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MSM80C154S/83C154S/85C154HVS
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4.7.5.3 Interrupt response time chart when an ordinary instruction is executed after
temporarily returning to the main routine from continuous interrupt
processing
If an ordinary instruction (which does not manipulate IE or IP) is executed after returning to
the main routine following execution of the interrupt routine end instruction RETI, and if the
next interrupt conditions have been met during execution of a previous interrupt routine, the
MSM80C154S/MSM83C154S calls the interrupt address in the next cycle following execu-
tion of one main routine instruction. The same occurs when interrupt conditions are satisfied
during execution of the first main routine instruction after returning to the main routine from
the interrupt routine. The time chart is shown in Figure 4-51.