Subroutines are similar to concept of functions in C/C++. In 6811, in order to call a subroutine you can use the instruction: JSR
So your code would be something like:
ORG $C000
; some initialization code
JSR stringLength
; more code ...
; e.g.
CLRA
LDAA #$40
;further down in your code you define your subroutine
stringLength
;; your subroutine code will go here
;; e.g.
ORAA $0F
RTS ; return from subroutine
The following video describes how to use and implement subroutines in 68HC11:
So your code would be something like:
ORG $C000
; some initialization code
JSR stringLength
; more code ...
; e.g.
CLRA
LDAA #$40
;further down in your code you define your subroutine
stringLength
;; your subroutine code will go here
;; e.g.
ORAA $0F
RTS ; return from subroutine
The following video describes how to use and implement subroutines in 68HC11:
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