jk2-1.asm

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         org 0000h
          ljmp t0start
          org  000bh
          ljmp t0int
 
          org 1100h
 t0start: mov sp,#5fh
          mov dptr,#0e100h
          mov a,#03h
          movx @dptr,a
          
          mov tmod,#01h
          mov th0,#3ch
          mov tl0,#0b0h
          mov ie,#82h
          setb tr0
          sjmp $
 t0int:   jb   f0,t0lp1
          setb f0
          mov a,#40h
          sjmp t0lp2
 t0lp1:         clr f0
          mov a,#00h
 t0lp2:         mov dptr,#0e102h
          movx @dptr,a
          reti
          END