参数资料
型号: SC28L92A1B,528
厂商: NXP Semiconductors
文件页数: 25/73页
文件大小: 0K
描述: IC UART DUAL W/FIFO 44PQFP
标准包装: 1,500
系列: IMPACT
特点: 故障启动位检测
通道数: 2,DUART
FIFO's: 16 字节
电源电压: 3.3V,5V
带自动流量控制功能:
带故障启动位检测功能:
带调制解调器控制功能:
带CMOS:
安装类型: 表面贴装
封装/外壳: 44-QFP
供应商设备封装: 44-PQFP(10x10)
包装: 带卷 (TR)
其它名称: 935263294528
SC28L92A1B-T
SC28L92A1B-T-ND
31
2552K–AVR–04/11
ATmega329/3290/649/6490
8.6
External Clock
To drive the device from an external clock source, XTAL1 should be driven as shown in Figure
8-3. To run the device on an external clock, the CKSEL Fuses must be programmed to “0000”.
Figure 8-3.
External Clock Drive Configuration
When this clock source is selected, start-up times are determined by the SUT Fuses as shown in
When applying an external clock, it is required to avoid sudden changes in the applied clock fre-
quency to ensure stable operation of the MCU. A variation in frequency of more than 2% from
one clock cycle to the next can lead to unpredictable behavior. It is required to ensure that the
MCU is kept in Reset during such changes in the clock frequency.
Note that the System Clock Prescaler can be used to implement run-time changes of the internal
clock frequency while still ensuring stable operation. Refer to “System Clock Prescaler” on page
32 for details.
8.7
Clock Output Buffer
When the CKOUT Fuse is programmed, the system Clock will be output on CLKO. This mode is
suitable when the chip clock is used to drive other circuits on the system. The clock will be out-
put also during reset and the normal operation of I/O pin will be overridden when the fuse is
programmed. Any clock source, including internal RC Oscillator, can be selected when CLKO
Table 8-9.
Crystal Oscillator Clock Frequency
CKSEL3..0
Frequency Range
0000
0 - 16MHz
Table 8-10.
Start-up Times for the External Clock Selection
SUT1..0
Start-up Time from Power-
down and Power-save
Additional Delay from
Reset (V
CC = 5.0V)
Recommended Usage
00
6 CK
14CK
BOD enabled
01
6 CK
14CK + 4.1ms
Fast rising power
10
6 CK
14CK + 65ms
Slowly rising power
11
Reserved
NC
EXTERNAL
CLOCK
SIGNAL
XTAL2
XTAL1
GND
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