In SX Microcontrollers, SX/B Compiler and SX-Key Tool, tdg8934 wrote:

The problem I am seeing is the interupt code with RA:

 ---------------------------
INTERRUPT
' ---------------------------
ISR_Start:

RC = 0       'CLEAR DISPLAY OUT TO PREVENT GHOSTING
Inc RA       'INCREMENT COLUM ADDRESS (RA I/O PINS)
RC = NOT Display( RA )     'LOAD NEW ROW DATA TO RC

ISR_Exit:
RETURNINT 63


RA can only go from 0 (%0000) to 15 (%1111) (actually it goes from 0 to 14 (%1110) for 15 lines out). 

I need to go to 20 lines out but RA always is reset back to %0000 after it reaches 15 (%1111). How do I create another array such as:

RC = NOT DisplayExt( RA )

to push data to the remaining 5 lines when RA gets reset back to 0 (%0000) after it reaches 15 ($1111). 

I tried modifying the code to use RB as a counter but it did not work correctly. 

Please Help if you can.

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