User's Manual

GE864-AUTO Hardware User Guide
1vv0300779 Rev.0 - 20/06/08
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10 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 GE864-AUTO firmware and acts depending on the function
implemented. For Logic levels please refer to chapter 7.
The followin
g GPIO are available on the GE864-AUTO:
Ball Signal I/O Function Type
Input /
output
current
Default
State
State
during
Reset
Note
B3 TGPIO_04 I/O GPIO04 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT x
Alternate function (RF
Transmission Control)
B5 TGPIO_06 I/O GPIO06 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT
HIGH
(see Fig.01)
Alternate function
(ALARM)
E6 TGPIO_01 I/O GPIO01 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT x Alternate function (JDR)
H3 TGPIO_08 I/O GPIO08 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT x PCM_TX
H5 TGPIO_02 I/O GPIO02 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT x PCM_WAO
K7 TGPIO_03 I/O GPIO03 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT x PCM_RX
K8 TGPIO_05 I/O GPIO05 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT x
Alternate function
(RFTXMON)
L9 TGPIO_07 I/O GPIO07 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT x
Alternate function
(BUZZER)
D7 PCM_CLK I/O Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT x PCM audio *
Not all GPIO pads support all these three modes:
• GPIO1 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)