HD404054 Datasheet, PDF (19/101 Pages) Hitachi Semiconductor – HMCS400-series microcomputers designed to increase program productivity with large-capacity memory

Power on
RESET = 0?
No
Yes
Reset MCU
HD404054 Series/HD404094 Series
Interrupt
Yes
request?
No
Execute instruction
No
IE = 1?
Yes
Accept interrupt
PC ^←(PC) + 1
IE ← 0
Stack ← (PC)
Stack ^← (CA)
Stack ^← (ST)
PC^← $0002
PC^← $0004
PC^← $0006
PC^← $000A
PC^←$000C
PC^← $000E
Yes
INT₀
interrupt?
No
Yes
INT₁
interrupt?
No
Yes
Timer-A
interrupt?
No
Yes
Timer-C
interrupt?
No
Yes
Timer-D
interrupt?
No
(serial 1 interrupt)
Figure 10 Interrupt Processing Flowchart
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