CAM-M8 - Data Sheet

UBX-15031574 - R04

Page 20 of 31

Production Information

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.

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

TXD

SPI MISO

26

RXD

SPI MOSI

6

SCL

SPI CLK

3

SDA

SPI CS_N

Table 6: Data interface selection by D_SEL