參數(shù)資料
型號(hào)： M34280M1-XXXFP
元件分類： 微控制器/微處理器
英文描述： 4-BIT, MROM, 4 MHz, MICROCONTROLLER, PDSO20
封裝： 0.300 INCH, 1.27 MM PITCH, PLASTIC, SOP-20
文件頁數(shù)： 8/48頁
文件大小： 605K
代理商： M34280M1-XXXFP
13
MITSUBISHI MICROCOMPUTERS
4280 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for INFRARED REMOTE CONTROL TRANSMITTERS
WATCHDOG TIMER
Watchdog timer provides a method to reset and restart the system
when a program runs wild. Watchdog timer consists of 14-bit
timer (WDT) and watchdog timer flags (WDF1, WDF2).
Watchdog timer downcounts the instruction clock (INSTCK) as
the count source. When the timer WDT count value becomes
000016 and underflow occurs, the WDF1 flag is set to “1.” Then,
when the WRST instruction is not executed before the timer WDT
counts 16383, WDF2 flag is set to “1” and internal reset signal is
generated and system reset is performed.
When using the watchdog timer, execute the WRST instruction
at period of 16383 machine cycle or less to keep the
microcomputer operation normal.
Timer WDT is also used for generation of oscillation stabilization
time. When system is returned from reset and from RAM back-
up mode by key-input, software starts after the stabilization
oscillation time until timer WDT downcounts to 3E0016 elapses.
Fig. 14 Watchdog timer function
3E0016
0000 16
3FFF16
Value of timer WDT
WDF1 flag
WDF2 flag
Internal reset signal
“1”
“0”
“1”
“0”
“H”
“L”
System reset
Return
POF
instruction
execution
WRST
instruction
execution
System reset
Software
start
Software
start
Software
start
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M34280M1-XXXGP 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for INFRARED REMOTE CONTROL TRANSMITTERS
M3428-100 制造商:MANHATTEN 功能描述:24AWG COMPUTER CABLE
M34282 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
M34282E2 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
M34282E2GP 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
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