- 您现在的位置：买卖IC网 > PDF目录79605 > IR83C154TXXX-20 (ATMEL CORP) 8-BIT, MROM, 20 MHz, MICROCONTROLLER, CQCC44 PDF资料下载
参数资料
| 型号： | IR83C154TXXX-20 |
| 厂商： | ATMEL CORP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 20 MHz, MICROCONTROLLER, CQCC44 |
| 封装： | LCC-44 |
| 文件页数： | 14/91页 |
| 文件大小： | 19688K |
| 代理商： | IR83C154TXXX-20 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页当前第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页第91页
26
7707F–AVR–11/10
AT90USB82/162
6.1.4
USB Clock – clk
USB
The USB is provided with a dedicated clock domain. This clock is generated with an on-chip PLL
running at 48MHz. The PLL always multiply its input frequency by 6. Thus the PLL clock register
should be programmed by software to generate a 8MHz clock on the PLL input.
6.2
Clock Switch
In the AT90USB82/162 product, the Clock Multiplexer and the System Clock Prescaler can be
modified by software.
6.2.1
Exemple of use
The modification can occur when the device enters in USB Suspend mode. It then switches from
External Clock to Calibrated RC Oscillator in order to reduce consumption. In such a configura-
tion, the External Clock is disabled.
The firmware can use the watchdog timer to be woken-up from power-down in order to check if
there is an event on the application.
If an event occurs on the application or if the USB controller signals a non-idle state on the USB
line (Resume for example), the firmware switches the Clock Multiplexer from the Calibrated RC
Oscillator to the External Clock.
Figure 6-2.
Example of clock switching with wake-up from USB Host
USB
CPU Clock
External
Oscillator
RC oscillator
Ext
RC
Ext
non-Idle
Idle
(Suspend)
non-Idle
3m
s
resume
1
1 Resume from Host
watchdog wake-up
from power-down
相关PDF资料 |
PDF描述 |
|---|---|
| IF283C154XXX-20R | 8-BIT, MROM, 20 MHz, MICROCONTROLLER, PQFP44 |
| IP83C154DTXXX-20D | 8-BIT, MROM, 20 MHz, MICROCONTROLLER, PDIP40 |
| ID83C154DXXX-20 | 8-BIT, MROM, 20 MHz, MICROCONTROLLER, CDIP40 |
| IF183C154DTXXX-20 | 8-BIT, MROM, 20 MHz, MICROCONTROLLER, PQFP44 |
| IS83C154TXXX-25R | 8-BIT, MROM, 25 MHz, MICROCONTROLLER, PQCC44 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| IR8400P | 制造商:IRF 制造商全称:International Rectifier 功能描述:QUAD HIGH SIDE SWITCH |
| IR860 | 制造商:Xytronic Industries 功能描述:650W SMD/BGA Complete Infrared Rework Station |
| IR-880 | 制造商:BOWEI 制造商全称:BOWEI 功能描述:Image Rejection Mixers |
| IR-8818H | 制造商:UNBRANDED 功能描述:THERMOMETER INFRARED |
| IR-8828H | 制造商:UNBRANDED 功能描述:THERMOMETER INFRARED |
发布紧急采购，3分钟左右您将得到回复。