The PIC does not start its program.

[Ted's]

I assembled my new pic 16f628a circuitry. The PIC does not start its program.

My checklist:

Voltage: +5V Pin 14, Mass Pin 5 OK
Osc 20Mhz quarz: Pin 15 and Pin 16 OK - I only have a multimeter, so what I found is that values change between 0 and +5V, I assume a sine wave.
Program: PIC is being programmed well according to software. As usual.

PIC Program

@ DEVICE MCLR_OFF
@ DEVICE hs_osc
@ DEVICE wdt_off
@ DEVICE lvp_off
@ DEVICE protect_off

Define OSC 20
INTCON = 0
CMCON = 7
TRISB = %00100100
TRISA = %11111100

LED_Kalib VAR PORTB.7
LED_Halb VAR PORTB.4
LED_Voll VAR PORTB.6
LED_Besch VAR PORTA.0
LED_OK VAR PORTB.0

Low LED_Kalib
Low LED_Halb
Low LED_Voll
Low LED_Besch
Low LED_OK
High LED_Kalib
High LED_Halb
High LED_Voll
High LED_Besch
High LED_OK
Pause 500
Low LED_Kalib
Low LED_Halb
Low LED_Voll
Low LED_Besch
Low LED_OK

Anything missing in the checklist? Any ideas on how to solve the issue?

[gringobomba14]

So, you're switching on 5 LED's then switching them off again. That routine will run only once, and in fairness, there is in theory only half a second between the ON and OFF sequence. Do you have 5V on the MCLR pin?

[Ted's]

There is a 22kOhms resistor from +5V to RA5 and from RA5 to Mass is a push-button. So without pressing the button it is +5V. But that shouldn't be important because of "@ DEVICE MCLR_OFF".

[Archangel]

You might try using upper case letters in those DEVICE STATEMENTS and DEFINE. http://www.picbasic.co.uk/forum/showthread.php?t=558

[Ted's]

I did. This did not change anything.

I used this code before and it worked with exactly this chip.

I replaced the pic and it still did not work.

Do you know a better way of measuring the pic's quarz using a multimeter? I presume that having a 20Mhz Quarz is way out of this device's possibilities.

[Ted's]

*deleted****

[skimask]

Get back to basics...
For on thing...

.......DEVICE statements, PIC Setup statements etc.
All LEDs are set OFF
All LEDs are set ON
Wait for 1/2 second
Turn all LEDs all

It runs one time, and one time only. Don'tcha think it would be better to continuously blink the LEDs so you have time to probe around and see what's going on?

@ DEVICE MCLR_OFF
@ DEVICE hs_osc
@ DEVICE wdt_off
@ DEVICE lvp_off
@ DEVICE protect_off
Define OSC 20
INTCON = 0 : CMCON = 7 : TRISB = %00100100 : TRISA = %11111100
LED_Kalib VAR PORTB.7 : LED_Halb VAR PORTB.4 : LED_Voll VAR PORTB.6
LED_Besch VAR PORTA.0 : LED_OK VAR PORTB.0
main: Low LED_Kalib : Low LED_Halb : Low LED_Voll : Low LED_Besch : Low LED_OK
pause 500
High LED_Kalib : High LED_Halb : High LED_Voll : High LED_Besch : High LED_OK
Pause 500
goto main
END

[Ted's]

Not right now, skimask.

The issue is that the pic is not even starting its programme.

I want to give you more information. When voltage is being applied to the circuitry, these levels are given on the pic's socket:

RA3 = Undefined, Floating
RA4,RA5,RB2,Vdd,RB5 = 5.01 Volts
RA7,RA7 = OSC

[skimask]

Not right now, skimask.
The issue is that the pic is not even starting its programme.
I want to give you more information. When voltage is being applied to the circuitry, these levels are given on the pic's socket:
RA3 = Undefined, Floating
RA4,RA5,RB2,Vdd,RB5 = 5.01 Volts
RA7,RA7 = OSC

That's EXACTLY the issue. If you break it down into it's simplest form, you can probe around, put parts in, pull parts out, play around, without worrying about anything.
And again, YOUR program only execute ONE TIME. Are you going to sit there and keep pressing RESET while you mess around trying to probe?

[Ted's]

Do you recommend soldering on a running system?

To me it is about what is given the first time when voltage is being applied. Or will it work if I replace the quarz while there is already voltage applied to vdd and vss? I doubt so.

[skimask]

Do you recommend soldering on a running system?

If it's only 5v and you've only got a PIC, an LED, a resistor, and the rest of the glue that goes with, sure...why not?