$NOMOD51                ;der Modus fuer 8051 wird abgeschaltet
$debug
$nolist                 ;es wird kein Listing fuer reg535 erstellt
$include(C8051F320.inc) ;die C8051F340-spezifischen Daten
$list                   ;es wird ein Listing erstellt
$title (PWM_LED_25_50_75.A51)
;------------------------------------------------------------------------
;Programmbeschreibung
;------------------------------------------------------------------------
;Programm:
;T1 --> gibt an
;P0.0 - PWM mit Duty Cycle 25%
;P0.1 - PWM	DC 50%
;P0.2 - PWM DC 75%
;
;Erstellt am: Sonntag, 22. November 2009 20:43:42 
;Programmiert:   
;
;Verwendete Einspruenge: keine
;
;Verwendete Unterprogramme: keine
;
;
;Verwendete Register und Variable:
;Registerbank(0)
;R2
;
;Kommentar:
;
;Aenderungen:
;Geaendert am: Sonntag, 22. November 2009 20:43:42
;
;
;------------------------------------------------------------------------
;Initialisierungsteil fuer allgemeine Konstanten
;------------------------------------------------------------------------


CSEG AT 0H              ;Legt absolute Codesegmentadresse auf 0h
anl  PCA0MD,    #0BFh	;WDTE = 0  Watchdog aus
jmp INIT
;
;------------------------------------------------------------------------
;Interrupt-Vektoren
;------------------------------------------------------------------------
;ORG 

;------------------------------------------------------------------------
;Initialisierungsteil fuer On-Chip Peripherie
;------------------------------------------------------------------------
ORG 100H                ;Programmstart bei 100H
INIT:
call Init_Device		;Aufruf zur Initialisierung der Controller Funktionen

;------------------------------------------------------------------------
;Programmschleife
;------------------------------------------------------------------------

ABFRAGE:
jnb P1.1,PCA_R		;Start PCA-Timer
jmp ABFRAGE

PCA_R:
mov PCA0CN,#0x40	;Start PCA0-Zeitgeber/Zaehler
jmp ABFRAGE

; Peripheral specific initialization functions,
; Called from the Init_Device label
PCA_Init:
    anl  PCA0MD,    #0BFh
    mov  PCA0MD,    #008h
    mov  PCA0CPM0,  #0C2h
    mov  PCA0CPM1,  #0C2h
    mov  PCA0CPM2,  #0C2h
    mov  PCA0CPM4,  #048h
    mov  PCA0CPL4,  #0E9h
    mov  PCA0CPH0,  #0C0h
    mov  PCA0CPH1,  #080h
    mov  PCA0CPH2,  #040h
    ret

Port_IO_Init:
    ; P0.0  -  CEX0 (PCA),  Open-Drain, Digital
    ; P0.1  -  CEX1 (PCA),  Open-Drain, Digital
    ; P0.2  -  CEX2 (PCA),  Open-Drain, Digital
    ; P0.3  -  Unassigned,  Open-Drain, Digital
    ; P0.4  -  Unassigned,  Open-Drain, Digital
    ; P0.5  -  Unassigned,  Open-Drain, Digital
    ; P0.6  -  Unassigned,  Open-Drain, Digital
    ; P0.7  -  Unassigned,  Open-Drain, Digital

    ; P1.0  -  Unassigned,  Open-Drain, Digital
    ; P1.1  -  Unassigned,  Open-Drain, Digital
    ; P1.2  -  Skipped,     Open-Drain, Digital
    ; P1.3  -  Skipped,     Open-Drain, Digital
    ; P1.4  -  Skipped,     Open-Drain, Digital
    ; P1.5  -  Unassigned,  Open-Drain, Digital
    ; P1.6  -  Unassigned,  Open-Drain, Digital
    ; P1.7  -  Unassigned,  Open-Drain, Digital
    ; P2.0  -  Unassigned,  Open-Drain, Digital
    ; P2.1  -  Unassigned,  Open-Drain, Digital
    ; P2.2  -  Unassigned,  Open-Drain, Digital
    ; P2.3  -  Unassigned,  Open-Drain, Digital

    mov  P1SKIP,    #01Ch
    mov  XBR1,      #043h
    ret

Oscillator_Init:
    mov  OSCICN,    #081h
    ret

; Initialization function for device,
; Call Init_Device from your main program
Init_Device:
    lcall PCA_Init
    lcall Port_IO_Init
    lcall Oscillator_Init
    ret

end