HD404394 데이터 시트보기 (PDF) - Hitachi -> Renesas Electronics

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HD404394

4-bit microcomputers

Hitachi -> Renesas Electronics 

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 ← (PC) + 1

IE ← 0

Stack ← (PC)

Stack ← (CA)

Stack ← (ST)

PC ← $0002

PC ← $0008

PC ← $000A

PC ← $000C

Yes

INT0

interrupt?

No

Yes

Timer B

interrupt?

No

Yes

Timer C

interrupt?

No

Yes

A/D

interrupt?

No

PC ← $000E

Figure 10 Interrupt Processing Flowchart

(serial interrupt)

28

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