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參數(shù)資料
| 型號(hào)： | μPD784038Y |
| 廠商： | NEC Corp. |
| 英文描述： | 8/16 Bit Single Chip Microcontrollers(8/16 位微控制器) |
| 中文描述： | 8 / 16位單片機(jī)微控制器（8 / 16位微控制器） |
| 文件頁(yè)數(shù)： | 44/70頁(yè) |
| 文件大小： | 464K |
| 代理商： | ΜPD784038Y |
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PD784035Y,784036Y,784037Y,784038Y
44
7.10 Edge Detection Function
The interrupt input pins (NMI and INTP0 through INTP5) are used not only to input interrupt requests but also
to input trigger signals to the internal hardware units. Because these pins operate at an edge of the input signal,
they have a function to detect an edge. Moreover, a noise reduction circuit is also provided to prevent erroneous
detection due to noise.
Pin Name
Detectable Edge
Noise Reduction
NMI
Either of rising or falling edge
By analog delay
INTP0-INTP3
Either or both of rising and falling edges
By clock sampling
Note
INTP4, INTP5
By analog delay
Note
INTP0 can select a sampling clock.
7.11 Watchdog Timer
A watchdog timer is provided to detect a hang up of the CPU. This watchdog timer generates a non-maskable
interrupt unless it is cleared by software within a specified interval time. Once enabled to operate, the watchdog
timer cannot be stopped by software. Whether the interrupt by the watchdog timer or the interrupt input from the
NMI pin takes precedence can be specified.
Figure 7-14. Block Diagram of Watchdog Timer
S
f
CLK
/2
21
f
CLK
/2
20
f
CLK
/2
19
f
CLK
/2
17
f
CLK
Clear signal
Timer
INTWDT
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