User's Manual
Table Of Contents
- Contents
- Table Index
- Figure Index
- 0. Revision history
- 1. Introduction
- 2. Product concept
- 3. Application interface
- 3.1. Pin
- 3.2. Operating modes
- 3.3. Power supply
- 3.4. Power on and down scenarios
- 3.5. Charging interface
- 3.6. Power saving
- 3.7. Summary of state transitions
- 3.8. RTC backup
- 3.9. Serial interfaces
- 3.10. Audio interfaces
- 3.11. SIM card interface
- 3.12. SD card interface
- 3.13. PCM interface
- 3.14. ADC
- 3.15. Behaviors of the RI
- 3.16. Network status indication
- 3.17. Operating status indication
- 4. Antenna interface
- 5. Electrical, reliability and radio characteristics
- 6. Mechanical dimensions
- 7. Storage and manufacturing
- Appendix A: GPRS coding schemes
- Appendix B: GPRS multi-slot classes
M80 Hardware Design
M80_HD_V1.2 - 48 -
3.9.2. Debug Port
Debug Port
Two lines: DBG_TXD and DBG_RXD
It outputs log information automatically.
Debug Port is only used for software debugging and its baud rate must be configured as
460800bps.
Debug Computer
TXD
RXD
GND
Module (DCE)
Debug port
DBG_TXD
DBG_RXD
GND
Figure 22: Reference design for Debug Port
3.9.3. Auxiliary UART Port
Auxiliary UART Port
Two data lines: TXD_AUX and RXD_AUX
Auxiliary UART port is used for AT command only and doesn’t support GPRS data, CSD
FAX, Multiplexing function etc.
Auxiliary UART port supports the communication baud rates as the following:
4800, 9600, 14400, 19200,28800,38400,57600,115200.
The default baud rate setting is 115200bps, and doesn’t support autobauding. The baud rate
can be modified by AT+QSEDCB command. For more details, please refer to document [1].