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 - 66 -
3.13.3. Reference design
As M80 only acts as a master, the module provides synchronization and clock source. The
reference design is shown as below.
PCM_SYNC
PCM_CLK
PCM_OUT
PCM_IN
PCM_SYNC
PCM_CLK
PCM_IN
PCM_OUT
Module
(Master)
Customer device
(Slave)
Figure 40: Reference design for PCM
3.13.4. AT command
“AT+QPCMON” can configure PCM parameter. AT command format is shown as below:
AT+QPCMON= mode, Sync_Type, Sync_Length, SignExtension, MSBFirst.
Table 23：AT command description
Parameter
scope
Description
Mode
0~2
0：Close PCM
1：Open PCM
2：Open PCM when audio talk is set
up
Sync_Type
0~1
0：Short synchronization
1：Long synchronization
Sync_Length
1~8
Programmed from one bit to eight
bit
SignExtension
0~1
Not supported
MSBFirst
0~1
0：MSB first
1：Not supported