topic 32bit additon on the HC08 in 8-bit Microcontrollers

32bit additon on the HC08

Bloodhound — Tue, 17 Feb 2009 19:18:45 GMT

Hi all,

I am assuming this is possible?
I need to be able to increment a number by 254 until it reaches$06000000.
Can anybody please demonstrate in assembler how this might be done?

Thanks,
Ross

Re: 32bit additon on the HC08

peg — Thu, 29 Oct 2020 08:56:55 GMT

Hi Ross,

Anything can be done, it just a matter of how much code is required.
here is a full programme that will run in GP32 simulator.

Code:

 org $40num rmb 4  ;4 bytes of storage org $8000start clr num  ;clear storage clr num+1 clr num+2 clr num+3 loop lda num+3 sta $FFFF  ;reset COP add #$FE  ;add 254 sta num+3 bcc loop inc num+2 bne loop inc num+1 bne loop inc num lda num  ;test MSByte cmp #6  ;for $06 bne loop  ;loop back if not equalend sta $FFFF  ;reset COP bra end  ;loop here when finished org $FFFE  ;reset vector dw start

Re: 32bit additon on the HC08

Bloodhound — Wed, 18 Feb 2009 08:20:52 GMT

Thanks Peg, makes perfect sense, much appreciated.

Cheers,
Ross