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參數(shù)資料
| 型號： | M37534E4GP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PQFP32 |
| 封裝： | 7 X 7 MM, 0.80 MM PITCH, PLASTIC, LQFP-32 |
| 文件頁數(shù)： | 27/53頁 |
| 文件大?。?/td> | 680K |
| 代理商： | M37534E4GP |
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SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
7534 Group
MITSUBISHI MICROCOMPUTERS
33
Watchdog Timer
The watchdog timer gives a means for returning to a reset status
when the program fails to run on its normal loop due to a runaway.
The watchdog timer consists of an 8-bit watchdog timer H and an 8-
bit watchdog timer L, being a 16-bit counter.
Standard operation of watchdog timer
The watchdog timer stops when the watchdog timer control register
(address 003916) is not set after reset. Writing an optional value to
the watchdog timer control register (address 003916) causes the
watchdog timer to start to count down. When the watchdog timer H
underflows, an internal reset occurs. Accordingly, it is programmed
that the watchdog timer control register (address 003916) can be set
before an underflow occurs.
When the watchdog timer control register (address 003916) is read,
the values of the high-order 6-bit of the watchdog timer H, STP in-
struction disable bit and watchdog timer H count source selection bit
are read.
Initial value of watchdog timer
By a reset or writing to the watchdog timer control register (address
003916), the watchdog timer H is set to “FF16” and the watchdog
timer L is set to “FF16”.
Operation of watchdog timer H count source selection bit
A watchdog timer H count source can be selected by bit 7 of the
watchdog timer control register (address 003916). When this bit is
“0”, the count source becomes a watchdog timer L underflow signal.
The detection time is 174.763 ms at f(XIN)=6 MHz.
When this bit is “1”, the count source becomes f(XIN)/16. In this
case, the detection time is 683
s at f(XIN)=6 MHz.
This bit is cleared to “0” after reset.
Operation of STP instruction disable bit
When the watchdog timer is in operation, the STP instruction can be
disabled by bit 6 of the watchdog timer control register (address
003916).
When this bit is “0”, the STP instruction is enabled.
When this bit is “1”, the STP instruction is disabled, and an internal
reset occurs if the STP instruction is executed.
Once this bit is set to “1”, it cannot be changed to “0” by program.
This bit is cleared to “0” after reset.
Fig. 38 Block diagram of watchdog timer
Fig. 39 Structure of watchdog timer control register
XIN
Data bus
“0”
“1”
1/16
Watchdog timer H count
source selection bit
Reset
circuit
STP Instruction Disable Bit
Watchdog timer H (8)
Write “FF16” to the
watchdog timer
control register
Internal reset
RESET
Watchdog timer L (8)
STP Instruction
Write “FF16” to the
watchdog timer
control register
Watchdog timer control register(address 0039 16)
WDTCON
Watchdog timer H (read-only for high-order 6-bit)
STP instruction disable bit
0 : STP instruction enabled
1 : STP instruction disabled
Watchdog timer H count source selection bit
0 : Watchdog timer L underflow
1 : f(XIN)/16
b7
b0
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相關(guān)代理商/技術(shù)參數(shù) |
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| M37534E4GP#U1 | 功能描述:MCU 4/5V 8K PB-FREE 32-LQFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:740/38000 產(chǎn)品培訓(xùn)模塊:CAN Basics Part-1 CAN Basics Part-2 Electromagnetic Noise Reduction Techniques Part 1 M16C Product Overview Part 1 M16C Product Overview Part 2 標(biāo)準(zhǔn)包裝:1 系列:M16C™ M32C/80/87 核心處理器:M32C/80 芯體尺寸:16/32-位 速度:32MHz 連通性:EBI/EMI，I²C，IEBus，IrDA，SIO，UART/USART 外圍設(shè)備:DMA，POR，PWM，WDT 輸入/輸出數(shù):121 程序存儲(chǔ)器容量:384KB（384K x 8） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:- RAM 容量:24K x 8 電壓 - 電源 (Vcc/Vdd):3 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 34x10b，D/A 2x8b 振蕩器型:內(nèi)部 工作溫度:-20°C ~ 85°C 封裝/外殼:144-LQFP 包裝:托盤 產(chǎn)品目錄頁面:749 (CN2011-ZH PDF) 配用:R0K330879S001BE-ND - KIT DEV RSK M32C/87 |
| M37534E8FP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37534E8SP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37534M4 | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37534M4-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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