參數(shù)資料
型號: HCD404084
廠商: Hitachi,Ltd.
英文描述: Low-Voltage AS Microcomputers with On-Chip A/D Converter(帶片上A/D轉(zhuǎn)換器的低壓微計算機)
中文描述: 低電壓如同在微機芯片的A / D轉(zhuǎn)換器(帶片上的A / D轉(zhuǎn)換器的低壓微計算機)
文件頁數(shù): 54/162頁
文件大?。?/td> 482K
代理商: HCD404084
HD404374/HD404384/HD404389/HD404082/HD404084 Series
54
Usage notes (Applies to HD404374 Series):
In watch mode and subactive mode, an interrupt will not be detected correctly if the
INT
0
or
WU
0
high or
low-level period is shorter than the interrupt frame period.
The MCU’s edge sensing method is shown in figure 18. The MCU samples the
I NT
0
and
WU
0
signals at
regular intervals, and if consecutive sampled values change from high to low, it determines that a falling
edge has been generated.
Interrupt detection errors occur since this sampling is performed at the interrupt frame period. If the high-
level period of the
INT
0
or
WU
0
signal is within an interrupt frame, as shown in figure 19 (a), the signal
will be low at point A and point B, with the result that the falling edge will not be recognized. Similarly, If
the low-level period of the
INT
0
or
WU
0
signal is within an interrupt frame, as shown in figure 19 (b), the
signal will be high at point A and point B, with the result that the falling edge will not be recognized.
In watch mode and subactive mode, therefore, ensure that the high-level and low-level periods of the
INT
0
and
WU
0
signals is at least as long as the interrupt frame period.
INT
0
or
WU
0
Sampling
High
Low
Low
Figure 18 Edge Sensing Method
INT
0
or
WU
0
Interrupt frame
Point A: Low
Point B: Low
INT
0
or
WU
0
Interrupt frame
Point A: High
Point B: High
(a) High-level mode
(b) Low-level mode
Figure 19 Sampling Examples
相關(guān)PDF資料
PDF描述
HCD40C4084 Low-Voltage AS Microcomputers with On-Chip A/D Converter(帶片上A/D轉(zhuǎn)換器的低壓微計算機)
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