CAM-M8 - Data Sheet
3 Configuration management
Configuration settings can be modified with UBX configuration messages. The modified settings
remain effective until power-down or reset. If these settings have been stored in battery-backup
RAM, then the modified configuration will be retained, as long as the backup battery supply is not
interrupted.
☞
For more information about configuration management, see the u-blox 8 / u-blox M8 Receiver
Description Including Protocol Specification [2].
3.1 Interface Selection (D_SEL)
At startup, pin 20 (D_SEL) determines which data interfaces are used for communication. If D_SEL
is set high or left open, UART and DDC become available. If D_SEL is set low, i.e. connected to ground,
the CAM-M8Q/C modules can communicate to a host via SPI.
PIN #
D_SEL = ”1”
(left open)
D_SEL = ”0”
(connected to GND)
25
26
6
TXD
RXD
SCL
SDA
SPI MISO
SPI MOSI
SPI CLK
3
SPI CS_N
Table 6: Data interface selection by D_SEL
UBX-15031574 - R04
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