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| HD4074344 Datasheet, PDF (28/100 Pages) Hitachi Semiconductor – 4-bit microcomputers | |||
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HD404344R Series/HD404394 Series
Power on
RESET = 0?
No
Yes
Reset MCU
Interrupt
Yes
request?
No
Execute instruction
No
IE = 1?
Yes
Accept interrupt
PC â (PC) + 1
IE â 0
Stack â (PC)
Stack â (CA)
Stack â (ST)
PC â $0002
PC â $0008
PC â $000A
PC â $000C
Yes
INT0
interrupt?
No
Yes
Timer B
interrupt?
No
Yes
Timer C
interrupt?
No
Yes
A/D
interrupt?
No
PC â $000E
Figure 10 Interrupt Processing Flowchart
(serial interrupt)
28
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