參數(shù)資料
型號(hào)： μPD784036(A)
廠(chǎng)商： NEC Corp.
英文描述： 8/16 Bit Single Chip Microcontrollers(8/16 位單片微控制器)
中文描述： 8 / 16位單片機(jī)微控制器（8 / 16位單片微控制器）
文件頁(yè)數(shù)： 42/90頁(yè)
文件大?。?/td> 402K
代理商： ΜPD784036(A)
μ
PD784035(A), 784036(A)
42
7.10 Edge Detection Function
The interrupt input pins (NMI, INTP0-INTP5) are used to apply not only interrupt requests but also trigger signals
for the built-in circuits. As these pins are triggered by an edge (rising or falling) of an input signal, a function for edge
detection is incorporated. Moreover, a noise suppression function is provided to prevent erroneous edge detection
caused by noise.
Table 7-3. Noise Suppression Method for Interrupt Input Pins
Note
INTP0 is used for sampling clock selection.
7.11 Watchdog Timer
A watchdog timer is incorporated for CPU runaway detection. The watchdog timer, if not cleared by software within
a specified interval, generates a nonmaskable interrupt. Furthermore, once watchdog timer operation is enabled, it
cannot be disabled by software. The user can specify whether priority is placed on an interrupt based on the watchdog
timer or on an interrupt based on the NMI pin.
Figure 7-14. Block Diagram of Watchdog Timer
Pin
Detectable edge
Noise suppression method
NMI
Rising edge or falling edge
Analog delay
INTP0-INTP3
Rising edge or falling edge, or both edges
Clock sampling
Note
INTP4, INTP5
Analog delay
f
CLK
/2
21
f
CLK
INTWDT
f
CLK
/2
20
f
CLK
/2
19
f
CLK
/2
17
Timer
Clear signal
S
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