For example, bit two may possibly be established this means that the serial port has concluded shifting a byte in or out but if you deliberately are not working with interrupts for your serial port operations, you would not have had the corresponding bit in the IER (interrupt help sign up) set, this means that the "change done" status was not what pulled the IRQ line down.
Burtoncartle
Burton Cartledge
is a Semiconductor processing technician
from
Munchen