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SI4822 데이터시트(PDF) 11 Page - Silicon Laboratories |
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SI4822 데이터시트(HTML) 11 Page - Silicon Laboratories |
11 / 71 page AN610 Rev. 0.3 11 6. Commands and Responses Commands control actions, such as ATDD_GET_STATUS. Arguments are specific to a given command and are used to modify the command. For example, after the ATDD_POWER_UP command, arguments are required to set the band number, band top/bottom frequencies, channel spacing and optional features like China TV channel audio, universal AM band and more. Arguments are one byte in size, and each command may require up to seven argument bytes. Responses provide the system controller with status information and are returned after a command and its associated arguments are issued. All commands return a one byte status containing minimum the 1 bit clear-to- send the next command and 1 bit error status. Commands may return up to 15 additional response bytes. A complete list of commands is available in Section “7. Commands and Properties” . Table 2 shows an example of the ATDD_POWER_UP command. This command requires that a command and optionally 7 argument bytes to be sent and that one status byte be returned. The table is broken into three columns. The first column lists the action taking place: command (CMD), argument (ARG), status (STATUS), or response (RESP). The second column lists the data byte or bytes in hexadecimal that are being sent or received. An arrow preceding the data indicates data being sent from the device to the system controller. The third column describes the action. Properties are special command arguments used to modify the default device operation and are generally configured immediately after powerup. An example of a property is FM_MODE_DE_EMPHASIS. A complete list of properties is available in “7. Commands and Properties” . Table 3 shows an example of setting the digital volume level using the RX_VOLUME property by sending the SET_PROPERTY command and 1 argument bytes. ARG1 of the SET_PROPERTY command is always 0x00. ARG2 and ARG3 are used to select the property number, PROP (0x04000 in this example).,ARG4 and ARG5 are used to set the property value, PROPD (0x003F max digital volume level in the example). Section “8. Control Interface” details the required bit transactions on the 2-wire bus mode. Table 3. Using the ATDD_POWER_UP Command Action Data Description CMD ARG1 ARG2 ARG3 ARG4 ARG5 ARG6 ARG7 STATUS 0xE1 0x80 0x22 0x60 0x2A 0x30 0x0A 0x00 0x80 ATDD_POWER_UP Band index = 0 (i.e., FM1), Enable crystal, typical crystal waiting time Set band bottom frequency to 88 MHz e.g., 0x2260 8800 (in 10 kHz unit) Set band top frequency to 108 MHz e.g., 0x2A30 10800 (in 10 kHz unit) Set channel spacing to 100 kHz (10 kHz unit) Disable Si4827/44B features Reply Status. Clear-to-send high Table 4. Using the SET_PROPERTY Command Action Data Description CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x12 0x00 0x40 0x00 0x00 0x3F 0x80 SET_PROPERTY RX_VOLUME Set digital volume to max volume level (63) Reply Status. Clear-to-send high |
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