Dear all,

I am writing a program in 89c2051 using Ride51 in C. My program will read the EXT Interrupt 0 as a counter and report the no of count using serial port. The serial transmittion is using timer0 to calculate the 9600 baud rate. When a result is sending, timer0 interrupt is called, then some interrupt will be missing in Ext. Int. 0. As I know, the priority of extInt0 should higher than timer0. Hence, extInt0 should not be lost its function during timer0 Int. is using. Then, I have check the EA. It is True. Could anyone advice me how to keep EXTINT0 alway function, even the other interrupt rountine is using?

Thank you