 segments are on portb, 3 lines for the transistors to switch them on porta, and the buzzer also on porta...but when try it on the chip and the board nothing...am using a 4Mhz xtal, with 22pf

Ps: right now am using my phone, can't edit properly

As Lyn said earlier; you now need hands, eyes and experience that are familiar with the test hardware configuration you have. You're now experiencing the most frustrating aspect of embedded digital control, it works or it doesn't work.

Is this a purchased eval board? If so, can you reload the demo programs that came with it?

Nope its not, I made the board myself...

Check all your electrical connections and connectors, soldered joints, connectors, component orientation and connectors, connectors, etc. chances are it is a simple hardware problem.

How did you make your circuit? Breadboards with press fit components are notorious for problems (one student I knew spent a full day trying to fault find a hardware problem only to discover the breadboard itself was faulty).

Even if every thing is wired correctly the circuit may still not work if layout and design mistakes are made. One group of students I knew thought it was a good idea to fit a 40-odd pin microcontroller chip into a socket and then connect it to their main board using long soldered wires, they never got it to work.

Note that I mentioned connectors numerous times, these are the most likely component to cause problems, and unlike incorrect component orientation can be intermittent and difficult to trace.

Let us know what you find.

thank you Jack, i checked the hardware board, and it seemed to be fine, i tried the same sample flashing Led program using picbasic pro and this time it worked, i also tried a couple of other programs...now, i dont understand why it didn't work with the assembly? is there a way to convert between the 2? because am a beginner in PBP and am submitting the project by the end of this semester...