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參數(shù)資料
| 型號： | SAK-C505L |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-bit CMOS Microcontroller |
| 中文描述： | 8位CMOS微控制器 |
| 文件頁數(shù)： | 49/85頁 |
| 文件大?。?/td> | 487K |
| 代理商： | SAK-C505L |
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C505L
Data Sheet
47
06.99
Fail Save Mechanisms
The C505L offers enhanced fail safe mechanisms, which allow an automatic recovery from software
upset or hardware failure:
– a programmable watchdog timer (WDT), with variable time-out period from 192
μ
s up to
approx. 393.2 ms at 16 MHz (314.5 ms at 20 MHz).
– an oscillator watchdog (OWD) which monitors the on-chip oscillator and forces the
microcontroller into reset state in case the on-chip oscillator fails; it also provides the clock for
a fast internal reset after power-on.
The watchdog timer in the C505L is a 15-bit timer, which is incremented by a count rate of
f
OSC
/12
up to
f
OSC
/192. The system clock of the C505L is divided by two prescalers, a divide-by-two and a
divide-by-16 prescaler. For programming of the watchdog timer overflow rate, the upper 7 bits of the
watchdog timer can be written.
Figure 24
shows the block diagram of the watchdog timer unit.
Figure 24
Block Diagram of the Watchdog Timer
The watchdog timer can be started by software (bit SWDT in SFR IEN1) but it cannot be stopped
during active mode of the device. If the software fails to refresh the running watchdog timer an
internal reset will be initiated on watchdog timer overflow. For refreshing of the watchdog timer the
content of the SFR WDTREL is transferred to the upper 7-bit of the watchdog timer. The refresh
sequence consists of two consecutive instructions which set the bits WDT and SWDT each. The
reset cause (external reset or reset caused by the watchdog) can be examined by software (flag
WDTS). It must be noted, however, that the watchdog timer is halted during the idle mode and
power down mode of the processor.
MCB03306
IP0 (A9 )
OSC
f
WDTS
2
16
14
0
7
8
WDTL
WDTH
/ 6
External HW Reset
Control Logic
IEN0 (A8 )
IEN1 (B8 )
6
7
0
WDT Reset - Request
WDTPSEL
WDTREL (86 )
WDT
SWDT
OWDS
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