Digi Connect EM Hardware Reference Manual page 40

G P I O
Name
DSR/
GPIO-3
CTS/
GPIO-2
DCD/
GPIO-1
TXD2/
GPIO-8
Power
indicator
LED
/INIT
4 0
D i g i C o n n e c t E M & W i - E M H a r d w a r e R e f e r e n c e
GPIO Pin Use
Register
Category
Bit
PORTA2 Allocated
PORTA1 Allocated
PORTA0 Allocated
PORTC7 Allocated
PORTC6 Allocated
PORTC5 Available
External
Description
Interface
Used for the port1 serial DSR
signal but can be reassigned as
Pin 9 on the
GPIO input or output. If used
main header
with the development board, this
pin maps to GPIO-3.
Used for the port 1 serial CTS
signal but can be reassigned as
Pin 7 on the
GPIO input or output. If used
main header
with the development board, this
pin maps to GPIO-2.
Used for the port 1 serial DCD
signal but can be reassigned as
Pin 8 on the
GPIO input or output. If used
main header
with the development board, this
pin maps to GPIO-1.
Used for port 2 serial transmit but
can be reassigned as GPIO input
Pin 12 on the
or output. If used with the
main header
development board, this pin maps
to GPIO-8.
Used as the power indicator
(always on) but can be reassigned
Connected to as a general purpose LED. It must
the red LED remain a GPIO output for the
LED to operate correctly. This
LED is lit when the signal is low.
Connected to
Should be configured as a GPIO
the button on
input.
the module