How to use internal clock on 16F88 ?

[picnewbie]

Hello

maybe a very simple question, how do I have to program the PIC16F88 to use it without external clock ?

I just want to use its internal clock at 8 MHz - I found a C instruction osccon := 0x7E; to be set through a flowcode C Command.

But then - how can I test with the EB-006 Multiprogrammer in the internal clock mode ?

And what setting do I have to apply in the PicMicro Configuration Page of PPPv3 ?

Sorry for the maybe to easy question - but I'm a real newbie in PIC Programming

Best regards

PicNewbie

[Enamul]

But then - how can I test with the EB-006 Multiprogrammer in the internal clock mode ?
And what setting do I have to apply in the PicMicro Configuration Page of PPPv3 ?

EB006 should work normally nothing to change..but need to use osccon as you mentioned in c code box in the beginning of code..and the attached config..

[picnewbie]

Hallo again,

first of all thanks for this first tip - I got the device running correct in the EB-006 with the internal clock settings - at least I think its running on the internal clock, because the LED blinks even without the quarz on the EB-006 board
and this independent of RC or XTAL setting of the switch of the EB-006 board.

One more question about using the pic with his internal clock setting outside the EB-006 environment:
So now I took the chip out of the card and put it on a very simple circuit just putting

5V to pin 14
Gnd to pin 5
and I connected a Resistor (470 Ohm) to a LEDs Anode to pin 17 the LEDs Kathode to Gnd.

I expected that the LED would blink the same way as the EBlock EB004's LED was blinking in the EB006 environment - but surprise : nothing happens ... the LED is not activated or sometimes blinks just one time then nothing happens anymore ...

What do I do wrong ?
Is there a rule about other unused pin's (ground all unused pins or something like this ?)

Thanks for some more information for a pic newbie

Best regards

[kersing]

You need to connect a pull-up to pin 4 (MCLR). In your current setup the PIC stays in reset. (An other option is to configure pin 4 to be input by setting 'RA5/MCLR Pin Function Select' to RA5 in the chip properties)

[Enamul]

Yes. You have to follow what karsing is saying.MCLR is active low reset pin for pic ic and pic remains at reset state if you don't pull it high.

[picnewbie]

Thanks a lot - that was the little detail that I was missing ...