參數(shù)資料
型號: HD404618FS
廠商: Hitachi,Ltd.
英文描述: 4-Bit Single-Chip Microcomputer
中文描述: 4位單片機
文件頁數(shù): 34/89頁
文件大?。?/td> 358K
代理商: HD404618FS
HD404618 Series
34
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,
INT
0
is not detected. Also, if the low level period after the
falling edge of
INT
0
is shorter than the interrupt frame,
INT
0
is not detected.
Edge detection is shown in figure 19. 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 20, 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
0
Low
Figure 19 Edge Detection
A: Low
B: Low
INT
Interrupt
frame
0
A: High
B: High
INT
Interrupt
frame
0
(a) High level period
(b) Low level period
Figure 20 Sampling Example
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