Product data

HD404818 Series
22
Power
on
RESET = 1 ?
Reset MCU
Interrupt
request ?
Execute instruction
PC (PC) + 1
←
PC $0002
←
PC $0004
←
PC $0006
←
PC $0008
←
PC $000A
←
PC $000C
←
IE = 1?
Accept interrupt
IE 0
Stack (PC)
Stack (CA)
Stack (ST)
←
INT
interrupt ?
0
INT
interrupt ?
1
Timer A
interrupt ?
Timer B
interrupt ?
Timer C
interrupt ?
No
Yes
No
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
←
←
←
(serial interrupt)
Figure 8 Interrupt Processing Flowchart