SAM3A4C Atmel Corporation, SAM3A4C Datasheet - Page 265

• Manufacturer Part Number: SAM3A4C
• Manufacturer: Atmel Corporation

16. Watchdog Timer (WDT)
16.1
16.2
16.3
Figure 16-1. Watchdog Timer Block Diagram
11057A–ATARM–17-Feb-12
11057A–ATARM–17-Feb-12
Description
Embedded Characteristics
Block Diagram
WDRSTT
WDT_CR
read WDT_SR
or
reset
write WDT_MR
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.
• 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
• AMBA
WDT_MR
– Interfaces to the ARM
WDD
WDERR
™
<= WDD
-compliant Interface
set
reset
reload
WDT_MR
WDV
12-bit Down
1
WDUNF
Counter
Current
Value
= 0
®
reset
set
Advanced Peripheral Bus
0
1/128
reload
WDRSTEN
WDT_MR
WDT_MR
WDFIEN
SLCK
(to Reset Controller)
wdt_int
wdt_fault
SAM3X/A
SAM3X/A
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