GOTO absolut address - is that possible?

[keymuu]

Hi!

I have been looking around for some info how to jump to an absolute address (not label) but without success. So, I have not found that info...

I have a need to jump to the absolute address 0F4C.

Knowing that the banks are one byte wide and for example a bra instruction needs to calculate the address to the final location, jumping over the bank borders.

How do one calculate a long jump address?
Or how can on do that with the assembler?

If you know how to do it, please advice...

[Darrel Taylor]

@ GOTO 0x0F4C

[Ioannis]

Isn't necessary to change pages? As this is in assembly, PBP does not take care of this, I suppose.

Ioannis

[Darrel Taylor]

From another thread I saw he's using an 18F4550 with a USB bootloader.

So nope. No Pages to worry about.
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[Acetronics2]

Hi, Darrel

While on that subject ...

I use, on a 16F88 :

' If program lost

@ ORG 4094			' Pointer to the end of program
@ CLRF PCLATH			' pointer in the right page ( lol )
@ GOTO INIT 			' It's gone for another round...
'
@ END

Works and compiles fine ... BUT

No way to use Breakpoints in MPSIM when lines not commented ...

Do you have any idea about that ??? ( µChip tells ... go and see Melabs !!! - as always ... )

Alain

[Archangel]

Hi, Darrel

While on that subject ...

I use, on a 16F88 :

' If program lost

@ ORG 4094			' Pointer to the end of program
@ CLRF PCLATH			' pointer in the right page ( lol )
@ GOTO INIT 			' It's gone for another round...
'
@ END

Works and compiles fine ... BUT

No way to use Breakpoints in MPSIM when lines not commented ...

Do you have any idea about that ??? ( µChip tells ... go and see Melabs !!! - as always ... )

Alain

Hi Alain, Just curious . . . ASM comment is ; not ' yes?

[keymuu]

@ GOTO 0x0F4C

Thank you Darrel!

As not being so familiar with the assembler I did not see/realize that there is also GOTO and not just BRA. Now I know that BRA is for short jumps only and GOTO can jump anywhere.

Can you find a "good" 4550 tutorial (not datasheet) somewhere on the web?

Tanks again...

[Darrel Taylor]

Don't know of any 4550 tutorials.

The PIC18C Reference Manual has a little more info regarding the instruction set. But not enough more to be of much help.
http://ww1.microchip.com/downloads/e...Doc/39500a.pdf

Really, the datasheet has the best info available.
Once you get used to reading them, it gets easier.

Alain,

I haven't used mpsim for awhile, and there's been a few MPLAB upgrades in the mean time. I was going to try your problem, but now PBP isn't even an option in my MPLAB anymore.

I'll have to reinstall the dll again. Been too long, I forget how.
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