Forgot to mention. The ".byte value, value,..." is where you put your
values :)


Using the PSV it is possible to store up to two byte per instruction
word. It is possible to store at most three data bytes per instruction
word, but the you would need to use "tblrd", which is a bit more awkward.


Try to learn the specificities of the 16-bit architecture, don't use it
just as a beefed-up PIC16.


Best regards,

Isaac




Em 13/7/2011 22:32, Isaac Marino Bavaresco escreveu:
> The 16-bit (data) PICs are completely different than the smaller devices.
>
> Although it may be possible to use the retlw method for reading tables
> it is extremely inefficient, there are much better options.
>
> For instance:
>
>
>         ; Initialization, needed only once
>         mov.w    #psvpage(Table),w0
>         mov.w    w0,0x0034    ; Make PSVPAG point to the page that
> contains 'Table'
>
>         bset.w    0x0044,#2    ; Activates bit CORCON.PSV
>
>
>         ; In real word this value varies
>         mov.w    #0,w0        ; The index to read
>
>         ; This assignment may be done only once
>         mov.w    #Table,w1    ; Get the address of the table
>
>         ; The important part
>         mov.b    [w0+w1],w0    ; Read the byte
>
>
>
>         .section psv,psv
>
> Table:        .byte    0x75, 0x01, 0x02
>
>
>
> Best regards,
>
> Isaac
>
>
>
>
> Em 13/7/2011 21:22, IVP escreveu:
>> Hi all,
>>
>> I'm porting some code from a 16F to a dsPIC33 and have a question
>> about PCL
>>
>> It's a simple routine to redefine a couple of LCD characters for a disk
>> file system
>>
>> The problem is that 'add PCL' does not modify PCL as I expected, in
>> either MPLAB or the actual chip. All that is returned from the fetch is
>> 16 x 0b00000010. The disassembly shows add.w 0x002e, where
>> 0x002e is the address of PCL
>>
>> The address of 'redef:' is 0xAB2C. Whatever value is in w0, the PCL
>> advances to 0xAB2E and executes the first RETLW
>>
>> I've read the d/s and PRM but find no special mention of modifying
>> PCL
>>
>> Any suggestions ?
>>
>> TIA
>>
>> Joe
>>
>> ;=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>> ;        Re-define characters
>> ;=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>>
>> redef:     mov     #16,w5         ;data byte counter
>>
>>            mov.b   #0b01000000,w0 ;send data to CGRAM
>>            call    write_c
>>
>>            clr     w4
>> get_redef: mov     w4,w0
>>            call    new_chars      ;get data into w0
>>            call    write_d        ;write to CGRAM
>>            inc2    w4,w4          ;increment index by 2
>>            dec     w5,w5          ;decrement counter by 1
>>            bra     nz,get_redef
>>            return
>>
>> ;=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D
>> ; Redefined character data
>> ;=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D
>>           =20
>> new_chars: add     PCL              ;add w0 to PCL
>>
>>            retlw.b #0b00000010,w0    ;carriage return - character 00
>>            retlw.b #0b00000010,w0
>>            retlw.b #0b00000010,w0
>>            retlw.b #0b00001010,w0
>>            retlw.b #0b00011110,w0
>>            retlw.b #0b00001000,w0
>>            retlw.b #0b00000000,w0
>>            retlw.b #0b00000000,w0
>>
>>            retlw.b #0b00010000,w0    ;backslash - character 01
>>            retlw.b #0b00010000,w0
>>            retlw.b #0b00001000,w0
>>            retlw.b #0b00000100,w0
>>            retlw.b #0b00000010,w0
>>            retlw.b #0b00000001,w0
>>            retlw.b #0b00000001,w0
>>            retlw.b #0b00000000,w0

--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.