SPMC/DPMC-122 G
ETTING
S
TARTED
M
ANUAL
D
Y
4 S
YSTEMS
I
NC
.
2-8
812628 V
ERSION
1 O
CTOBER
2003
W
ATCHDOG
T
IMER
B
EHAVIOUR
The SCP/DCP-122 offers the capability of enabling the watchdog timer immediately following
reset without the need for software programming or initialization. This mode of operation is
selected by leaving E9-E10 open. The watchdog timer will generate a card reset if left to
expire.
With the E9-E10 jumper installed, the watchdog timer is disabled following power-up reset;
however, it can be enabled by application software.
F
IGURE
2.6: Watchdog Timer Power-up Jumper
T
ABLE
2.6: Watchdog Timer Power-up Behaviour
Option
Jumper Setting
Watchdog timer is disabled following power-up:
(generates interrupt on timeout).
Watchdog timer is enabled following power-up:
(generates a card reset on timeout).
Connect E9-E10
Open E9-E10
E1
E5
E7
E1
1
E1
3
E2
E6
E8
E1
2
E1
4
E3
E4
E9
E1
0
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