Subversion Repositories pentevo

        ;**************************************************************
        ;
CRST:   ; This performs system initialzation, it was moved here so the
        ; new power on reset functions could be tested in an 8751.
        ;
        ;**************************************************************
        ;
        ; First, initialize SFR's
        ;
        MOV     SCON,#5AH       ;INITIALIZE SFR'S
        MOV     TMOD,#10H
        MOV     TCON,#54H
        DB      75H             ;MOV DIRECT, # OP CODE
        DB      0C8H            ;T2CON LOCATION
        DB      34H             ;CONFIGURATION BYTE
        ;
        MOV     DPTR,#2001H     ;READ CODE AT 2001H
        CLR     A
        MOVC    A,@A+DPTR
        CJNE    A,#0AAH,$+6     ;IF IT IS AN AAH, DO USER RESET
        LCALL   2090H
        ;
        MOV     R0,#IRAMTOP     ;PUT THE TOP OF RAM IN R0
        CLR     A               ;ZERO THE ACC
        ;
        MOV     @R0,A           ;CLEAR INTERNAL MEMORY
        DJNZ    R0,$-1          ;LOOP TIL DONE
        ;
        ; Now, test the external memory
        ;
        MOV     SPSAV,#CMNDSP   ;SET UP THE STACK
        MOV     SP,SPSAV
        ;
        MOV     BOFAH,#HI(ROMADR)
        MOV     BOFAL,#LO(ROMADR+17)
        MOV     DPTR,#ROMADR    ;GET THE BYTE AT 8000H
        MOVX    A,@DPTR
        CLR     C
        SUBB    A,#31H          ;FOR BIAS
        MOV     MT1,A           ;SAVE IN DIRECT MATH LOC
        CLR     ACC.2           ;SAVE FOR RESET
        MOV     R7,A            ;SAVE IT IN R7
        INC     DPTR
        ACALL   L31DPI          ;SAVE BAUD RATE
        LCALL   RCL
        INC     DPTR            ;GET MEMTOP
        ACALL   L31DPI
        MOV     DPTR,#5FH       ;READ THE EXTERNAL BYTE
        MOVX    A,@DPTR
        MOV     DPTR,#0         ;ESTABLISH BASE FOR CLEAR
        CJNE    A,#0A5H,CRS
        MOV     A,MT1
        CLR     ACC.0           ;CLEAR BIT ONE
        XRL     A,#4H
        JZ      CR2
        ;
CRS:    CJNE    R7,#2,$+5
        SJMP    $+5
        CJNE    R7,#3,$+7
        ACALL   CL_1
        SJMP    CR1
        ;
CR0:    MOV     R3,DPH          ;SAVE THE DPTR
        MOV     R1,DPL
        INC     DPTR
        MOV     A,#5AH
        MOVX    @DPTR,A
        MOVX    A,@DPTR
        CJNE    A,#5AH,CR1
        CLR     A
        MOVX    @DPTR,A
        CJNE    R3,#0E0H,CR0
        ;
CR1:    CJNE    R3,#03H,$+3     ;NEED THIS MUCH RAM
        JC      CRST
        MOV     DPTR,#MEMTOP    ;SAVE MEMTOP
        ACALL   S31DP2          ;SAVE MEMTOP AND SEED RCELL
        ACALL   CNEW            ;CLEAR THE MEMORY AND SET UP POINTERS
        ;
CR2:    ACALL   RC1             ;SET UP STACKS IF NOT DONE
        ;
        LCALL   AXTAL0          ;DO THE CRYSTAL
        MOV     A,MT1           ;GET THE RESET BYTE
        CJNE    A,#5,$+6
        LCALL   4039H
        JNC     BG1             ;CHECK FOR 0,1,2,3, OR 4
        JNB     ACC.0,BG3       ;NO RUN IF WRONG TYPE
        MOV     DPTR,#ROMADR+16
        MOVX    A,@DPTR         ;READ THE BYTE
        CJNE    A,#55H,BG3
        LJMP    CRUN
        ;
BG1:    CLR     A               ;DO BAUD RATE
        MOV     R3,A
        MOV     R1,A
        MOV     R0,#4
        JB      RXD,$           ;LOOP UNTIL A CHARACTER IS RECEIVED
        ;
BG2:    DJNZ    R0,$            ;FOUR CLOCKS, IN LOOP
        LCALL   DEC3210+4       ;NINE CLOCKS ******AA CALL-->LCALL
        MOV     R0,#2           ;ONE CLOCK
        JNB     RXD,BG2         ;TWO CLOCKS, LOOP UNTIL DONE
        JB      RXD,$           ;WAIT FOR STOP CHARACTER TO END
        JNB     RXD,$
        LCALL   RCL             ;LOAD THE TIMER ******AA CALL-->LCALL
        ;
BG3:    MOV     DPTR,#S_N       ;GET THE MESSAGE
        ACALL   CRP             ;PRINT IT
        LJMP    CRAM