Initial

as68hc11/code/PROTO.ASM

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+PORTD  equ 08h
+DDRD   equ 09h
+SPCR   equ 28h
+BAUD   equ 2Bh
+SCCR1  equ 2Ch
+SCCR2  equ 2Dh
+SCSR   equ 2Eh
+SCDAT  equ 2Fh
+PPROG  equ 3Bh
+TEST1  equ 3Eh
+CONFIG equ 3Fh
+EEPSTR equ 0F800h             ; start of EEPROM
+EEPEND equ 0FFFFh             ; end of EEPROM
+  org 0000h
+BEGIN equ *
+  lds  00FFh                  ; initialize the stack
+  ldx  1000h                  ; initialize x register for indexed access
+  bset ix,SPCR,20h            ; put port D in wire or mode
+  ldaa 0A2h                   ; initialize SCI & restart baud divider chain
+  staa ix,BAUD
+  ldaa 0Ch                    ; receiver & transmitter enabled
+  staa ix,SCCR2        
+  bset ix,SCCR2,01h           ; send break to signal start of download
+clrbrk:
+  brset ix,PORTD,01h,clrbrk   ; clear break as soon as start bit detected
+  bclr ix,SCCR2,01h           ; clear break
+waitchar1:
+  brclr ix,SCSR,20h,waitchar1 ; wait for RDRF
+  ldaa ix,SCDAT               ; read data
+  jmp BEGIN                   ; do it forever
+
+
+
+
+