參數(shù)資料
型號: XE8801AMI027LF
廠商: Semtech
文件頁數(shù): 80/135頁
文件大小: 0K
描述: IC DAS 16BIT FLASH 8K MTP 44LQFP
標準包裝: 800
系列: XE880x
應用: 感測機
核心處理器: Coolrisc816?
程序存儲器類型: 閃存(22 kB)
控制器系列: XE8000
RAM 容量: 512 x 8
接口: UART,USRT
輸入/輸出數(shù): 24
電源電壓: 2.4 V ~ 5.5 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 44-VFQFN 裸露焊盤
包裝: 托盤
供應商設備封裝: 44-MLPQ(7x7)
產(chǎn)品目錄頁面: 585 (CN2011-ZH PDF)
配用: XE8000MP-ND - PROG BOARD AND PROSTART2 CARD
Semtech 2005
www.semtech.com
7-9
XE8801A – SX8801R
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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