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 - 47 -
reliability of the mass data communication.
Host (DTE)
Controller
Module(DCE)
RTS
CTS
RTS
CTS
GND
RXD
TXD TXD
RXD
GND
Figure 20: Reference design for UART Port with hardware flow control
3.9.1.3. Software upgrade
The TXD, RXD can be used to upgrade software. The PWRKEY pin must be pulled down before
the software upgrade. Please refer to the following figures for software upgrade.
IO Connector
TXD
RXD
GND
PWRKEY
Module (DCE)
Serial port
TXD
RXD
GND
PWRKEY
Figure 21: Reference design software upgrade
Note: The firmware of module might need to be upgraded due to certain reasons, it is
recommended to reserve these pins in the host board for firmware upgrade. For detailed design,
please refer to document [11].