COMe-mEL10 - User Guide Rev. 1.1
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3.14.
UART (option)
The UART serial communications interface option supports up to two serial RX/TX ports defined in the COMe
specification on pins A98 (SERO_TX) and A99 (SERO_RX) for UART0, and pins A101 (SER1_TX) and A102 (SER1_RX) for
UART1.
The UART option is 16550 compatible and
features:
64-byte TX /RX host controller FIFOs
On-chip bit rate (baud rate) generator
Prioritized interrupt identification
Programmable FIFO enable/disable
3.15.
Watchdog Timer (WTD
) Dual Stage
The watchdog timer interrupt is a hardware or software timer implemented by the module to the carrier board if there
is a fault condition in the main program; the watchdog triggers a system reset or other corrective actions after a
specific time, with the aim to bring the system back from a non-responsive to normal state.
The COMe-mEL10 supports an independently programmable watchdog that works with two stages that can be used
stage by stage.
Table 18: Dual Staged Watchdog Timer- Time-Out Events
0000b
No action
Stage is off and will be skipped
0001b
Reset
Restarts the module and starts a new POST and operating system
0101b
Delay -> No action
Might be necessary when an operating system must be started and the time for the first
trigger pulse must be extended. Only available in the first stage!
1000b
WDT Only
Triggers WDT pin on the carrier board connector (COM Express® pin B27) only
1001b
Reset + WDT
1101b
DELAY + WDT -> No
action
3.15.1.
Watchdog Timer Signal
The watchdog interrupt (WDT) on the COM Express® connector’s pin B27 indicates a Watchdog time-out event. The
WDT signal is configurable to any of the two stages. For more details, contact Kontron Support.
