HD404669 Datasheet, PDF (26/142 Pages) Hitachi Semiconductor – Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit

HD404669 Series
Power on
No
RESET = "1"?
Yes
MCU reset
Yes
Interrupt request?
No
Execute instruction
No
IE = 1?
Yes
Accept interrupt
PC (PC)+1
IE
Stack
Stack
Stack
0
(PC)
(CA)
(ST)
PC $0002
PC $0004
PC $0006
PC $0008
PC $000A
PC $000C
PC $000E
Yes
INT₀ interrupt?
No
Yes
INT₁ interrupt?
No
Yes
Timer A interrupt?
No
Yes
INT₂ interrupt?
No
Yes
Timer C or INT₃
interrupt?
No
Yes
Timer D or INT₄
interrupt?
No
(Serial 1 interrupt)
Figure 11 Interrupt Processing Flowchart
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