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ST75C540 数据表(PDF) 38 Page - STMicroelectronics |
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ST75C540 数据表(HTML) 38 Page - STMicroelectronics |
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38 / 84 page  SETGN Set Output Gain SETGN Opcode: 02 000 00010 Synopsis SETGN is a command which sets the scaling factor of the transmit samples. It is used for setting the output level or for setting the level of the tone generators. The gain value is given in the form of a 2’s complement 16-bit value. Parameter Field Byte Pos. Value Definition GAIN_L 1 7..0 range FF* Low byte of the 16-bit gain value GAIN_H 2 7..0 range 7F* High byte of the 16-bit gain value Example Gain (dB) Gain (Hex) Gain (dB) Gain (Hex) Gain (dB) Gain (Hex) 0 7FFF -5 47FA -10 287A -1 7214 -6 4026 -11 2413 -2 65AC -7 392C -12 2026 -3 5A9D -8 32F5 -13 1CA7 -4 50C3 -9 2D6A -14 198A The multiplication factor is : 10 (-1/20) = 0.89125 for 1dB step. SLEEP Turn to Sleep Mode SLEEP Opcode: 03 000 00011 Synopsis SLEEP is used to force the ST75C530/540 to turn to low power mode. Parameter Non parametric command. Note : When receiving this command the ST75C530/540 will stop processing and so cannot have the regular handshake protocol. It does not increment the COMACK, neither generate an Interrupt. STOP FAX Stop Transmitter STOP Opcode: 25 001 00101 Synopsis STOP is used, in FAX Modes, to force the ST75C530/540 to turn off the transmitter in accordance with the corresponding ITU-T V.33/V.17/V.29/V.27recommendation. Parameter Non parametric command. Note : When receiving this command the ST75C530/540 will stop sending regular Data. This command must be preceded by a XMIT Stop command. The ST75C530/540 will wait until all the transmit buffers are sent before starting the Stop sequence. SYNC FAX Synchronize the Receiver SYNC Opcode: 26 0 0 1001 1 0 Synopsis SYNC is used, in FAX Modes, to force the ST75C530/540 to Start/Stop the receiver in accordance with the corresponding ITU-T V.33/V.17/V.29/V.27recommendation.As soon as the ST75C530/540 receives the SYNC Start command it sets its receiver to detect the FAX synchronization signal.This command is the equivalent HSHK command for the receiver. Parameters Field Byte Pos. Value Definition RX_SYNC 1 0 0* 1 Stop receiver Start receiver synchronization VII - COMMAND SET DESCRIPTION (continued) ST75C530 - ST75C540 38/84 |
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