?C?LSTKXDATA error?

i use c51 v7.5, when the code do : WFLAG = 0; // xdata unsigned long data type the pragram get error! and i see the code called ?C?LSTKXDATA . then the ?C?LSTKXDATA did POP action.. why does...
?C?LSTKXDATA error?

i use c51 v7.5, when the code do : WFLAG = 0; // xdata unsigned long data type the pragram get error! and i see the code called ?C?LSTKXDATA . then the ?C?LSTKXDATA did POP action.. why does...
can you help me friends

Hi All My Friends if i can collect some data by microcontroller AT89c51 and i can send it by RS232 to a PC how can i monitor this data from another location through the internet can one help...
can you help me friends

Hi All My Friends if i can collect some data by microcontroller AT89c51 and i can send it by RS232 to a PC how can i monitor this data from another location through the internet can one help...
friend i am doing a project on vehicle tracking system using gsm and gps ...

here while doing it i need the source code for serial.c ... kindly help