u-blox LEA-5 Series Hardware Manual page 20

SSN_N
MISO
MOSI
SCK
u-blox GPS Receiver
Figure 11: Connecting to SPI Master
1.5.4.4 SPI and u-blox 5 configuration pins
With some u-blox 5 modules the SPI MOSI, MISO and SCK pins have a shared configuration function at start up.
To secure correct receiver operation make sure that the SS_N pin is high at start up. Afterwards the SPI function
will not affect the configuration pins.
GPS.G5-MS5-09027-A2
VDD
VDD
SCS_N
MI
MO
SCK
SPI M aster
LEA-5, NEO-5, TIM-5H - Hardware Integration Manual
Released Hardware description
Page 20 of 68