© 2001 Ubicom, Inc. All rights reserved. - 8 - www.ubicom.com AN38 Asynchronous Transmitter & Receiver (UART) Virtual Peripheral Implementation isrThread6 ; Serviced at ISR rate/16 jmp isrOut     ; 7 cycles until mainline program resumes    ; execution isrThread7   ; Serviced at ISR rate/16 jmp     isrOut            ; 7 cycles until mainline program resumes    ; execution isrThread8           ; Serviced at ISR rate/16 jmp   isrOut            ; 7 cycles until mainline program resumes    ; execution isrThread9 ; Serviced at ISR rate/16 jmp isrOut            ; 7 cycles until mainline program resumes    ; execution isrThread10 ; Serviced at ISR rate/16 jmp    isrOut            ; 7 cycles until mainline program resumes    ; execution isrThread11 ; Serviced at ISR rate/16 jmp isrOut ; 7 cycles until mainline program resumes    ; execution isrThread12 ; Serviced at ISR rate/16 jmp isrOut           ; 7 cycles until mainline program resumes    ; execution isrThread13 ; Serviced at ISR rate/16 ; This thread must reload the isrMultiplex register reload isrMultiplex so isrThread1 will be
; run on the next interrupt. This thread must reload the isrMultiplex register since it is
; the last one to run in a rotation. _bank Multiplexbank    mov isrMultiplex,#255 jmp isrOut ; 7 cycles until mainline program resumes    ; execution isrOut ; Set Interrupt Rate Isrend ; refresh RTCC on return (RTCC = 217-no of instructions executed in the ISR) mov w,# -intPeriod retiw ;return from the interrupt ; End of the Interrupt Service Routine