pic first build test board not running

[comwarrior]

hi everyone...
I finally got all the hardware and wrote a little test program for my pic (16f877A)
i built a llittle test board with 8 3mm red LED's
The test program i wrote is a simple knight rider led sequence...
I'm using a 20MHz crystal with 2 X 10pf caps. the programmer was set to HS crystal...

The software runs fine in my pic simulator software but i get no signes of life...
it's running off a since lithium ion cell with a voltage under load at 4.3 volts.

i've double checked the voltage is going to both sets of pins, i've re-verified the pic program by putting pic back in the prodrammer...

I've experience building circuits with the Z80180...

Does anyone have any ideas to find whats wrong?
Thanks

[comwarrior]

i double checked the led's... they all light up...
multimeter reads 1.8v DC, 0V AC on osc1... 0.8V DC, 0V AC on OSC2 compairred to VSS
my multimeter may not be sensitive enough to detect a 20MHz xtal fluctuations

[Jumper]

Try to turn on only one (or all) at the same time and leave them on. Toggle pins on the same port rapidy after each other can give RMW (read modify write) problems when running the pic at 20 MHz.

So all on or one, but leave the blink blink for step 2

/me

[comwarrior]

here is the program i threw together in about 2 mins just for a test sequence...

Define  OSC				20
Define CONF_WORD = 0x3F72

ALLDIGITAL
TrisA	=	%00000000					'Set everything on port A as output
TrisB	=	%00000000					'Set everything on port B as output
TrisC	=	%00000000					'Set everything on port C as output
TrisD	=	%00000000					'Set everything on port D as output
TrisE	=	%00000000

main:
low 0
low 1
low 2
low 3
low 4
low 5
low 6
low 7

High 0
pause 500
Low 0
high 1
pause 500
low 1
high 2
pause 500
low 2
high 3
pause 500
low 3
high 4
pause 500
low 4
high 5
pause 500
low 5
high 6
pause 500
low 6
high 7
pause 500
Low 7
high 6
pause 500
low 6
high 5
pause 500
low 5
high 4
pause 500
low 4
high 3
pause 500
low 3
high 2
pause 500
low 2
high 1
pause 500
low 1

goto main
END

Reprogramming to turn all on and enter nop loop

[Melanie]

1. The 877A has multiple Ground and Power pins, make sure you have them all connected.

2. You did remember to do something meaningful with the MCLR pin?

3. Whilst you have defined OSC 20 for your program, you need to set HS OSC in the PIC Configuration Fuses. Whilst your program compiles wihout error, it didn't do much for the CONFIG Fuse settings for my programmer which remained at XT OSC.

4. I don't recall what the default Brown-Out is for that PIC (again my programmer reported it ENABLED by Default)... you might need to turn it OFF to run at 4.3v.

[comwarrior]

jumper:
I threw this code in and compiled it...

Define  OSC				20
Define CONF_WORD = 0x3F72

main:
TrisB	=	%00000000					'Set everything on port B as output
PORTB = 255
goto main

oshon pic simulator reports all LED's on port B light up...
again, nothing on my test board...

Mel:
I'm using WinPIC800 and JDM programmer...
I'm loading the program and then clicking on settings and selecting HS under OSC...
Please correct me if i've wrong, but i thaught the CONF_WORD set the OCS type?

Thanks