參數(shù)資料
型號(hào)： mPD784031
廠商： NEC Corp.
英文描述： 16/8-BIT SINGLE-CHIP MICROCONTROLLER
中文描述： 16/8-BIT單片機(jī)
文件頁(yè)數(shù)： 40/90頁(yè)
文件大?。?/td> 377K
代理商： MPD784031
μ
PD784031
40
(1) Three-wire serial I/O mode
This mode is designed for communication with a device incorporating a conventional synchronous serial interface.
Basically, three lines are used for communication: the serial clock line (SCK0) and serial data lines (SI0 and SO0).
In general, a handshake line is required to check the state of communication.
(2) Two-wire serial I/O mode
In this mode, 8-bit data is transferred using two lines: the serial clock line (SCL) and serial data bus (SDA).
In general, a handshake line is required to check the communication state.
8.9 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.
Note
INTP0 is used for sampling clock selection.
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
8.10 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 8-13. Block Diagram of Watchdog Timer
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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