HD404448 datasheet(39/125 Pages) RENESAS

39 / 125 page

HD404449 Series

Low-power mode

operation cycle

IF = 1 and

IM = 0?

Hardware NOP

execution

←

Iocation

MCU operation

cycle

Standby/Watch

mode

IF = 1 and

IM = 0?

Hardware NOP

execution

Iocation

←

Instruction

execution

Stop mode

Yes

Note:

* For IF and IM operation, refer to figure 15.

STOPC = 0?

RAME = 1

Reset MCU

Yes

Figure 22 MCU Operating Sequence (Low-Power Mode Operation)

Note:

When the MCU is in watch mode or subactive mode, if the high level period before the falling edge

INT

0 is shorter than the interrupt frame, INT0 is not detected.

Also, if the low level period after

the falling edge of

INT

0 is shorter than the interrupt frame, INT0 is not detected.

Edge detection is shown in figure 23. The level of the

INT

0 signal is sampled by a sampling clock.

When this sampled value changes to low from high, a falling edge is detected.

In figure 24, the level of the

INT

0 signal is sampled by an interrupt frame. In (a) the sampled value

is low at point A, and also low at point B. Therefore, a falling edge is not detected. In (b), the

sampled value is high at point A, and also high at point B. A falling edge is not detected in this

case either.

HD404448 Datasheet(PDF) 39 Page - Renesas Technology Corp

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