>;from EXAMPLE 5-2: INITIALIZING PORTB
>        BCF STATUS, RP0 ;
>; clearing output data latches
>        BSF STATUS, RP0 ; Select Bank 1
>        clrw    ;Set w to 0 to make all outputs.
>; initialize data direction
>        MOVWF TRISB ;All 8 bits are now outputs.

Not a problem - just a warning message that MPASM noticed that you were
writing to a register with an address higher than 0x7F.  The message is
remind you to check that you have set the ram page bits correctly.

I use macros to ensure that the message is generated only if I've been
careless.  I'll give a couple of them here - you can extend them to all the
opcodes that you may use or email me privately and I'll send the whole lot
to you.

In your case above, I'd set the ram page bits, then use
    movwf1      TRISB

No more error message.

The reason for inverting the MSB in the following macros instead of just
masking it is to make sure that I'm paying attention to what page I'm in -
if I am in page 0 and use a page 1 macro, I get the warning message.

Macros follow:

rampg0          MACRO                   ;set RAM page 0
    bcf         _RP0
    endm

rampg1          MACRO                   ;set RAM page 1
    bsf         _RP0
    endm

rampg2          MACRO                   ;set RAM page 2
    error Ram Page 2 not available on this part
    endm

rampg3          MACRO                   ;set RAM page 3
    error Ram Page 3 not available on this part
    endm


bcf1            MACRO   reg,bit         ;diddle bits in RAM bank 1
    bcf         (reg^0x80),bit          ;invert MSB
    endm

bsf1            MACRO   reg,bit         ;diddle bits in RAM bank 1
    bsf         (reg^0x80),bit          ;invert MSB
    endm


movwf1          MACRO   arg             ;diddle regs in RAM bank 1
    movwf       (arg^0x80)              ;invert MSB
    endm

movfw1          MACRO   arg             ;diddle regs in RAM bank 1
    movfw       (arg^0x80)              ;invert MSB
    endm

swapf1          MACRO   arg,d           ;diddle regs in RAM bank 1
    swapf       (arg^0x80),d            ;invert MSB
    endm

andwf1          MACRO   arg,d           ;diddle regs in RAM bank 1
    andwf       (arg^0x80),d            ;invert MSB
    endm


Dwayne Reid   <dwayner@planet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
(780) 489-3199 voice          (780) 487-6397 fax

Celebrating 15 years of Engineering Innovation (1984 - 1999)

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