Users Manual

GSM/GPRS Module Series
M66 Hardware Design
M66_Hardware_Design Confidential / Released 52 / 82
Figure 30: Reference Design for PCM
3.9.4. AT Command
There are two AT commands about the configuration of PCM, listed as below.
AT+QPCMON can configure operating mode of PCM.
AT+QPCMON=mode, Sync_Type, Sync_Length, SignExtension, MSBFirst
Table 14: QPCMON Command Description
AT+QPCMVOL can configure the volume of input and output.
AT+QPCMVOL=vol_pcm_in, vol_pcm_out
Parameter Scope Description
Mode 0,2
0: Close 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 bits
SignExtension 0~1 Not supported
MSBFirst 0~1
0: MSB first
1: Not supported