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參數(shù)資料
| 型號： | SST89E52RD-40-C-PI |
| 廠商： | SILICON STORAGE TECHNOLOGY INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PDIP40 |
| 封裝： | PLASTIC, MS-011AC, DIP-40 |
| 文件頁數(shù)： | 40/81頁 |
| 文件大小： | 935K |
| 代理商： | SST89E52RD-40-C-PI |
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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
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| SST89V58RD-33-C-PI | 8-BIT, FLASH, 33 MHz, MICROCONTROLLER, PDIP40 |
| SST89V58RD-33-I-PIE | 8-BIT, FLASH, 33 MHz, MICROCONTROLLER, PDIP40 |
| 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 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SST89E52RD-40-C-PIE | 功能描述:8位微控制器 -MCU 16KB+1KB 40MHz RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| SST89E52RD-40-I-PI | 制造商:SST 制造商全稱:Silicon Storage Technology, Inc 功能描述:FlashFlex51 MCU |
| SST89E52RD-40-I-PIE | 制造商:SST 制造商全稱:Silicon Storage Technology, Inc 功能描述:FlashFlex51 MCU |
| SST89E54RC | 制造商:SST 制造商全稱:Silicon Storage Technology, Inc 功能描述:FlashFlex MCU |
| SST89E54RC-33-C-NJE | 功能描述:8位微控制器 -MCU 8-Bit 16K+1K Flash 33MHz 3/16-Bit Timer RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
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