Pawan Deep Narula wrote:
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Serial Interrupt Code for Tx:
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SERIAL: JB RI,RECEIVE ;If Tx receives one byte, RI
;is set, and RECEIVE is reached.

CLR TI ; else Tx transmits the byte
MOV SBUF,@R0
RETI

RECEIVE:
CLR RI
MOV P0,SBUF
RETI

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Hi Pawan,
If I am right in the SERIAL: subroutine you use the instruction JB RI,RECEIVE(remember this is a jump instruction)and in your RECEIVE:routine you have used RETI-->RETI pops address from the stack and your program hangs.

Rgds
Raj