; File - Echo.asm - echo the character received back to the host.  Increment
;                         it by one to prove it is not a local terminal echo.
;$$$$$$$$$$$$$ - file set up for e2 series 68hc11 with eeprom at $f800
;
; Constants
TDRE    equ     0080h
RDRF    equ     0020h
BAUD    equ     002bh
SCCR1   equ     002ch
SCCR2   equ     002dh
SCSR    equ     002eh
SCDR    equ     002fh
        lds     00FFh             ; 8E,00,0F
        ldx     1000h             ; CE,10,00
        clr     ix,SCCR1          ; 6F,2C
        ldd     330Ch             ; CC,33,0C
        staa    ix,BAUD           ; A7,2B
        stab    ix,SCCR2          ; E7,2D


dssdfsd
loop:
        brclr  ix,SCSR,20h,loop   ; 1F,2E,20,FC    wait for RDRF
        ldaa ix,SCDR              ; A6,2F          read next character
        inca                      ; 4C             increment the character   
loop2:
        brclr ix,SCSR,80h,loop2   ; 1F,2E,80,FC
        staa  ix,SCDR             ; A7,2F          echo back to host
        jmp loop                  ; 7E,00,0F       continue