參數(shù)資料
型號: SC16C654BIBM,128
廠商: NXP Semiconductors
文件頁數(shù): 26/58頁
文件大小: 0K
描述: IC QUAD UART 64BYTE 64LQFP
標(biāo)準(zhǔn)包裝: 2,000
特點: 故障啟動位檢測
通道數(shù): 4,QUART
FIFO's: 64 字節(jié)
電源電壓: 2.5V,3.3V,5V
帶自動流量控制功能:
帶IrDA 編碼器/解碼器:
帶故障啟動位檢測功能:
帶調(diào)制解調(diào)器控制功能:
帶CMOS:
安裝類型: 表面貼裝
封裝/外殼: 64-LQFP
供應(yīng)商設(shè)備封裝: 64-LQFP(7x7)
包裝: 帶卷 (TR)
其它名稱: 935279068128
SC16C654BIBM-F
SC16C654BIBM-F-ND
32
7674F–AVR–09/09
ATmega164P/324P/644P
Figure 7-2.
Crystal Oscillator Connections
7.3
Low Power Crystal Oscillator
This Crystal Oscillator is a low power oscillator, with reduced voltage swing on the XTAL2 out-
put. It gives the lowest power consumption, but is not capable of driving other clock inputs, and
may be more susceptible to noise in noisy environments. In these cases, refer to the “Full Swing
Some initial guidelines for choosing capacitors for use with crystals are given in Table 7-3. The
crystal should be connected as described in “Clock Source Connections” on page 31.
The Low Power Oscillator can operate in three different modes, each optimized for a specific fre-
quency range. The operating mode is selected by the fuses CKSEL3..1 as shown in Table 7-3.
Notes:
1. The frequency ranges are preliminary values. Actual values are TBD.
2. This option should not be used with crystals, only with ceramic resonators.
3. If 8 MHz frequency exceeds the specification of the device (depends on V
CC), the CKDIV8
Fuse can be programmed in order to divide the internal frequency by 8. It must be ensured
that the resulting divided clock meets the frequency specification of the device.
The CKSEL0 Fuse together with the SUT1..0 Fuses select the start-up times as shown in Table
XTAL2
XTAL1
GND
C2
C1
Table 7-3.
Low Power Crystal Oscillator Operating Modes
Frequency Range(1) (MHz)
CKSEL3..1
Recommended Range for Capacitors C1
and C2 (pF)
0.4 - 0.9
100(2)
0.9 - 3.0
101
12 - 22
3.0 - 8.0
110
12 - 22
8.0 - 16.0
111
12 - 22
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