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参数资料
| 型号： | SAF-C868A-1SGBA |
| 厂商： | INFINEON TECHNOLOGIES AG |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, 40 MHz, MICROCONTROLLER, PDSO28 |
| 封装： | PLASTIC, SO-28 |
| 文件页数： | 60/82页 |
| 文件大小： | 1252K |
| 代理商： | SAF-C868A-1SGBA |
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C868
Data Sheet
63
V 1.0, 2003-05
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 29
shows the block diagram of the watchdog timer unit.
Figure 29
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
相关PDF资料 |
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| SAF-C868P-1SGBA | 8-BIT, 40 MHz, MICROCONTROLLER, PDSO28 |
| SAK-C868A-1SGBA | 8-BIT, 40 MHz, MICROCONTROLLER, PDSO28 |
| SAK-C868-1RRBA | 8-BIT, MROM, 40 MHz, MICROCONTROLLER, PDSO38 |
| SAF-TC1130-L150EB-GBB | 32-BIT, FLASH, 150 MHz, MICROCONTROLLER, PBGA208 |
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