參數(shù)資料
型號: XE8000EV104
廠商: Semtech
文件頁數(shù): 103/156頁
文件大?。?/td> 0K
描述: EVAL BOARD FOR XE8805AMI028LF
標準包裝: 1
類型: MCU
適用于相關(guān)產(chǎn)品: XE88LC05AMI028
所含物品: 完全組裝的評估板
Semtech 2006
www.semtech.com
7-9
XE8805/05A
7.8
Prescalers
The clock generator block embeds two divider chains: the high prescaler and the low prescaler.
The high prescaler is made of an 8 stage dividing chain and the low prescaler of a 15 stage dividing chain.
Features:
High prescaler can only be driven with RC clock (bit EnableRc have to be set, see Table 7-12).
Low prescaler can be driven from the high prescaler or directly with the Xtal clock when bit EnableXtal is set to
1, bit EnExtClock is set to 0 and ExtClk is equal at 0.
Bit ResPre in the RegSysPre0 register allows to reset synchronously the low prescaler, the low prescaler is
also automatically cleared when bit EnableXtal is set. Both dividing chains are reset asynchronously by the
resetsleep signal.
Bit ColdXtal=1 indicates the Xtal is in its start up phase. It is active for 37268 Xtal cycles after setting
EnableXtal.
7.9
32 kHz frequency selector
A decoder is used to select from the high prescaler the frequency tap that is the closest to 32 kHz to operate the
low prescaler when the Xtal is not running. In this case, the RC oscillator frequency of
±50% will also be valid for
the low prescaler frequency outputs.
Not
Recommended
for
New
Designs
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