11-27.asm

详细介绍了C语言开发DSP嵌入式系统

         e      bit  p2.7
         di     bit  p2.0
         rw     bit  p2.1
         cs1    bit p2.2
         cs2    bit p2.3
         org    0000h
         ljmp   start
start:   mov    sp,#60h
         clr    ea
         lcall  delay
         mov    r0,#0c0h
         lcall  wcommand
         mov    r0,#0b8h
         lcall  wcommand
         mov    r0,#40h
         lcall  wcommand
         mov    r0,#3fh
         lcall  wcommand
         clr    p2.3
         setb   p2.2

         mov    r1,#40h
goon:    mov    r0,#0ffh
         lcall  wdata
         djnz   r1,goon
wait:    ljmp   wait
wcommand:setb   e
         clr    di
         clr    rw
         mov    p0,r0
         clr    e
         ret
wdata:   setb   e
         setb   di
         clr    rw
         mov    p0,r0
         clr    e
         ret

delay: mov   r6,#0h
delay1:mov   r7,#0h
delay2:djnz  r7,delay2
       djnz  r6,delay1
       ret