HD404324 데이터 시트보기 (PDF) - Renesas Electronics

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HD404324

4-bit HMCS400-series microcomputer

Renesas Electronics 

HD404328 Series

Interrupt

strobe

STOP/SBY

execution

Subactive mode

Internal execution

time

(LSON = 0, DTON = 1)

Oscillation

stabilization

time

Direct transfer

timing

T

t RC

Active mode

T: Interrupt frame length

tRC: Oscillation stabilization period

Figure 15 Direct Transfer Timing

MCU Operation Sequence: The MCU operates in the sequence shown in figures 16 to 18. It is reset by

an asynchronous RESET input, regardless of its state.

The low-power mode operation sequence is shown in figure 18. 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

No

RESET = 1?

Yes

Reset MCU

MCU operation

cycle

Figure 16 MCU Operating Sequence (Power On)

33

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