參數(shù)資料
型號: SC16C654BIBS,557
廠商: NXP Semiconductors
文件頁數(shù): 31/58頁
文件大?。?/td> 0K
描述: IC QUAD UART 64BYTE 48HVQFN
標準包裝: 2,450
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:
帶調制解調器控制功能:
帶CMOS:
安裝類型: 表面貼裝
封裝/外殼: 48-VFQFN 裸露焊盤
供應商設備封裝: 48-HVQFN EP(6x6)
包裝: 托盤
其它名稱: 935279073557
SC16C654BIBS
SC16C654BIBS-ND
37
7674F–AVR–09/09
ATmega164P/324P/644P
7.7
128 kHz Internal Oscillator
The 128 kHz internal Oscillator is a low power Oscillator providing a clock of 128 kHz. The fre-
quency is nominal at 3V and 25
° C. This clock may be select as the system clock by
programming the CKSEL Fuses to “0011” as shown in Table 7-12.
Note:
1. The frequency is preliminary value. Actual value is TBD.
When this clock source is selected, start-up times are determined by the SUT Fuses as shown in
7.8
External Clock
To drive the device from an external clock source, XTAL1 should be driven as shown in Figure
7-4. To run the device on an external clock, the CKSEL Fuses must be programmed to “0000”.
Figure 7-4.
External Clock Drive Configuration
When this clock source is selected, start-up times are determined by the SUT Fuses as shown in
Table 7-12.
128 kHz Internal Oscillator Operating Modes
Nominal Frequency
CKSEL3..0
128 kHz
0011
Table 7-13.
Start-up Times for the 128 kHz Internal Oscillator
Power Conditions
Start-up Time from
Power-down and Power-save
Additional Delay from
Reset
SUT1..0
BOD enabled
6 CK
14CK
00
Fast rising power
6 CK
14CK + 4 ms
01
Slowly rising power
6 CK
14CK + 64 ms
10
Reserved
11
Table 7-14.
Crystal Oscillator Clock Frequency
Nominal Frequency
CKSEL3..0
0 - 20 kHz
0000
NC
EXTERNAL
CLOCK
SIGNAL
XTAL2
XTAL1
GND
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