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OK, I'm a novice with the 8051. How do you map a port pin to an external interrupt (or visa versa, say External interrupt 2)? I'm assuming that there are no dedicated pins for each of the seven Ex. interrupts on my chip and they have to be assigned somehow to a pin/bit on a specific port. Is this assumption correct? -Michael
Hi Neil, most of the 8051 core ASIC, having 2 or 4 timer interrupt, it may have 1 serial interrupt,1 from Divider(use for RTC), 1 comparator, 1 watch dog timer. In addition to this application decide iSR such as CID(caller ID), There may be 2 or 4 External interrupt. There are some asic which called keyboard interrupt, which mostly 4 pin,