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please have a look at program below #define LMCODE PBYTE[0xfe] /* below is a signal function signal void my_signal (void) { while (1) { rwatch (x:0xfe); _wbyte(x:0xfe,0x0b); } } why i go into a endless loop when i use a sentence like this: while((LMCODE & 0x03)!=0x03) {}
thank you. but as i think 1.your current design of c51 can not work correctly when user want to use P2 as I/O port and at the same time using pdata for some other purpose. 2. why don't you put pdata at the begining of xdata? i think this is just the practical position it should reside.