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參數(shù)資料
| 型號(hào)： | μPD784044 |
| 廠商： | NEC Corp. |
| 英文描述： | 16 Bit Single Chip Microcontrollers(16位單片微控制器) |
| 中文描述： | 16位單片機(jī)微控制器（16位單片微控制器） |
| 文件頁(yè)數(shù)： | 38/62頁(yè) |
| 文件大?。?/td> | 366K |
| 代理商： | ΜPD784044 |
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PD784044,
784046
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7.7 Edge Detection Circuit
The interrupt input pins (NMI and INTP0 through INTP6) input not only interrupt requests but also trigger
signals of the internal hardware. Because all the interrupts and internal hardware operate by detecting specific
edges of the input signals, a function to detect edges is provided. In addition, a noise rejection function is also
provided to prevent detection of a wrong edge due to noise.
Pin
Detectable Edge
Noise Rejected by:
NMI
Either rising or falling edge
Analog delay
INTP0-INTP6
Either rising or falling edge, or both edges
Clock sampling
Note
Note
A sampling clock can be selected.
7.8 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 the watchdog timer has been
enable to operate, its operation cannot be stopped by software. Moreover, it can be specified whether the
interrupt by the watchdog timer or the interrupt from the NMI pin takes precedence.
Figure 7-10. Block Diagram of Watchdog Timer
Watchdog timer (8 bits)
Overflow
WDT CLR
f
CLK
INTWDT
f
CLK
/2
9
f
CLK
/2
11
f
CLK
/2
12
f
CLK
/2
13
Divider
S
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