User`s guide

Hardware Interrupts

Thread Scheduling 4-17

Run State: This state is entered when you use a run command from the

debugger interface. CPU services all the interrupts, depending on the INTM

bit and the IER register value.

Figure 4-4. The Interrupt Sequence in the Run-time State

Yes

Interrupt request sent to CPU

Check INTM bit

Check IER bit

Clear corresponding IER bit

Empty pipeline

Increment and temporaril

store PC

Fetch interrupt vector

Increment SP by 1

Perform automatic context save

Clear corresponding IER bit

Set INTM & DBGM, Clear loop,

EALLOW, IDLESTAT

Load PC with fetch vector

Execute interrupt service routine

Program continues