Datasheet SCT2400 (CML Microcircuits) - 42

Appendix A
The radio protocol name is DFR and the designation details for DFR is as below: 1. simplex protocol (ISF) structure is as below: Frame structure (39Bytes, 80ms): CCH (3Bytes) + VCH (36bytes) Frame structure (253Bytes,): CCH (3Bytes) + DCH (250bytes) 2. CCH (24bits) structure of voice CALL in ISF mode: 1) Sync type : 1bit (0: voice sync, 1:data sync) 2) Addressing mode : 1bit (0: ISF,1:CSF) 3) VSS (voice call start/stop) : 1bit ( 0:voice frame continue, 1:voice frame end) 4) Call format : 1bit ( 0: peer to peer, 1: group call) Note: if the target id is 0xff--> indicates ALL call. Call format should be set to 1 in ALL call mode. 5) Voice_type:1bit (0: normal, 1: emergency) 6) Vocoder_type:1bit 7) Reserved : 2bits 8) Target address : 8bits 9) Source address : 8bits CCH (3Bytes) Byte[0][Bit0]:Sync type (0：voice sync，1：data sync) Byte[0][Bit1]:Addressing mode (0: ISF,1:CSF） Byte[0][Bit2]:VSS (0:voice frame continue, 1:voice frame end) Byte[0][Bit3]:Call format (0:peer to peer, 1:group call) Byte[0][Bit4]:Voice_type(0:normal,1:emergency) Byte[0][Bit5]:Vocoder_type Byte[0][Bit6-7]:Reserved Byte[1]:Target address Byte[2]:Source address VCH(36Bytes) Vocoder encode data(80ms voice data) DCH (250bytes) SMS Data Copyright ©2019 Wuxi Sicomm Communication Technologies, Inc 42 Document Outline Datasheet Front Page Change History 1. Overview 2. Features 3. Pin Configuration 4. RF Transceiver 4.1. Transmitter 4.2. Receiver 4.3. PLL&VCO 4.4. RC Oscillator 4.5. RF Front-end circuit 5. Baseband Core 5.1. Overview 5.2. Modem 5.3. DFR Protocol Stack 5.3.1. DFR Transmitter Signal Flow 5.3.2. DFR Receiver Signal Flow 6. Programmable Function Keys 7. Control Command Protocol 8. Interface and Timing Sequence 8.1. Power Supply 8.2. Reset and Power Up Timing 8.2.1. Baseband Core Operating Frequency 8.2.2. BOOT Mode 8.3. I2S High-speed Serial Port Timing 8.4. I2C Interface 8.5. UART Interface 8.6. USB Interface 8.7. Other Interfaces 9. Battery Management 10. Specification 10.1. Recommended Operating Conditions 10.2. Power Consumption 10.3. ESD 10.4. Parameter Performance 11. Reference Schematic Diagram 12. Text messaging support 13. Package Information 14. Ordering Information Appendix A End of Document