数据搜索系统,热门电子元器件搜索 |
|
SI4731 数据表(PDF) 6 Page - Silicon Laboratories |
|
SI4731 数据表(HTML) 6 Page - Silicon Laboratories |
6 / 302 page AN332 6 Rev. 1.0 4. Commands and Responses Commands control actions, such as power up, power down, or tune to a frequency, and are one byte in size. Arguments are specific to a given command and are used to modify the command. For example, after the TX_TUNE_FREQ command, arguments are required to set the tune frequency. Arguments are one byte in size, and each command may require up to seven arguments. Responses provide the system controller status information and are returned after a command and its associated arguments are issued. All commands return a one byte status indicating interrupt state and clear-to-send the next command. Commands may return up to 15 additional response bytes. A complete list of commands is available in “5. Commands and Properties”. Table 2 shows an example of tuning to a frequency using the TX_TUNE_FREQ command. This command requires that a command and three arguments be sent and returns one status byte. 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 power-up. Examples of properties are TX _PREEMPHASIS and REFCLK_FREQ. A complete list of properties is available in Section “5. Commands and Properties”. Table 3 shows an example of setting the REFCLK frequency using the REFCLK_FREQ property by sending the SET_PROPERTY command and five argument bytes. ARG1 of the SET_PROPERTY command is always 0x00. ARG2 and ARG3 are used to select the property number, PROP (0x0201 in this example), and ARG4 and ARG5 are used to set the property value, PROPD (0x8000 or 32768 Hz in the example). The implementation of the command and response procedures in the system controller differs for each of the three bus modes. Section "6. Control Interface" on page 206 details the required bit transactions on the control bus for each of the bus modes. Table 2. Using the TX_TUNE_FREQ Command Action Data Description CMD 0x30 TX_TUNE_FREQ ARG1 0x00 ARG2 0x27 Set Station to 101.1 MHz ARG3 0x7E (0x277E = 10110 with 10 kHz step size) STATUS 0x80 Reply Status. Clear-to-send high. Table 3. Using the SET_PROPERTY Command Action Data Description CMD 0x12 SET_PROPERTY ARG1 0x00 ARG2 (PROP) 0x02 REFCLK_FREQ ARG3 (PROP) 0x01 ARG4 (PROPD) 0x80 32768 Hz ARG5 (PROPD) 0x00 STATUS 0x80 Reply Status. Clear-to-send high. |
类似零件编号 - SI4731 |
|
类似说明 - SI4731 |
|
|
链接网址 |
隐私政策 |
ALLDATASHEETCN.COM |
ALLDATASHEET是否为您带来帮助? [ DONATE ] |
关于 Alldatasheet | 广告服务 | 联系我们 | 隐私政策 | 链接交换 | 制造商名单 All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |