參數(shù)資料
型號(hào): XE8807AMI026TLF
廠商: Semtech
文件頁數(shù): 88/143頁
文件大?。?/td> 0K
描述: IC MCU LOW PWR MTP FLASH 32-TQFP
標(biāo)準(zhǔn)包裝: 1
系列: XE880x
應(yīng)用: 感測(cè)機(jī)
核心處理器: Coolrisc816?
程序存儲(chǔ)器類型: 閃存(11 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: 32-TQFP
包裝: 標(biāo)準(zhǔn)包裝
供應(yīng)商設(shè)備封裝: 32-TQFP(7x7)
產(chǎn)品目錄頁面: 585 (CN2011-ZH PDF)
配用: XE8000MP-ND - PROG BOARD AND PROSTART2 CARD
其它名稱: XE8807AMI026DKR
Semtech 2006
www.semtech.com
7-10
XE8806A/XE8807A
7.11
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
±35% will also be valid for
the low prescaler frequency outputs.
The next table shows how the RC trimming values in the RegSysRcTrim1 and RegSysRcTrim2 registers select
the 32 kHz frequency. The least significant bits of the RcFreqFine word are not used.
In order to ensure the correct frequency selection for the low prescaler when having an external clock, a proper
value must be set in the RC trim registers. The code can be selected from the table below as a function of the
frequency ratio between half the frequency of the external clock and 32kHz. If the frequency is not set correctly, all
timings derived from the low prescaler will be shifted accordingly (e.g. watchdog frequencies) and some
peripherals may no longer function correctly if the deviation from 32kHz is too large (e.g. the voltage level
detector).
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