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ST75C540 数据表(PDF) 28 Page - STMicroelectronics |
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ST75C540 数据表(HTML) 28 Page - STMicroelectronics |
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28 / 84 page  VII - COMMAND SET DESCRIPTION Commands are presented according to the following form : COMMAND Command Name Meaning COMMAND Opcode Hexadecimal digit XX XX XX X X Synopsis Short description of the functions performed by the command. Parameters Field Byte Pos. Value Definition Name X b..a xx * Explanation of the parameter Default value Field Name of the addressed bit field. Byte Index (or address in the dual port RAM) of the parameter byte (from 1 to 4). Pos. Bit field position inside the parameter byte. Can either be a single position (from 0 to 7, 0 being LSB) or a range. Value Possiblevaluesfor thebit(resp. bitfield). Rangemeansall valuesare allowed.Astarmeansa default value. Valuesare expressed either under the form of a bit string, or under hexadecimal format. ASEL ASEL Opcode: 0B 00 001 01 1 Synopsis Select the analog path options. This command select the Attenuation/Mute of the outputs TxA1/TxA2 and SPK1/SPK2/SPK3. This command select also the source of the Mic signal MIC1/MIC2/MIC2 and the source of the Line Signal RxA/MIC3. Parameters Field Byte Pos. Value Definition ASEL_ASPK1 1 7..4 0000* 0001 0010 ... 1010 1011 Other Infinity attenuation 30dB attenuation 27dB attenuation ... 3dB attenuation 0dB attenuation Reserved ASEL_MICSEL 2 1..0 00* 01 10 11 Select Rx input as MIC1 Select Rx input as MIC1 Select Rx input as MIC2 Select Rx input as MIC3 ASEL_LINESEL 2 2 0* 1 Select RxA as line input Select Mic3 as line input ASEL_ESPK1 2 3 0* 1 SPK1 output muted SPK1 output normal ASEL_ESPK2 2 4 0* 1 SPK2 output muted SPK2 output normal ASEL_ESPK3 2 5 0* 1 SPK3 output muted SPK3 output normal ASEL_MTXA 2 7 0* 1 TxA output normal TxA output muted CALL Call a Subroutine CALL Opcode: 19 00 011 00 1 Synopsis CALL allows to execute a part of the ST75C530/540 firmware with a specific argument. Parameters Field Byte Pos. Value Definition C_ADDR_L 1 7..0 Low byte of the call address C_ADDR_H 2 7..0 High byte of the call address C_DATA_L 3 7..0 Low byte of the argument C_DATA_H 4 7..0 High byte of the argument This instruction can be used with SGS-THOMSON Microelectronics Application Laboratory Support for special applications development or debugging needs. Contact your local representative. ST75C530 - ST75C540 28/84 |
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