HD404314H データシートの表示（PDF） - Hitachi -> Renesas Electronics

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HD404314H

4-bit HMCS400-series microcomputer

Hitachi -> Renesas Electronics 

HD404318 Series

MCU Operation Sequence: The MCU operates in the sequence shown in figure 13 and figure 14.

The low-power mode operation sequence is shown in figure 14. With the IE flag cleared and an interrupt

flag set together with its interrupt mask cleared, if a STOP/SBY instruction is executed, the instruction is

cancelled (regarded as an NOP) and the following instruction is executed. Before executing a STOP/SBY

instruction, make sure all interrupt flags are cleared or all interrupts are masked.

Power ON

RESET = 0? No

Yes

RAME = 0

Reset MCU

Reset input

MCU operation cycle

IF = 1?

No

Yes

No

IRnAstMruEct=io1n

execution

IM = 0

IE = 1

Yes

Low-power mode

operation cycle

(figure 15)

SBY/STOP

instruction

No

PC ← (PC)+1

IE ← 0

Stack ← (PC),

(CA), (ST)

PC ← vector

address

Figure 13 MCU Operating Sequence (Power ON)

20

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