參數(shù)資料
型號(hào)： SST89V58RD-33-I-PIE
元件分類(lèi)： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 33 MHz, MICROCONTROLLER, PDIP40
封裝： ROHS COMPLIANT, PLASTIC, MS-011AC, DIP-40
文件頁(yè)數(shù)： 40/81頁(yè)
文件大?。?/td> 935K
代理商： SST89V58RD-33-I-PIE
Data Sheet
FlashFlex51 MCU
SST89E52RD2/RD / SST89E54RD2/RD / SST89E58RD2/RD
SST89V52RD2/RD / SST89V54RD2/RD / SST89V58RD2/RD
45
2006 Silicon Storage Technology, Inc.
S71255-05-000
5/06
7.0 WATCHDOG TIMER
The device offers a programmable Watchdog Timer (WDT)
for fail safe protection against software deadlock and auto-
matic recovery.
To protect the system against software deadlock, the user
software must refresh the WDT within a user-defined time
period. If the software fails to do this periodical refresh, an
internal hardware reset will be initiated if enabled (WDRE=
1). The software can be designed such that the WDT times
out if the program does not work properly.
The WDT in the device uses the system clock (XTAL1) as
its time base. So strictly speaking, it is a watchdog counter
rather than a watchdog timer. The WDT register will incre-
ment every 344,064 crystal clocks. The upper 8-bits of the
time base register (WDTD) are used as the reload register
of the WDT.
The WDTS flag bit is set by WDT overflow and is not
changed by WDT reset. User software can clear WDTS by
writing “1” to it.
Figure 7-1 provides a block diagram of the WDT. Two SFRs
(WDTC and WDTD) control watchdog timer operation.
During idle mode, WDT operation is temporarily sus-
pended, and resumes upon an interrupt exit from idle.
The time-out period of the WDT is calculated as follows:
Period = (255 - WDTD) * 344064 * 1/fCLK (XTAL1)
where WDTD is the value loaded into the WDTD register
and fOSC is the oscillator frequency.
FIGURE
7-1: Block Diagram of Programmable Watchdog Timer
1255 F22.0
WDT Upper Byte
WDT Reset
Internal Reset
344064
clks
Counter
CLK (XTAL1)
Ext. RST
WDTC
WDTD
相關(guān)PDF資料
PDF描述
SST89V54RD-33-I-PIE 8-BIT, FLASH, 33 MHz, MICROCONTROLLER, PDIP40
SST89E54RC-33-C-PIE 8-BIT, FLASH, 33 MHz, MICROCONTROLLER, PDIP40
SST89E54RC-33-C-NJE 8-BIT, FLASH, 33 MHz, MICROCONTROLLER, PQCC44
SST89E52RC-33-C-NJE 8-BIT, FLASH, 33 MHz, MICROCONTROLLER, PQCC44
SST89E52RC-33-C-PIE 8-BIT, FLASH, 33 MHz, MICROCONTROLLER, PDIP40
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SST89V58RDA 制造商:SST 制造商全稱(chēng):Silicon Storage Technology, Inc 功能描述:FlashFlex MCU
SST8H-D 功能描述:電纜束帶 Cable Tie 2-Piece 27.5"L (699mm) Lt RoHS:否 制造商:Phoenix Contact 產(chǎn)品:Cable Tie Mounts 類(lèi)型:Adhesive 顏色:Black 材料:Acrylonitrile Butadiene Styrene (ABS) 長(zhǎng)度:19 mm 寬度:19 mm 抗拉強(qiáng)度:
SST8H-D0 功能描述:電纜束帶 Cable Tie, 2-Piece, 27.5"L (699mm), Ligh RoHS:否 制造商:Phoenix Contact 產(chǎn)品:Cable Tie Mounts 類(lèi)型:Adhesive 顏色:Black 材料:Acrylonitrile Butadiene Styrene (ABS) 長(zhǎng)度:19 mm 寬度:19 mm 抗拉強(qiáng)度:
SST8H-D30 功能描述:電纜束帶 Cable Tie, 2-Piece, 27.5"L (699mm), Ligh RoHS:否 制造商:Phoenix Contact 產(chǎn)品:Cable Tie Mounts 類(lèi)型:Adhesive 顏色:Black 材料:Acrylonitrile Butadiene Styrene (ABS) 長(zhǎng)度:19 mm 寬度:19 mm 抗拉強(qiáng)度:
SST8H-L 功能描述:電纜束帶 Cable Tie 2-Piece 27.5"L (699mm) Lt RoHS:否 制造商:Phoenix Contact 產(chǎn)品:Cable Tie Mounts 類(lèi)型:Adhesive 顏色:Black 材料:Acrylonitrile Butadiene Styrene (ABS) 長(zhǎng)度:19 mm 寬度:19 mm 抗拉強(qiáng)度:
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠(chǎng)商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*