HD4046212RFS datasheet(45/157 Pages) RENESAS

tên linh kiện	HD4046212RFS

Giải thích chi tiết về linh kiện	AS Microcomputer Incorporating a DTMF Generator Circuit

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HD404629R Series

Notes: 2. When the MCU is in watch mode or subactive mode, if the high level period before the falling

edge of

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 24. 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 25, 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.

When the MCU is in watch mode or subactive mode, keep the high level and low level period of

INT

0 longer than interrupt frame.

High

Low

INT

Sampling

Low

Figure 24 Edge Detection

A: Low

B: Low

INT

Interrupt

frame

A: High

B: High

INT

Interrupt

frame

(a) High level period

(b) Low level period

Figure 25 Sampling Example

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