Oki MSM85C154HVS - Priority Interrupt Routine Flow

INTERNAL SPECIFICATIONS
133
4.7.3.1 Priority interrupt routine flow
The flow of interrupt processing when a priority interrupt is generated and processed after a
routine has been commenced by a non-priority interrupt generated during execution of a main
routine program is outlined in Figure 4-45 below. This diagram shows the flow chart up to the
point of return to the main routine.
NI
Start of non-priority interrput
Start of non-priority interrput
priority interrput routine
RETI
Non-priority interrput routine
PI
NI
RETI
Generation
of interrput
M
Main routine
Generation
of interrput
M
Main routine
Figure 4-45 Interrupt processing flow chart when priority circuit is activated