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PCM_CLK
PCM_SYNC
PCM_OUT
PCM_IN
Figure 31: Short Synchronization & Zero Padding Diagram
3.9.3. Reference Design
M35 can only work as a master, providing synchronization and clock source. The reference design is
shown as below.
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.
M35_User_Manual
MSB
12 11 10
9
8
7
6
MSB
12 11 10
9
8
7
6
Module
(Master)
PCM_CLK
PCM_SYNC
PCM_OUT
PCM_IN
Figure 32: Reference Design for PCM
Confidential / Released
5
4
3
2
1
0
Zero padding
5
4
3
2
1
0
Zero padding
PCM_CLK
PCM_SYNC
PCM_IN
PCM_OUT
GSM/GPRS Module Series
M35 User Manual
Peripheral
(Slave)
52 / 85
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