HD404848 查看數據表（PDF） - Hitachi -> Renesas Electronics

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产品描述 (功能)

生产厂家

HD404848

4-Bit Single-Chip Microcomputer

Hitachi -> Renesas Electronics 

Low-power mode

operation cycle

HD404849 Series

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 15.

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

Notes on Use:

• 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 will not be detected. Also, if the low level period after the

falling edge of INT0 is shorter than the interrupt frame, INT0 will not be detected.

Edge detection is shown in figure 23. The level of the INT0 signal is sampled by a sampling clock.

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

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