About the Enhanced Interrupt Controller

[yu-jun]

Posted on September 14, 2004 at 01:54

About the Enhanced Interrupt Controller

[yu-jun]

Posted on September 10, 2004 at 08:01

In the AN1776.PDF, the user program run in the SYS mode. when the an interrupt occurs, system jump to IRQHandler.

Why is the mode SYS mode and not USR mode? If the mode is USR mode, the routine is same.

[yu-jun]

Posted on September 14, 2004 at 01:54

Thanks, I see, but I have another question:

why to change IRQ mode to SYS mode, why does program not deal with the interrupt task in IRQ mode?