User Manual

GPIO
40  Digi Connect EM & Wi-EM Hardware Reference
DSR/
GPIO-3
PORTA2 Allocated
Pin 9 on the
main header
Used for the port1 serial DSR
signal but can be reassigned as
GPIO input or output. If used
with the development board, this
pin maps to GPIO-3.
CTS/
GPIO-2
PORTA1 Allocated
Pin 7 on the
main header
Used for the port 1 serial CTS
signal but can be reassigned as
GPIO input or output. If used
with the development board, this
pin maps to GPIO-2.
DCD/
GPIO-1
PORTA0 Allocated
Pin 8 on the
main header
Used for the port 1 serial DCD
signal but can be reassigned as
GPIO input or output. If used
with the development board, this
pin maps to GPIO-1.
TXD2/
GPIO-8
PORTC7 Allocated
Pin 12 on the
main header
Used for port 2 serial transmit but
can be reassigned as GPIO input
or output. If used with the
development board, this pin maps
to GPIO-8.
Power
indicator
LED
PORTC6 Allocated
Connected to
the red LED
Used as the power indicator
(always on) but can be reassigned
as a general purpose LED. It must
remain a GPIO output for the
LED to operate correctly. This
LED is lit when the signal is low.
/INIT PORTC5 Available
Connected to
the button on
the module
Should be configured as a GPIO
input.
GPIO Pin Use
Name
Register
Bit
Category
External
Interface
Description