Rainbow Electronics W90N745CDG User Manual
Page 299
W90N745CD/W90N745CDG
Publication Release Date: September 22, 2006
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295
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Revision
A2
Continued
BITS
DESCRIPTIONS
[6]
WTIE
Watchdog Timer Interrupt Enable
0 = Disable the Watchdog timer interrupt
1 = Enable the Watchdog timer interrupt
[5:4]
WTIS
Watchdog Timer Interval Select
These two bits select the interval for the Watchdog timer. No matter
which interval is chosen, the reset timeout is always occurred 512
WDT clock cycles later than the interrupt timeout.
WTIS
Interrupt
Timeout
Reset Timeout
Real Time Interval
(CLK=15MHz/256)
00 2
14
clocks
2
14
+ 1024
clocks
0.28 sec.
01 2
16
clocks
2
16
+ 1024
clocks
1.12 sec.
10 2
18
clocks
2
18
+ 1024
clocks
4.47 sec.
11 2
20
clocks
2
20
+ 1024
clocks
17.9 sec.
[3]
WTIF
Watchdog Timer Interrupt Flag
If the Watchdog timer interrupt is enabled, then the hardware will set
this bit to indicate that the Watchdog timer interrupt has occurred. If
the Watchdog timer interrupt is not enabled, then this bit indicates that
a timeout period has elapsed.
0 = Watchdog timer interrupt does not occur
1 = Watchdog timer interrupt occurs
NOTE: This bit is read only, but can be cleared by writing 1 to this bit.
[2]
WTRF
Watchdog Timer Reset Flag
When the Watchdog timer initiates a reset, the hardware will set this
bit. This flag can be read by software to determine the source of
reset. Software is responsible to clear it up manually. If WTRE is
disabled, then the Watchdog timer has no effect on this bit.
0 = Watchdog timer reset does not occur
1 = Watchdog timer reset occurs
NOTE: This bit is read only, but can be cleared by writing 1 to this bit.