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參數(shù)資料
| 型號： | LC89057W-VF4 |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP48 |
| 封裝： | 7 X 7 MM, SQFP-48 |
| 文件頁數(shù)： | 6/61頁 |
| 文件大?。?/td> | 570K |
| 代理商： | LC89057W-VF4 |
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LC89057W-VF4
No.7202-14/61
9.1.4 Switching between Master clock and clock source
The RMCK, RBCK, and RLRCK (hereunder, R system), and the SBCK and SLRCK (hereunder, S system) clock
sources can be selected among the following three master clocks.
(1) PLL source
(256fs or 512fs)
(2) XIN source
(12.288MHz or 24.576MHz)
(3) TMCK source (256fs)
There are two ways available for clock source switching; one is to set with the R system and the S system interlocked,
and the other is to set only the R system while XIN source is fixed in the S system. This setting is carried out with
SELMTD, OCKSEL, and RCKSEL.
The clock source is automatically switched between PLL clock and XIN clock by locking/unlocking the PLL. During
this period, continuity of the clock is maintained. However, if the clock source is switched with SELMTD, continuity
of the S system is not maintained.
The clock source can be switched to XIN with OCKSEL and RCKSEL, regardless of the PLL status. The clock source
switch command and each clock output of the R and S systems are shown below.
Table 9.1 Correspondence between Clock Source Switch Commands and Clock Output Pins
SELMTD
R System Output Clock
S System Output Clock
0
According to OCKSEL
1
According to RCKSEL
Fixed to XIN source
Table 9.2 Relationship between Clock Source Switch Commands and Clock Sources when PLL Locked/Unlocked
R System Clock Source
S System Clock Source
SELMTD
OCKSEL
RCKSEL
Locked
Unlocked
Locked
Unlocked
0
X
PLL
XIN
PLL
XIN
0
1
X
XIN
X
0
PLL
XIN
1
X
1
XIN
The TMCK source is selected with EXSYNC. This setting results in the same operation as the one set to 256fs with
the PLL source. Set PLLSEL to 256fs to use.
When data synchronized with the TMCK source is input, various clocks are output with the TMCK source as the
master clock, in a manner similar to the PLL clock status. In this case as well, the XIN source is switched with
OCKSEL and RCKSEL. When the TMCK source is not supplied or the input data is not synchronized, the source is
switched to the XIN source, in a manner similar to the PLL source unlocked status.
The PLL status can be always monitored with RERR even after the XIN source is switched. Moreover, the processed
information can be read with the microcontroller interface regardless of the PLL status.
When the PLL changes from the locked status to the unlocked, the timing for switching the clock from the PLL source
to the XIN source can be changed with XTWT[1:0]. Use these commands if noise occurs during clock switching.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LC89057W-VF4AD-E | 制造商:ON Semiconductor 功能描述: |
| LC89057W-VF4A-E | 功能描述:音頻發(fā)送器、接收器、收發(fā)器 RoHS:否 制造商:Cirrus Logic 工作電源電壓:3.3 V, 5 V 電源電流:11.8 mA 通道數(shù)量:1 最大工作溫度:+ 70 C 接口類型:I2C, SPI 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-28 封裝: |
| LC89057W-VF4A-TBM-E | 制造商:ON Semiconductor 功能描述: 制造商:ON Semiconductor 功能描述:AUDIO I/F RECEIVER |
| LC89058W | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:CMOS IC Digital Audio Interface Receiver |
| LC89058WA-E | 功能描述:音頻發(fā)送器、接收器、收發(fā)器 RoHS:否 制造商:Cirrus Logic 工作電源電壓:3.3 V, 5 V 電源電流:11.8 mA 通道數(shù)量:1 最大工作溫度:+ 70 C 接口類型:I2C, SPI 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-28 封裝: |
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