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參數(shù)資料
| 型號(hào)： | M37630E4T-XXXFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 10 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | 0.80 MM PITCH, PLASTIC, QFP-44 |
| 文件頁數(shù)： | 31/48頁 |
| 文件大?。?/td> | 563K |
| 代理商： | M37630E4T-XXXFP |
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MITSUBISHI MICROCOMPUTERS
7630 Group
37
MITSUBISHI
ELECTRIC
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
WATCHDOG TIMER
The watchdog timer consists of two separate counters: one 7-bit
counter (WDH) and one 4-bit counter (WDL). Cascading both
counters or using the high-order counter allows only to select the
time-out from either 524288 or 32768 cycles of the internal clock
φ.
Refer to Fig. 41 and Fig. 42. Both counters are addressed by the
same watchdog timer register (WDT). When writing to this register,
both counters will be set to the following default values:
the high-order counter will be set to address 7F16
the low-order counter will be set to address F16
regardless of the data written to the WDT register. Reading the
watchdog timer register will return the corresponding control bit sta-
tus, not the counter contents.
Once the WDT register is written to, the watchdog timer starts
counting down and the watchdog timer interrupt is enabled. Once it
is running, the watchdog timer cannot be disabled or stopped
except by reset. On a watchdog timer underflow, a non-maskable
watchdog timer interrupt will be requested.
To prevent the system being stopped by STP instruction, this
instruction can be disabled by the STP instruction disable bit of
WDT register. Once the STP instruction is disabled, it cannot be
enabled again except by RESET.
Fig. 41
Block diagram of watchdog timer
Fig. 42
Structure of watchdog timer register (
φ is internal clock system)
1/256
φ
WDT interrupt
WDL counter (4)
WDH counter (7)
WDT7
“F16”“7F16”
WDT register (8)
“0”
“1”
Not used (undefined when read)
Stop instruction disable bit
0 : Stop instruction enabled
1 : Execute two NOP instructions instead (once this bit is set to
“1” it can not be cleared to “0” again, except on RESET.)
Upper byte count source selection bit
0 : Underflow of the low order counter
1 :
φ divided by 256
70
Watchdog timer register (address 002E16)
WDT
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M37630E4FP | 8-BIT, OTPROM, 10 MHz, MICROCONTROLLER, PQFP44 |
| M37640E8FP | 8-BIT, OTPROM, 24 MHz, MICROCONTROLLER, PQFP80 |
| M37640E8FS | 8-BIT, OTPROM, 24 MHz, MICROCONTROLLER, PQFP80 |
| M37640M8-XXXFP | 8-BIT, MROM, 24 MHz, MICROCONTROLLER, PQFP80 |
| M37640E8FP | 8-BIT, OTPROM, 24 MHz, MICROCONTROLLER, PQFP80 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M37630E4T-XXXFS | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37630M4T | 制造商:CMLMICRO 制造商全稱:CML Microcircuits 功能描述:Baseband Processor for ‘Leisure’ Radios with Data |
| M37630M4T-XXXFP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37630M4T-XXXFS | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37630T-RFS | 功能描述:BOARD CONV FOR M37630 EMULATOR RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 配件 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program RoHS指令信息:IButton RoHS Compliance Plan 標(biāo)準(zhǔn)包裝:1 系列:- 附件類型:USB 至 1-Wire? RJ11 適配器 適用于相關(guān)產(chǎn)品:1-Wire? 設(shè)備 產(chǎn)品目錄頁面:1429 (CN2011-ZH PDF) |
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