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PICList Thread
'New Pic Wishlist'
1995\07\21@091604 by Kalle Pihlajasaari

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Hi,

A belated addition to the new products wishlist.

I would like to get two bit operated instructions that are able
to move a bit (or an inverted bit) from a given file, bit to another
given file, bit in a single instruction (without having to use 4 ops
and having a 2 cycle uncertanty in the instant the move takes place).

I would settle for a move from the status file to the file pointed to
by the FSR as I can see a shortage of bits, inversion of the bit would
be useful STATUS,b -> [FSR],b and direction from [FSR],b -> STATUS,b,i
as well.  This would
only be 2 new instructions and would make highspeed bit manipulations
possible.  Currently one needs a lot of pre-work to move one bit into
an output at an exactly timed instant.  (by a lot of prework I mean 3
ops typically to read, get a literal and mask out bits, sometimes more if
you do not know what the other bits will be)

Alternatively the moves could be from immediately declared files
5, 6, 7 & 8.

IMM,b -> [FSR],b,i
and
[FSR],b -> IMM,b,i

That would be 2+3+3+1 bits of literal a total of 9 which should be
possible to sneak in to the opcodes on a 14 bit PIC.

This would also be useful for high speed interrupts.

A 50 MHz PIC would also be cool, C54 or C74 would be sufficient.

Cheers folks
--
Kalle Pihlajasaari     spam_OUTkalleTakeThisOuTspamdata.co.za
Interface Products     Box 15775, Doornfontein, 2028, South Africa
+27 (11) 402-7750      Fax: +27 (11) 402-7751

1995\07\24@070257 by eder Ferlemann

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Hi at the piclist,


To my opinion the interruptresponse time is prolonged unneccessarily
by saving the flags and working file (the trick with SWAP .. there
is an application note about it...)
I don't know if somebody has already requested the instruction (or
Microchip has even announced it):

I would like to see a single instruction to push and pop both
registers in a device like the 16C84 or 16C71.

(Or even better (though maybe not easy to implement):
The optimum would be kind of REFFIEWF which restores the registers
in a single instruction when returning from interrupt.
And the Flags and W File already saved
when the PIC starts executing at 004 (the interrupt adress))

Bye

Frieder







----
; Frieder Ferlemann
; Institut fuer Umweltphysik
; Im Neuenheimer Feld 366, Zi 410
; D-69120 Heidelberg
; Tel.: 06221 563385 oder 563334
; Fax:  06221 563405
; Email: .....FEKILLspamspam@spam@uphys1.uphys.uni-heidelberg.de
;
; To be scanned by BundesNachrichtenDienst: Embargo, G3, Police

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