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參數(shù)資料
| 型號： | SAF-C515A-LM |
| 廠商： | SIEMENS A G |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-Bit CMOS Microcontroller |
| 中文描述： | 8-BIT, 18 MHz, MICROCONTROLLER, PQFP80 |
| 文件頁數(shù)： | 38/55頁 |
| 文件大?。?/td> | 268K |
| 代理商： | SAF-C515A-LM |
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C515
Semiconductor Group
38
1997-08-01
Fail Save Mechanisms
As a means of graceful recovery from software or hardware upset a watchdog timer is provided in
the C515. lf the software fails to clear the watchdog timer at least every 65532
μ
s (at 12 MHz clock
rate), an internal hardware reset will be initiated. The software can be designed such that the
watchdog times out if the program does not progress properly. The watchdog will also time out if the
software error was due to hardware-related problems. This prevents the controller from
malfunctioning for longer than 65 ms if a 12-MHz oscillator is used.
Figure 17
shows the block
diagram of the watchdog timer unit.
Figure 17
Block Diagram of the Watchdog Timer
The watchdog timer can be started by software (bit SWDT) but it cannot be stopped during active
mode of the C515. lf the software fails to clear the watchdog in time, an internally generated
watchdog reset is entered at the counter state FFFCH and lasts four instruction cycles. This internal
reset differs from an external reset only to the extent that the watchdog timer is not disabled. Bit
WDTS (was set by starting WDT) allows the software to examine from which source the reset was
initiated. lf it is set, the reset was caused by a watchdog timer overflow.
MCB03210
Control Logic
WDT Reset if WDT count is between
IEN1
IEN0
)
(B8H
H
A8
(
)
16-Bit Watchdog Timer
IP0 (A9H)
WDT
SWDT
-
-
-
-
-
-
-
-
-
-
-
-
-
-
External HW Reset
-
-
-
-
-
-
-
WDTS
OSC
f
÷ 12
Reset
FFFCH
H
FFFF
-
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| SAF-C515C-LM | 8-Bit CMOS Microcontroller |
| SAB-C515-1R24M | 8-Bit CMOS Microcontroller |
| SAB-C515-1RM | 8-Bit CMOS Microcontroller |
| SAB-C515-L24M | 8-Bit CMOS Microcontroller |
| SAB-C515-LM | 8-Bit CMOS Microcontroller |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SAFC515C8EM | 制造商:Infineon Technologies AG 功能描述:8bit microcontrollerSAF-C515C-8EM MQFP80 |
| SAF-C515C-8EM | 制造商:Infineon Technologies AG 功能描述:IC 8BIT MCU OTP SMD 制造商:Infineon Technologies AG 功能描述:IC, 8BIT MCU OTP, SMD |
| SAFC515C-8EM | 制造商:Infineon Technologies AG 功能描述:IC 8BIT CPU SMD MQFP80 515 |
| SAF-C515C-8EM CA | 功能描述:8位微控制器 -MCU 8 BIT OTP 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 安裝風格:SMD/SMT |
| SAFC515C8EM-BC | 制造商:Infineon Technologies AG 功能描述:MCU 8-Bit C500 8051 CISC 64KB EPROM 5V 80-Pin MQFP |
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