Datasheet
Table Of Contents
- Document Information
- Contents
- 1 Functional description
- 1.1 Overview
- 1.2 Product features
- 1.3 Performance
- 1.4 Block diagram
- 1.5 Supported GNSS Constellations
- 1.6 Assisted GNSS (A-GNSS)
- 1.7 Augmentation Systems
- 1.8 Broadcast Navigation Data
- 1.9 Untethered Dead Reckoning (UDR)
- 1.10 Odometer
- 1.11 Data logging
- 1.12 Geofencing
- 1.13 Message Integrity Protection
- 1.14 Spoofing Detection
- 1.15 TIMEPULSE
- 1.16 Protocols and interfaces
- 1.17 Interfaces
- 1.18 Clock generation
- 1.19 Power management
- 1.20 Antenna
- 2 Pin Definition
- 3 Configuration management
- 4 Electrical specification
- 5 Mechanical specifications
- 6 Reliability tests and approvals
- 7 Product handling & soldering
- 8 Default messages
- 9 Labeling and ordering information
- Related documents
- Revision history
- Contact
NEO-M8U - Data Sheet
UBX-15015679 - R06 Configuration management Page 16 of 27
Product Information
3 Configuration management
Configuration settings can be modified with UBX configuration messages. The modified settings
remain effective until power-down or reset. Settings can also be saved in battery-backed RAM, Flash
or both using the UBX-CFG-CFG message. If settings have been stored in battery-backed RAM then
the modified configuration will be retained as long as the backup battery supply is not interrupted.
Settings stored in Flash memory will remain effective even after power-down and do not require
backup battery supply.
3.1 Interface Selection (D_SEL)
At startup Pin 2 (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 NEO-M8U module can communicate to a host via SPI.
PIN # D_SEL=”1”
(left open)
D_SEL =”0”
(connected to GND)
20 UART TX SPI MISO
21 UART RX SPI MOSI
19 DDC SCL SPI CLK
18 DDC SDA SPI CS_N
Table 8: Data interface selection by D_SEL