參數(shù)資料
型號: HD40L4816
廠商: Hitachi,Ltd.
英文描述: 4-Bit Single-Chip Microcomputer(4位單片微計算機)
中文描述: 4位單片機(4位單片微計算機)
文件頁數(shù): 36/98頁
文件大?。?/td> 621K
代理商: HD40L4816
HD404818 Series
36
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 be detected. Also, if the low level period after the
falling edge of
INT
0
is shorter than the interrupt frame,
INT
0
is not be detected.
Edge detection is shown in figure 18. 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 19, 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 the interrupt frame.
High
Low
INT
Sampling
0
Low
Figure 18 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 19 Sampling Example
相關PDF資料
PDF描述
HD40L4818 4-Bit Single-Chip Microcomputer(4位單片微計算機)
HD404816 4-Bit Single-Chip Microcomputer(4位單片微計算機)
HD404814FS 16-digit LCD driver
HD4074899 16-digit LCD driver
HD404814H 16-digit LCD driver
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