User's Manual

11. General Purpose I/O
The general purpose I/O pads can be configured to act in three different ways:
 input
 output
 alternate function (internally controlled)
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 GE865 firmware and acts depending on
the function implemented.
For Logic levels please refer to chapter 8.
The following table shows the available GPIO on the GE865 .
Signal
I/O
Function
Type
Input /
output
current
Default
State
ON_OFF
state
State
during
Reset
Note
GPIO_01
I/O
GPIO01 Configurable GPIO
CMOS 2.8V
1uA/1mA
INPUT
0
0
GPIO_02
I/O
GPIO02 Configurable GPIO
CMOS 2.8V
1uA/1mA
INPUT
0
0
Alternate function
(JDR)
GPIO_03
I/O
GPIO03 Configurable GPIO
CMOS 2.8V
1uA/1mA
INPUT
0
0
GPIO_04
I/O
GPIO04 Configurable GPIO
CMOS 2.8V
1uA/1mA
INPUT
0
0
Alternate function
(RF Transmission
Control)
GPIO_05
I/O
GPIO05 Configurable GPIO
CMOS 2.8V
1uA/1mA
INPUT
0
0
Alternate function
(RFTXMON)
GPIO_06
I/O
GPIO06 Configurable GPIO
CMOS 2.8V
1uA/1mA
INPUT
0
0
Alternate function
(ALARM)
GPIO_07
I/O
GPIO07 Configurable GPIO
CMOS 2.8V
1uA/1mA
INPUT
0
0
Alternate function
(BUZZER)
GPIO_08
I/O
GPIO08 Configurable GPIO
CMOS 2.8V
1uA/1mA
INPUT
0
0
GPIO_09
I/O
GPIO09 Configurable GPIO
CMOS 2.8V
1
1
1
Open Drain
GPIO_10
I/O
GPIO10 Configurable GPIO
CMOS 2.8V
1
1
1
Open Drain
Not all GPIO pads support all these three modes:
 GPIO2 supports all three modes and can be input, output, Jamming Detect Output
(Alternate function)
 GPIO4 supports all three modes and can be input, output, RF Transmission Control
(Alternate function)
 GPIO5 supports all three modes and can be input, output, RFTX monitor output
(Alternate function)
 GPIO6 supports all three modes and can be input, output, alarm output (Alternate
function)
 GPIO7 supports all three modes and can be input, output, buzzer output (Alternate
function