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參數(shù)資料
| 型號(hào)： | UPD784054GC-XXX-3B9 |
| 廠商： | NEC Corp. |
| 英文描述： | MICROCONTROLLER|16-BIT|UPD78K4 CPU|CMOS|QFP|80PIN|PLASTIC |
| 中文描述： | 單片機(jī)| 16位| UPD78K4的CPU |的CMOS | QFP封裝| 80腳|塑料 |
| 文件頁(yè)數(shù)： | 36/86頁(yè) |
| 文件大小： | 579K |
| 代理商： | UPD784054GC-XXX-3B9 |
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μ
PD784054(A)
36
7.6 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.
7.7 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 7-9. 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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