RA.4 Open collector,...

[rsocor01]

The reason that you need a resistor between RA4 and Vcc, like Gadelhas mentioned above, is because RA4 in that chip is an Open Drain (OD) type.



Robert

[tazntex]

Sorry about the delay getting back to ya'll. Ok, your instructions said:
1 - Connect the RA4 Pin with the resistor to VCC;
2 - Connect the anode of the led beetwen the resistor and the RA4 Pin;
3 - Connect the Cathode of the led to GND

with or without step 2 the led is illuminated.

Thanks for the fast response.

[Bruce]

RA4 is C2OUT with the 1st configuration you had so you couldn't use it for a digital output. With comparators disabled you can.

This should work fine to drive your LED on RA4 ---|<|---/\/\/--VCC.

[tazntex]

Bruce, thats how I have it, However, I have brown out reset enable on my winpic programmer software, tried it with PICkit3, PICkit2 and it won't work, BUT if I turn off the brown out reset manually in WINPIC programmer, It WORKS
But I am going from 9v input to my breadboard, then LP2950ACZ-3.3 (3.3V) regulator to my processor, sure would be nice to use the low voltage (brown out).

Any ideas?

Thanks

[Bruce]

If turning an LED on is tripping reset you might want a larger cap on the reg output or larger series resistor for the LED. BOR definitely shouldn't trip unless you're dropping a lot of power.

Edit: Check the datasheet for Vbor. You may already be running marginal.

[tazntex]

I'll do that this evening, Thanks to everyone for your help.

[tazntex]

I did read about the Vbor, but also in the electrical specifications, it state minimum brown out reset voltage is 3.65V. Using a 3.3V regulator I rekon that cuts that out of the picture.

Well, I don't mean to get off of my original thread but since I am here and ya'll are reading this...
When using Darryl Taylors Interrup's and MPASM how does one set the config bits,thats where I can turn it off, I have been using this PBP compiler with sucess :
@ DEVICE PIC16F628a,XT_OSC
@ DEVICE pic16F628a, WDT_OFF
@ DEVICE pic16F628a, PWRT_ON
@ DEVICE pic16F628a, MCLR_ON
@ DEVICE pic16F628a, BOD_OFF
@ DEVICE pic16F628a, LVP_OFF
@ DEVICE pic16F628a, CPD_OFF
@ DEVICE pic16F628a, PROTECT_OFF
I have even opened the 16F628A.INC in the PBP directory and it is turned off with the above added to my code when I compile using MPASM it won't compile, I get a bunch of errors. If I delete the above it compiles fine.
Meanwhile, I am reading Melanie's post again to see what I've missed: http://www.picbasic.co.uk/forum/cont...o-your-Program
Thank you