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| HD404459 Datasheet, PDF (22/122 Pages) Renesas Technology Corp – 4-bit HMCS400-series microcomputers | |||
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HD404459 Series
Power on
RESET = 1?
No
Yes
Reset MCU
Interrupt
Yes
request?
No
Execute instruction
No
IE = 1?
Yes
Interrupt accept
PC â (PC) + 1
IE â 0
Stack â (PC)
Stack â (CA)
Stack â (ST)
PC â $0002
PC â $0004
PC â $0006
PC â $0008
PC â $000A
PC â $000C
Yes
INT0
interrupt?
No
Yes
INT1
interrupt?
No
Yes
Timer D
interrupt?
No
Yes Timer-A/INT2
interrupt?
No
Yes Timer-B/INT3
interrupt?
No
Yes Timer-C/serial
interrupt?
No
PC â $000E
(wakeup interrupt)
Figure 10 Interrupt Processing Flowchart
20
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