Posted on July 03, 2018 at 08:13Hi
I use STM8S-Discovery Board with STM8S105C6 and ST Visual Develop v4.3.10, Windows 10.
If I use command ADDW or SUBW this way:
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Example 1
ldw X,&sharp400
;Load 400 into X
addw X,&sharp100
;Add direct 100 to word X
test cpw X,&sharp500
;Compare X with 500
jreq test
;Jump to 'test' if X=500
------------------------------------------------------------------------------
it works properly. The content X is 500.
But if I do this
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Example 2
k equ $0365
;RAM register is called k
mov k,&sharp100
;Move 100 into k
ldw X,&sharp400
;Load 400 into X
addw X,k
;Add k to word X
test cpw X,&sharp500
;Compare X with 500
jreq test
;Jump to 'test' if X=500
------------------------------------------------------------------------------
it doesn�t work. The content of X is not 500.
SUBW behave the same way.
According the programming manual PM004 Doc ID 13590 Rev3, page 78 and 152,
Example 2 should actually work. Issue or do I miss something?
Thanks for reply.
Ivan
#addw #subw #stm8s105c6 #basic-arithmetic #issue
