Walter Quitt wrote:

> In other words RX can't be an EXTERN.

That's ok.

> Yikes, now that I look again jump can't be EXTERN
> either I don't think.  It's gotta be a file register and
> not some address.  Looking at the definiation of EXTERN
> directive syntax: extern ,label> [, <label> ] and labels
> are addresses neither jump or RX can be labels.

That's not correct, because a RAM location will also be
addressed as label.

variable1       RES  1

That' a label, isn't it?  (See examples in MPASM Users Guide,
DS33014G, p.77, Chapter 6.8)

Martin

;**********************************************
;**   name:      Martin Schaefer             **
;**   company:   elektronik 21 GmbH, Germany **
;**   e-mail:    schaefer@elektronik21.de    **
;**********************************************


> -----Original Message-----
> From: Quitt, Walter [mailto:wquitt@microjoin.com]
> Sent: Thursday, April 20, 2000 2:41 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: Object ASM Blues
>
>
> From the datasheet:
> bsf f,b
> where  0<=f<=255 and 0<=b<=7
> f is a file register and b is a bit number
>
> So you are supposed to be trying to set bit b in file reg f.
>
> The assembler doesn't know what b (or RX) is (or will be.)
> b is a fixed number 0 - 7 which represents which bit to set.
> So if you defined RX as a number in an include you'd be OK.
> If RX is another file register or a redefined peripheral
> register, you are out of luck.  In other words RX can't be
> an EXTERN.  Yikes, now that I look again jump can't be EXTERN
> either I don't think.  It's gotta be a file register and
> not some address.  Looking at the definiation of EXTERN
> directive syntax: extern ,label> [, <label> ] and labels
> are addresses neither jump or RX can be labels.   So I
> guess you gotta rethink what you are doing.  Looks like
> brainfad to me. :-) :-)
>
> -----Original Message-----
> From: Stephan Kotze [mailto:stephank@IAFRICA.COM]
> Sent: Wednesday, April 19, 2000 3:35 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Object ASM Blues
>
>
> Dear list
>
> I am at my wits end. Can someone please explain to me why
> MPASM won't allow
> me to do the following:
>
>     LIST P=16F874
>     include p16F874.inc
> EXTERN RX, jump
>     CODE
> RECEIVE_BYTE
> ......
>     bsf jump,RX ; set bit for jump
> .......
>     return
> end
>
> I keep getting this error when trying to make an object file
>
> Error[151]   E:\OBJECT\MAST232O.ASM 35 : Operand contains unresolvable
> labels or is too complex
>
> Stephan
>