AT697F datasheet(48/155 Pages) ATMEL

Nome de Peças	AT697F

Descrição Electrónicos	Rad-Hard 32 bit SPARC V8 Processor

PDF	155 Pages

Scroll/Zoom	100%

Fabricante Electrônico	ATMEL [ATMEL Corporation]

Página de início	http://www.atmel.com

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48 / 155 page

7703C–AERO–6/09

AT697F ADVANCE INFORMATION

Watchdog

The watchdog operates the same way as the timers, with the difference that it is always enabled

and upon underflow asserts the external signal WDOG. This signal can be used to generate a

system reset.

If the watchdog counter is refreshed by writing to WDG register before the counter reaches zero, the coun-

ter restarts counting from the new value.

If the counter is not refreshed before the counter reaches zero, WDOG signal is asserted.

After reset, the watchdog is automatically enabled and starts running. The watchdog is reset to a “all

ones”. Together with the default prescaler ratio of 4, the time until first expiration of the watchdog after

reset is about 2^34 clock cycles.

Note:

A read access gives the decounting value of the watchdog, the reload value itself is not stored in

the processor.

Figure 32. Watchdog Block Diagram

Control Logic

Watchdog Reg.

=0xFFFFFFFF

clock

WDG

WDOG

AT697F Folha de dados(PDF) 48 Page - ATMEL Corporation