User's Manual

UE866 HARDWARE USER GUIDE 1vv0301157 Rev.7 • 2015-04-17 39 of 68
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5.6 General Purpose I/O
The UE866 module is provided by a set of Configurable Digital Input / Output pins (CMOS 1.8V)
Input pads can only be read; they report the digital value (high or low) present on the pad at the read
time.
Output pads can only be written or queried and set the value of the pad output.
An alternate function pad is internally controlled by the UE866 firmware and acts depending on the
function implemented.
The following table shows the available GPIO on the UE866:
PAD
Signal
I/O
Drive
Strength
Default
State
NOTE
C5
GPIO_01
I/O
1 mA
INPUT
Alternate function Digital Audio
Interface (WA0
C6
GPIO_02
I/O
1 mA
INPUT
Alternate functions Jammer Detect Report
/ Digital Audio Interface (RX)
D6
GPIO_03
I/O
1 mA
INPUT
Alternate function Digital Audio
Interface (TX)
D5
GPIO_04
I/O
1 mA
INPUT
Alternate function
TX Disable / Digital Audio Interface
(CLK)
B5
GPIO_05
I/O
1 mA
INPUT
B4
GPIO_06
I/O
1 mA
INPUT
Alternate function ALARM
C4
GPIO_07
I/O
1 mA
INPUT
Alternate function STAT LED
NOTE:
The internal GPIO’s pull up/pull down could be set to the preferred status for
the application using the AT#GPIO command.
Please refer for the AT Commands User Guide for the detailed command
Syntax.
WARNING:
During power up the GPIOs may be subject to transient glitches.