User's Manual

GE865 Hardware User Guide
1vv0300799 Rev.6 - 04/06/09
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 39 of 58
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 and 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 7.
The following GPIO are available on the GE865-QUAD:
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)