參數(shù)資料
型號： XE8805AMI028LF
廠商： Semtech
文件頁數(shù)： 97/156頁
文件大?。?/td> 0K
描述： IC DAS 16BIT FLASH 8K MTP 64LQFP
標(biāo)準(zhǔn)包裝： 160
系列： XE880x
應(yīng)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： 64-LQFP
包裝： 托盤
供應(yīng)商設(shè)備封裝： 64-LQFP（10x10）
產(chǎn)品目錄頁面： 585 (CN2011-ZH PDF)
配用： XE8000MP-ND - PROG BOARD AND PROSTART2 CARD
Semtech 2006
www.semtech.com
7-4
XE8805/05A
7.5
Clock sources
7.5.1
RC oscillator
7.5.1.1
Configuration
The RC oscillator is always turned on and selected for CPU and system operation at power-on reset and when
exiting sleep mode. It can be turned off after the Xtal (quartz oscillator) has been started, after selection of the
external clock or by entering sleep mode.
The RC oscillator has two frequency ranges: sub-MHz (100 kHz to 1 MHz) and above-MHz (1 MHz to 10 MHz).
Inside a range, the frequency can be tuned by software for coarse and fine adjustment. See registers
RegSysRcTrim1 and RegSysRcTrim2.
Bit EnableRC in register RegSysClock controls the propagation of the RC clock signal and the operation of the
oscillator. The user can stop the RC oscillator by resetting the bit EnableRC. Entering the sleep mode disables the
RC oscillator.
Note: Before turning off the RC oscillator, the cpusel bit in RegSysClock must be set to one.
Note: The RC oscillator bias can be maintained while the oscillator is switched off by setting the bit BiasRc in
RegSysClock. This allows a faster restart of the RC oscillator at the cost of increased power consumption when
the oscillator is disabled (see section 7.5.1.3).
7.5.1.2
RC oscillator frequency tuning
The RC oscillator frequency can be set using the bits in the RegSysRcTrim1 and RegSysRcTrim2 registers.
Figure 7-2 shows the nominal frequency of the RC oscillator as a function of these bits. The absolute value of the
frequency for a given register content may change by
±50% from chip to chip due to the tolerances on the
integrated capacitors and resistors. However, the modification of the frequency as a function of a modification of
the register content is fairly precise for frequencies below 2MHz. This means that the curves in Figure 7-2 can shift
up and down but that the slope remains unchanged.
The bit RcFreqRange modifies the oscillator frequency by a factor of 10. The upper curve in the figure
corresponds to RcFreqRange=1.
The RcFreqCoarse modifies the frequency of the oscillator by a factor (RcFreqCoarse+1). The figure represents
the frequency for 5 different values of the bits RcFreqCoarse: for each value the frequency is multiplied by 2.
Incrementing the RcFreqFine code increases the frequency by about 1.4%.
The frequency of the oscillator is therefor given by:
fRC=fRcmin(1+9RcFreqRange)(1+RcFreqCoarse)(1.014)
RcFreqFine
with fRcmin the RC oscillator frequency if the registers are all 0. At higher frequencies, the frequency may deviate
from the value predicted by the equation.
Not
Recommended
for
New
Designs
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