HD404364 查看數據表（PDF） - Renesas Electronics

零件编号

产品描述 (功能)

生产厂家

HD404364

4-bit HMCS400-Series microcomputer

Renesas Electronics 

HD404369 Series

Low-power mode

operation cycle

IF = 1 and

No

IM = 0?

Yes

Standby/watch

mode

Stop mode

Hardware NOP

execution

No

IF = 1 and

IM = 0?

Yes

Hardware NOP

execution

No

STOPC = 0?

Yes

RAME = 1

PC ← Next

Iocation

PC ← Next

Iocation

Instruction

execution

Reset MCU

MCU operation

cycle

For IF and IM operation, refer to figure 12.

Figure 19 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

of INT0 is shorter than the interrupt frame, INT0 is not detected. Also, if the low level period after

the falling edge of INT0 is shorter than the interrupt frame, INT0 is not detected. Edge detection is

shown in figure 20. The level of the INT0 signal is sampled by a sampling clock. When this

sampled value changes to low from high, a falling edge is detected. In figure 21, the level of the

INT0 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. When the MCU is in

watch mode or subactive mode, keep the high level and low level period of INT0 longer than the

interrupt frame

36

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