$NOMOD51                ;der Modus fuer 8051 wird abgeschaltet
$debug
$nolist                 ;es wird kein Listing fuer reg535 erstellt
$include(C8051F340.inc) ;die C8051F340-spezifischen Daten
$list                   ;es wird ein Listing erstellt
$title (P05_MCWS08.A51)
;------------------------------------------------------------------------
;Programmbeschreibung
;------------------------------------------------------------------------
;Programm:
;Grundstellung - irgendwo zwischen auf und ab
;T2 Duty Cycle auf
;T3 Duty Cycle ab
;
;
;Erstellt am: Freitag, 10. August 2007 09:36:16 
;Programmiert: 
;
;Verwendete Einspruenge: keine
;
;Verwendete Unterprogramme: keine
;
;
;Verwendete Register und Variable:
;Registerbank(0)
;R2
;
;Kommentar:
;
;Aenderungen:
;Geaendert am: Freitag, 10. August 2007 09:36:16
;
;
;------------------------------------------------------------------------
;Initialisierungsteil fuer allgemeine Konstanten
;------------------------------------------------------------------------
INC_DUTY EQU 128
CSEG AT 0H              ;Legt absolute Codesegmentadresse auf 0h
jmp INIT
;
;------------------------------------------------------------------------
;Interrupt-Vektoren
;------------------------------------------------------------------------
ORG 05Bh
clr CF					;Counter Flag quittieren
call ISR_PCA			;Interrupt Service Routine aufrufen
reti 

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

ABFRAGE:
mov C,P1.1 				;Kopieren des Ausgangsports
mov P3.2,C
mov P3.3,C
mov P3.4,C
jmp ABFRAGE				;Warteschleife

ISR_PCA:
jnb P1.2,DUTY_CYCLE_AUF	;Flanke spaeter
jnb P1.3,DUTY_CYCLE_AB	;Flanke frueher
ret						;Aus der ISR_PCA

DUTY_CYCLE_AUF:
mov A,PCA0CPL1			;Compare P1.1 Low Byte in Akku
clr C
add A,#INC_DUTY			;Addieren mit Carry
mov PCA0CPL1,A			;wieder zurueck
mov A,PCA0CPH1			;HB
addc A,#0				;Carry addieren
mov PCA0CPH1,A			;wieder zurueck
ret

DUTY_CYCLE_AB:
mov A,PCA0CPL1			;Compare P1.1 Low Byte in Akku
clr C
subb A,#INC_DUTY		;Addieren mit Carry
mov PCA0CPL1,A			;wieder zurueck
mov A,PCA0CPH1			;HB
subb A,#0				;Carry subtrahieren
mov PCA0CPH1,A			;wieder zurueck
ret

; Peripheral specific initialization functions,
; Called from the Init_Device label
;
;PCA-Clck 3 MHz --> 1/3 MHz*65536=21,8453 ms Periodendauer
PCA_Init:
    mov  PCA0CN,    #040h		; PCA0 control
    anl  PCA0MD,    #0BFh		; PCA0 mode
    mov  PCA0MD,    #003h
    mov  PCA0CPM1,  #0C2h
    mov  PCA0L,     #018h
    mov  PCA0H,     #0F3h
    mov  PCA0CPL1,  #018h
    mov  PCA0CPH1,  #0F3h
    ret

Timer_Init:
    mov  TMOD,      #011h
    mov  CKCON,     #002h
    ret

Port_IO_Init:
    ; P0.0  -  Skipped,     Push-Pull,  Digital
    ; P0.1  -  Skipped,     Push-Pull,  Digital
    ; P0.2  -  Skipped,     Push-Pull,  Digital
    ; P0.3  -  Skipped,     Push-Pull,  Digital
    ; P0.4  -  Skipped,     Push-Pull,  Digital
    ; P0.5  -  Skipped,     Push-Pull,  Digital
    ; P0.6  -  Skipped,     Push-Pull,  Digital
    ; P0.7  -  Skipped,     Push-Pull,  Digital

    ; P1.0  -  CEX0  (PCA), Push-Pull,  Digital
    ; P1.1  -  CEX1  (PCA), Push-Pull,  Digital
    ; P1.2  -  CEX2  (PCA), Push-Pull,  Digital
    ; P1.3  -  CEX3  (PCA), Push-Pull,  Digital
    ; P1.4  -  CEX4  (PCA), Push-Pull,  Digital
    ; P1.5  -  T0  (Timr0), Push-Pull,  Digital
    ; P1.6  -  T1  (Timr1), Push-Pull,  Digital
    ; P1.7  -  Unassigned,  Push-Pull,  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
    ; P2.4  -  Unassigned,  Open-Drain, Digital
    ; P2.5  -  Unassigned,  Open-Drain, Digital
    ; P2.6  -  Unassigned,  Open-Drain, Digital
    ; P2.7  -  Unassigned,  Open-Drain, Digital

    ; P3.0  -  Unassigned,  Open-Drain, Digital
    ; P3.1  -  Unassigned,  Open-Drain, Digital
    ; P3.2  -  Unassigned,  Open-Drain, Digital
    ; P3.3  -  Unassigned,  Open-Drain, Digital
    ; P3.4  -  Unassigned,  Open-Drain, Digital
    ; P3.5  -  Unassigned,  Open-Drain, Digital
    ; P3.6  -  Unassigned,  Open-Drain, Digital
    ; P3.7  -  Unassigned,  Open-Drain, Digital

    mov  P0MDOUT,   #0FFh
    mov  P1MDOUT,   #0FFh
    mov  P0SKIP,    #0FFh
    mov  XBR1,      #075h
    ret

Oscillator_Init:
    mov  OSCICN,    #083h
    mov  CLKMUL,    #080h
    clr  A                     ; Wait 5us for initialization
    djnz ACC,       $
    orl  CLKMUL,    #0C0h
Osc_Wait2:
    mov  A,         CLKMUL
    jnb  ACC.5,     Osc_Wait2
    ret

Interrupts_Init:
    mov  EIE1,      #010h
    mov  IT01CF,    #010h
    mov  IE,        #080h
    ret

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

end