2017-05-10 12:00:41 +02:00
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;TPicSim10
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;Programm zum Test des 16F84-Simulators.
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;Es wird die richtige Funktionsweise von PCL und PCLATH am Beispiel
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;eines Tabellenzugriffs getestet
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;(c) St. Lehmann
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;19.04.2014
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;Definition einiger Symbole
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indirect equ 0
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pcl equ 02h
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status equ 03h
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fsr equ 04h
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ra equ 05h
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rb equ 06h
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pclath equ 0ah
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intcon equ 0bh
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;Definition des Prozessors
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device 16F84
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;Festlegen des Codebeginns
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org 0
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start
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movlw 0 ;Index f?r Tabellenzugriff in 0FH
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movwf 0fh
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movlw 5 ;insgesamt 5 Tabellenzugriffe
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movwf 0eh
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movlw 10h ;Ergebnis wird ab 10H abgespeichert
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movwf fsr
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loop
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movlw 1 ;PCLATH setzen, damit auf den Bereich 256-511 zugegriffen werden kann
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movwf pclath
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movf 0fh,w
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call tabelle
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movwf indirect
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incf fsr
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incf 0fh
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decfsz 0eh
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goto loop
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clrf pclath
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movf 0fh,w
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call tabelle ;Fehler, der ADDWF PCL kommt nicht in die Tabelle. Grund: in W steht 5
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;im PC 109 bzw. nach dem Fetch 10A. Zu diesem Wert wird 5 addiert und
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;die oberen Bits auf 0 gesetzt (PCLATH=0). Damit steht im PC der Wert
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;0Fh. Dorthin springt der PIC durch den ADDWF-Befehl. Hier verweilt
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;das Programm w?hrend der Stack immer weiter w?chst.
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ende
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goto ende ;Endlosschleife, verhindert Nirwana
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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Tabelle
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addwf pcl
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retlw 60h
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retlw 61h
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retlw 62h
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retlw 63h
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retlw 64h
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retlw 65h
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retlw 66h
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retlw 67h
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retlw 68h
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retlw 69h
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retlw 6Ah
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