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型號(hào)：	E5550F-S8
廠商：	TEMIC SEMICONDUCTORS
元件分類：	通信及網(wǎng)絡(luò)
英文描述：	SPECIALTY TELECOM CIRCUIT, PDSO8
文件頁(yè)數(shù)：	318/1069頁(yè)
文件大?。?/td>	14303K
代理商：	E5550F-S8

SAM4CP [DATASHEET]

43051E–ATPL–08/14

Reinforced Safety Watchdog Timer (RSWDT)

When two watchdog timers are implemented in a device, the second one, the Reinforced Safety Watchdog Timer

(RSWDT) works in parallel with the Watchdog Timer (WDT) to reinforce safe watchdog operations.

The RSWDT can be used to reinforce the safety level provided by the Watchdog Timer (WDT) in order to prevent system

lock-up if the software becomes trapped in a deadlock. The RSWDT works in a fully operable mode, independent of the

Watchdog Timer. Its clock source is automatically selected from either the slow RC oscillator clock or main RC oscillator

divided clock to get an equivalent slow RC oscillator clock. If the Watchdog Timer clock source (for example the 32 kHz

crystal oscillator) fails, the system lock-up is no longer monitored by the Watchdog Timer as the second watchdog timer,

RSWDT, will perform the monitoring. Thus, there is no lack of safety irrespective of the external operating conditions.

This RSWDT shares the same features as the WDT (i.e. a 12-bit down counter that allows a watchdog period of up to 16

seconds with slow clock at 32.768 kHz). It can generate a general reset or a processor reset only. In addition, it can be

stopped while the processor is in debug mode or idle mode.

Embedded Characteristics

System safety level reinforced by means of an independent second watchdog timer.

Automatically selected reliable independent clock source other than that of first watchdog timer.

Windowed Watchdog.

12-bit key-protected programmable counter.

Provides reset or interrupt signals to the system.

Counter may be stopped while the processor is in debug state or in idle mode.

Block Diagram

Figure 19-1.

Reinforced Safety Watchdog Timer Block Diagram

read RSWDT_SR

(to Reset Controller)

(ORed with wdt_fault)

(ORed with wdt_int)

slow RC clock

write RSWDT_MR

main RC clock

main RC frequency

Automatic selection

[CKGR_MOR.MOSCRCEN=0

(WDT_MR. WDDIS

SUPC_MR.XTALSEL=1)]

相關(guān)PDF資料	PDF描述
E5530H-230-GT	SPECIALTY TELECOM CIRCUIT
E5530H-230-S8	SPECIALTY TELECOM CIRCUIT, PDSO8
E5551A-S8	SPECIALTY TELECOM CIRCUIT, PDSO8
E5550F-DOW	SPECIALTY TELECOM CIRCUIT, UUC7
E5551A-DIT	SPECIALTY TELECOM CIRCUIT, UUC7

相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
E5551A-DIT	制造商:未知廠家制造商全稱:未知廠家功能描述:Transponder
E5551A-DOW	制造商:未知廠家制造商全稱:未知廠家功能描述:Transponder
E5551A-FP008	制造商:未知廠家制造商全稱:未知廠家功能描述:TRANSPONDER\|CMOS\|SOP\|8PIN\|PLASTIC
E5552	制造商:未知廠家制造商全稱:未知廠家功能描述:Transponder
E555423	制造商:Elo Touch Solutions Inc 功能描述:1729L, 17-INCH LCD, CARROLLTOUCH, USB CONTROLLER, GRAY - Bulk

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