Having some problems with 89C51RE2

[DaMeN]

My micro does not respond to the programs that I write to him.
In the begining of the project I wrote a program to see if it works:

#include<REG51_2> \\ I added the origional librarry and changed its name...

void main()
{
PCON=0;
TMOD=0x20;
TL1=0xFD; \\ BAUD RATE 9600
TH1=0xFD;
TR1=1;
TF1=1;
SM0=0
SM1=1
SM2=0
REN=0
EA=1
ES=1
ET1=1
EX0=1

P1=0xFF;
P2=0xFF;
}

After I tested that program and it worked I added some chips that are undirectly connected to the micro, and now the program does not work. The only chip that connected to the micro are MAX233, DS1232 and FPGA. I changed the MAX and the DS and checked the FPGA that its works. I even connected the micro only to the voltage out side my electronic board and it stil doesnt work. by the way I tried another two microes and its stil the same.

Please help im out of idies...
I would be happy even if you send me an email or contact me on my messenger: damen63@hotmail.com