enable timer0 interrupt
55h: jnb ri,$

when tf0 is set then an interrupt occurs and program jump in vector 000Bh
after the reti the program will jump of course at 55h.
Sometimes this is bad.
I try a trick to avoid this situation...and i test it with a simulator (it works correctly) but i don't know if this works in a real situation .The code is below ...could anyone with practical experience tell me his opinion..Thanks
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ORG 0000H
JMP MAIN
ORG 0023H
JMP RECEIVE
MAIN: MOV SP,#07FH
MOV SCON,#50H
MOV TMOD,#00100000B
MOV TH1,#0D0H
ORL PCON,#80H
MOV IE,#10010000B
SETB TR1
CLR RI
WAIT: JMP WAIT
RECEIVE: MOV dptr,#3040H
PUSH 82h ;DPL
PUSH 83H ;DPH
MOV A,SBUF
MOV P1,a
clr ri
RETI
ORG 3040H
mov p1,10101010b
LJMP 0000h


without this instructions mov dptr,#3040h
and push 82h, push 83h
after the reti the programm returs in loop:
wait: jmp wait