Blink.bas Program

[merlinknight]

How does the blink.bas program know to use port b without now trisb or port commands, just high or low, and how can it be changed.

[HenrikOlsson]

Hi,
I think I'll just quote the manual on this:


HIGH Pin

Make the specified Pin high. Pin is automatically made an output. Pin may be a constant, 0-15, or a variable that contains a number 0-15 (e.g. B0) or a pin name (e.g. PORTA.0).


There's more info in the manual....

/Henrik Olsson.

[merlinknight]

I read the manual. Here is the program, i still don't understand this with Microchip Pic 18f4520.

loop:
High 0 ' Turn on LED connected to PORTB.0
Pause 500 ' Delay for .5 seconds

Low 0 ' Turn off LED connected to PORTB.0
Pause 500 ' Delay for .5 seconds

Goto loop ' Go back to loop and blink LED forever
End

Tell me what, in this program, states PortB pin 0. How is it configured?

[Acetronics2]

Hi,

NOooooooo,

You didn't read your manual ... have a closer look to the TABLE in § 4.11 "PINS" ... page 26 Bottom.

Everything explained ...

Now, for your own sake ... much better to Write " High Portb.0 " !!!

and FULLY use the example shown in page 6 ... of the Manual !!! not that from a STAMP example ... even if compatible.

Alain

[merlinknight]

Thanks for the reply. I did not look at that table because of it saying BASIC stamp.
You are correct. That is the area to explain the reason it works.
I will go back and read the manual again this time not skipping info on BASIC STAMPS just i ncase i run into this problem again.

Thanks,
Merlin Knight