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AT91SAM7X256 Datasheet(PDF) 81 Page - ATMEL Corporation

No. de Pieza. AT91SAM7X256
Descripción  AT91 ARM Thumb-based Microcontrollers
Descarga  664 Pages
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Fabricante  ATMEL [ATMEL Corporation]
Página de inicio  http://www.atmel.com
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AT91SAM7X256 Datasheet(HTML) 81 Page - ATMEL Corporation

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81
6120D–ATARM–02-Feb-06
AT91SAM7X256/128 Preliminary
17. Watchdog Timer (WDT)
17.1
Overview
The Watchdog Timer can be used to prevent system lock-up if the software becomes trapped in
a deadlock. It features a 12-bit down counter that allows a watchdog period of up to 16 seconds
(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.
17.2
Block Diagram
Figure 17-1. Watchdog Timer Block Diagram
= 0
10
set
reset
read WDT_SR
or
reset
wdt_fault
(to Reset Controlle
r)
set
reset
WDFIEN
wdt_int
WDT_MR
SLCK
1/128
12-bit Down
Counter
Current
Value
WDD
WDT_MR
<= WDD
WV
WDRSTT
WDT_MR
WDT_CR
reload
WDUNF
WDERR
reload
write WDT_MR
WDRSTEN
WDT_MR


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