Post by thread:[PIC]: Motorola assembly instructions

I'm trying to port some code over to the PIC from a Motorola 68HC series chip (ugh). Anyone have an instruction set that I can reference for this? You haven't given enough numbers to specify an instuction set yet. There are (roughly) 68HC00, 68HC05, 68HC08, MC6809, 68HC11 and 68HC12 in the "small microcontroller" range, all with significant architectural differences (I think some or all might be considered by some to be "logical extensions" of one another.) Then you get to the 68HC000 and later higher-powered microprocessors... In any case, all the databooks are online at http://www.mot-sps.com/ BillW -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

Drew Vassallo wrote: >Hey, > >I'm trying to port some code over to the PIC from a Motorola 68HC series >chip (ugh). Dirty and nonoptimal executing codespace and ramspace... but maybe less work and full compatible and safe, if: you can create macros named exactly as the 68xx instructions, and then just paste the original code?? Macros use file register for A, X SP and stack etc. OK, timing goes out the door, and of course rewrite pheripheral use, investigate call stack depth, etc. Just a quick idea... Regards /Morgan -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email .....listservKILLspam@spam@mitvma.mit.edu with SET PICList DIGEST in the body

At 08:24 PM 1/24/01 -0500, you wrote: >Hey, > >I'm trying to port some code over to the PIC from a Motorola 68HC series >chip (ugh). Anyone have an instruction set that I can reference for this? >It's tough to make out the instructions, as they really don't relate >directly to PIC assembly. I presume you've downloaded the technical manuals for the relevant 68HC chip from Motorola's web site. It's all in there. The Motorola CPUs are generally a bit more capable than the PIC, so you may find you need a few more instructions here and there to handle things like multiple precision math. Probably the overall organization of the program is ok, but it might be better to rewrite each subroutine in PIC assembler rather than trying to go instruction-by-instruction. Might make sense to change byte order in some cases as well. The Motorola CPUs also allow execution of code in RAM, manipulation of the stack (generally) and so on, which have no direct equivalent in the lower end PICs, so the difficulty of the code can vary by how the original program was written. Best regards, =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Spehro Pefhany --"it's the network..." "The Journey is the reward" speffKILLspaminterlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com Contributions invited->The AVR-gcc FAQ is at: http://www.bluecollarlinux.com =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= -- http://www.piclist.com hint: To leave the PICList .....piclist-unsubscribe-requestKILLspam.....mitvma.mit.edu

Here are some macros i've been using and fiddling with. They are not complete, and a few might not even be right, but it would get you started: alice ;motmacro.asm list p=16c84 radix dec #include p16c84.inc __CONFIG _LP_OSC & _WDT_OFF &_PWRTE_ON & _CP_OFF ;---------------------------------------------------- ;cpu equates (memory map) status equ 0x03 porta equ 0x05 portb equ 0x06 trisa equ 0x85 trisb equ 0x86 ;yes i know, but i hate uppercase. cblock 0x10 temp tempa wtemp answer endc c = 0 z = 2 w = 0 ;work reg f = 1 ;file reg _pd = 3 _to = 4 ;----------------------------------------------------- org 0x00 nop ;this program is mostly used in simulator. goto tryout ;------------------------------------------------------ ;various macros in no particular order ;macro area ;compare literal in work cmpl macro value ;nondestructive movwf wtemp sublw value swapf wtemp,f swapf wtemp,w endm ;compare file in work cmpf macro file movwf wtemp movfw file subwf wtemp,w endm ;branch not equal bne MACRO fr1,fr2,address movf fr2,W subwf fr1,W btfss 3,2 goto address ENDM ;branch if equal beq MACRO fr1,fr2,address movf fr2,W subwf fr1,W btfsc 3,2 goto address ENDM ;branch if less blo macro address btfss status,c goto address endm ;branch if higher bhi macro address btfsc status,c goto address ENDM ;branch if plus-- test bit 7 set bpl macro file,address ;???? movfw file andlw b'10000000' btfsc status,z goto address ENDM ;branch if minus-- test bit 7 set bmi macro file,address ;???? movfw file andlw b'10000000' btfss status,z goto address ENDM ;branch less than or same bls MACRO fr1,fr2,address movf fr1,W subwf fr2,W btfsc 3,0 goto address ENDM bhs MACRO fr1,fr2,address movf fr2,W subwf fr1,W btfsc 3,0 goto address ENDM cmp macro file movwf wtemp movfw file subwf wtemp,w endm txa MACRO address movfw indf ENDM ldx MACRO address movwf fsr ENDM atx MACRO address movfw indf ENDM ldaf MACRO address movfw address ENDM ldal MACRO L movlw L ENDM bra MACRO address goto address ENDM rts MACRO RETURN ENDM sta MACRO address movwf address ENDM jsr MACRO address call address EMDM jmp MACRO address goto address ENDM sub MACRO address,fr1 ;CHECK THAT FILE SUBTRACTS FROM WORK movfw fr1 subwf address,F ENDM nega MACRO MOVWF wtemp comf wtemp,w ENDM stx MACRO movwf fsr ENDM ;sta movwf whatever sbc MACRO address subwf address, F ENDM subw MACRO address subwf address,f ENDM ;---------------------------------------------------- tryout movlw .8 movwf tempa movlw .8 movwf temp movlw .5 nop cmp tempa bhi true ; bne temp,tempa,true ; movwf answer false stopit goto stopit true orbit goto orbit ;---------------------------------------- end ;%)%)%)%)%)%)%)%)%)%)%)%)%)%)%)%)%) -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

> >Here are some macros i've been using and fiddling with. They > >are not complete, and a few might not even be right, but it > >would get you started: > > > >alice > > >sub MACRO address,fr1 ;CHECK THAT FILE SUBTRACTS FROM > >WORK > > movfw fr1 > > subwf address,F > > ENDM > > > > Was that comment a "note to self"? 'Cuz I checked my wall (I have > it tacked to the wall since there's no way to make sense of it) and > it says SUBWF does f - w !! yes, thanks Barry, you have sharp eyes. i always have to look that one up or run it through the simulator to see if i get what i think i want. this was snipped from a work in progress, that still has some distane to go. alice -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.