- 您现在的位置：买卖IC网 > PDF目录69331 > SAF-C515-LN (INFINEON TECHNOLOGIES AG) 8-BIT, 16 MHz, MICROCONTROLLER, PQCC68 PDF资料下载
参数资料
| 型号： | SAF-C515-LN |
| 厂商： | INFINEON TECHNOLOGIES AG |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, 16 MHz, MICROCONTROLLER, PQCC68 |
| 封装： | PLASTIC, LCC-68 |
| 文件页数： | 34/162页 |
| 文件大小： | 771K |
| 代理商： | SAF-C515-LN |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页当前第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页第91页第92页第93页第94页第95页第96页第97页第98页第99页第100页第101页第102页第103页第104页第105页第106页第107页第108页第109页第110页第111页第112页第113页第114页第115页第116页第117页第118页第119页第120页第121页第122页第123页第124页第125页第126页第127页第128页第129页第130页第131页第132页第133页第134页第135页第136页第137页第138页第139页第140页第141页第142页第143页第144页第145页第146页第147页第148页第149页第150页第151页第152页第153页第154页第155页第156页第157页第158页第159页第160页第161页第162页
Semiconductor Group
8-1
Fail Safe Mechanisms
C515
8
Fail Safe Mechanisms
8.1
Watchdog Timer
8.1.1 General Operation
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
ms (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.
The watchdog timer is a 16-bit counter which is incremented once every machine cycle. After an
external reset the watchdog timer is disabled and cleared to 0000H.
8.1.2 Starting the Watchdog Timer
There are two ways to start the watchdog timer depending on the level applied to pin PE/SWD. This
pin serves two functions, because it is also used for blocking the power saving modes. (see also
chapter 9).
8.1.2.1
The First Possibility of Starting the Watchdog Timer
The automatic start of the watchdog timer directly during an external HW reset is achieved by
strapping pin PE/SWD to
V
CC. In this case the power saving modes (power down mode, idle mode
and slow down mode) are also disabled and cannot be started by software. If pin PE/SWD is left
unconnected, a weak pull-up transistor ensures the automatic start of the watchdog timer.
The self-start of the watchdog timer by a pin option has been implemented to provide high system
security in electrically very noisy environments.
Note: The automatic start of the watchdog timer is only performed if PE/SWD (power-save
enable
/start watchdog timer) is held at high level while RESET is active. A positive transition
at PE/SWD pin during normal program execution will not start the watchdog timer.
8.1.2.2
The Second Possibility of Starting the Watchdog Timer
The watchdog timer can also be started by software. Setting of bit SWDT in SFR IEN1 starts the
watchdog timer. After having been started, the bit WDTS in SFR IP0 is set. Note that the watchdog
timer cannot be stopped by software.
See chapter 9 for entering the power saving modes by software.
相关PDF资料 |
PDF描述 |
|---|---|
| SAH-C515-LN | 8-BIT, 16 MHz, MICROCONTROLLER, PQCC68 |
| SAB-C515-LM | 8-BIT, 16 MHz, MICROCONTROLLER, PQFP80 |
| SAB-C515C-LM | 8-BIT, 10 MHz, MICROCONTROLLER, PQFP80 |
| SAB-XC164CM-8F40F | 16-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP64 |
| SAB-XC164CM-4F40F | 16-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP64 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SAF-C517A | 制造商:INFINEON 制造商全称:Infineon Technologies AG 功能描述:8-bit CMOS MICROCONTROLLER |
| SAF-C517A-4R24M | 制造商:INFINEON 制造商全称:Infineon Technologies AG 功能描述:8-Bit CMOS Microcontroller |
| SAF-C517A-4RM | 制造商:INFINEON 制造商全称:Infineon Technologies AG 功能描述:8-Bit CMOS Microcontroller |
| SAF-C517A-L | 制造商:INFINEON 制造商全称:Infineon Technologies AG 功能描述:8 BIT CMOS MICROCONTROLLER |
| SAF-C517A-LM | 制造商:INFINEON 制造商全称:Infineon Technologies AG 功能描述:8-Bit CMOS Microcontroller |
发布紧急采购，3分钟左右您将得到回复。