LISA-U1 series - System Integration Manual
3G.G2-HW-10002-3
Preliminary
System description
Page 82 of 125
AT+UGPS command is set to 1 and the parameter <GPS_IO_configuration> of AT+UGPRF
command is set to 16
o
Tri-state with an internal active pull-down enabled, otherwise (default setting)
The pin that provides the “GPS data ready” function must be connected to the data ready output of the
u-blox GPS receiver (i.e. the pin TxD1 of the u-blox GPS receiver) on the application board.
GPS RTC sharing
:
Only the
GPIO4
pin will provide the “GPS RTC sharing” function, to provide a RTC (Real Time Clock)
synchronization signal to the u-blox GPS receiver connected to the wireless module, setting the parameter
<gpio_mode> of AT+UGPIOC command to 5.
The pin configured to provide the “GPS RTC sharing” function will be set as
o
Output, to provide a RTC (Real Time Clock) synchronization signal to the u-blox GPS receiver if the
parameter <mode> of AT+UGPS command is set to 1 and the parameter <GPS_IO_configuration>
of AT+UGPRF command is set to 32
o
Output / Low, otherwise (default setting)
The pin that provides the “GPS RTC sharing” function must be connected to the RTC synchronization input
of the u-blox GPS receiver (i.e. the pin EXTINT0 of the u-blox GPS receiver) on the application board.