In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Tony Leyland wrote:

Hi,

I've been working on utilising 2 or more VPs.  I've read the Scenix PDF on VP methodology and understand the principles of
multitasking (as shown below)

inc	isrMultiplex
mov	w,isrMultiplex
jmp	pc+w
jmp	isrThread1
jmp	isrThread2 
jmp	isrThread3

etc etc

isrThread1:    ; VP 1 code here

jmp 	isrOut
;-----------------------------

isrThread2:   ; VP 2 code here

jmp 	isrOut
;-----------------------------

isrThread3:   ; VP 3 code here

mov    isrMultiplex,#255
jmp 	isrOut
;-----------------------------

isrOut:

mov 	w,#-int_period
retiw



I understand how to have one VP running at 9600 (for a UART say) and having another VP running at 2,4,8 or 1/2,1/4,1/8 of the 9600 rate like this:

jmp	pc+w
jmp	isrThread1
jmp	isrThread2 
jmp	isrThread1
jmp	isrThread3
jmp	isrThread1
jmp	isrThread4

Does anybody know of a way to have 2 VPs running.  One at other frequencies that are not multiples/divisions of the 9600 rate (100Khz say for example)
and another VP running at the 9600 rate ?

Thanks in advance
Tony

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