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參數(shù)資料
| 型號： | SAF-C868-1RR |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 40 MHz, MICROCONTROLLER, PDSO38 |
| 封裝： | PLASTIC, TSSOP-38 |
| 文件頁數(shù)： | 49/70頁 |
| 文件大?。?/td> | 1067K |
| 代理商： | SAF-C868-1RR |
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C868
Data Sheet
53
V 0.2, 2002-01
Fail Save Mechanisms
The C868 offers enhanced fail save mechanisms, which allow an automatic recovery
from software upset or hardware failure :
a programmable watchdog timer (WDT), with variable time-out period from 12.8
s to
819.2
s at f
SYS = 40 MHz.
Programmable Watchdog Timer
To protect the system against software failure, the user’s program has to clear this
watchdog within a previously programmed time period. lf the software fails to do this
periodical refresh of the watchdog timer, an internal reset will be initiated. The software
can be designed so that the watchdog times out if the program does not work properly.
lt also times out if a software error is based on hardware-related problems.
The watchdog timer in the C868 is a 16-bit timer, which is incremented by a count rate
of f
SYS/2 upto fSYS/128. The machine clock of the C868 is divided by a prescaler, a divide-
by-two or a divide-by-128 prescaler. The upper 8 bits of the Watchdog Timer can be
preset to a user-programmable value via a watchdog service access in order to vary the
watchdog expire time. The lower 8 bits are reset on each service access. Figure 21
shows the block diagram of the watchdog timer unit.
Figure 21
Block Diagram of the Programmable Watchdog Timer
After a reset, the Watchdog Timer is automatically enabled. If it is disabled, it cannot be
enabled again during active mode of the device.
If the software fails to clear the
watchdog timer an internal reset will be initiated. The reset cause (external reset or reset
caused by the watchdog) can be examined by software (status flag WDTR in SCUWDT
is set). A refresh of the watchdog timer is done by setting bits WDTRE and WDTRS (in
WDT High Byte
WDTRST
WDTREL
DISWDT
WDTIN
MUX
1:2
WDT Low Byte
WDT
Control
Clear
1:128
f
SYS
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| SAF-C868-1SR | 8-BIT, 40 MHz, MICROCONTROLLER, PDSO38 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SAFC8681SG | 制造商:Infineon Technologies AG 功能描述: |
| SAF-C868-1SG-ESAB | 制造商:Infineon Technologies AG 功能描述: |
| SAFC8681SR | 制造商:Infineon Technologies AG 功能描述: |
| SAF-C868-1SR BA | 功能描述:IC MCU 8BIT ROM/LESS TSSOP-38-1 RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:C5xx/C8xx 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:260 系列:73S12xx 核心處理器:80515 芯體尺寸:8-位 速度:24MHz 連通性:I²C，智能卡，UART/USART，USB 外圍設(shè)備:LED，POR，WDT 輸入/輸出數(shù):9 程序存儲器容量:64KB（64K x 8） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:2K x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:68-VFQFN 裸露焊盤 包裝:管件 |
| SAF-C868-1SRBA | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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