>
>And the 18F family actually has 3 pairs of them, along with auto inc/dec
>instructions for the FSR registers. Yet another advantage of the 18F parts.

Very AVR-ish :)  The AVR has three pointer regs, also usable as "normal" 
regs, X, Y, and Z.

So in AVR:

Point at the data, and set up how many bytes to transfer
ldi     ZL,low(Data_Array)
ldi     ZH,high(Data_Array)
ldi     Loop,Data_Array_Len

Read_Loop:
ld      TEMP,Z+

;Here, you might DO something with the data..

dec     LOOP
brne    Read_Loop


For a null terminated string in rom:

ldi     ZL,low(Data_Array*2)    ;Data is stored in WORDS in the AVR flash
ldi     ZH,high(Data_Array*2)   ;So the byte address needs to be doubled.
                                 ;The lowest bit then selects high/low byte 
of the word.

Read_Loop:
LPM     ;Data is now in R0, similar to RETLW
adiw    ZL,1    ;Inc the pointer
tst     R0      ;Is the data null?
breq    Read_Done
;Here, you might DO something with the data..
rjmp    Read_Loop

Read_Done: ;dummy label

Given that most of these instructions take only one clock (xtal) this is 
pretty fast.


_______________________________________________
http://www.piclist.com
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist