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 - 46 -
3.9.1.2. The connection of UART
The connection between module and host using UART Port is very flexible. Three connection
styles are illustrated as below.
Reference design for Full-Function UART connection is shown as below when it is applied in
modulation-demodulation.
TXD
RXD
RTS
CTS
DTR
DCD
RI
TXD
RXD
RTS
CTS
DTR
DCD
RING
Module (DCE)
PC (DTE)
UART port
UART Port
GND GND
Figure 18: Reference design for Full-Function UART
Three-line connection is shown as below.
Host (DTE)
Controller
Module(DCE)
TXD
RXD
GND
UART PORT
RTS
0R
TXD
RXD
GND
Figure 19: Reference design for UART Port
UART Port with hardware flow control is shown as below. This connection will enhance the