参数资料
型号: ATF16V8B-10JU
厂商: Atmel
文件页数: 19/26页
文件大小: 0K
描述: IC PLD 10NS 20PLCC
标准包装: 48
系列: 16V8
可编程类型: EE PLD
宏单元数: 8
输入电压: 5V
速度: 10ns
安装类型: 表面贴装
封装/外壳: 20-LCC(J 形引线)
供应商设备封装: 20-PLCC
包装: 管件
产品目录页面: 610 (CN2011-ZH PDF)
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
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