参数资料
型号: 101-1218
厂商: Rabbit Semiconductor
文件页数: 75/130页
文件大小: 0K
描述: KIT APPLCTN RABBITCORE RCM4010
标准包装: 1
系列: RabbitCore®
主要目的: *
嵌入式: *
已用 IC / 零件: RCM4010
主要属性: *
次要属性: *
已供物品: 板,模块,250GB 网络驱动器,线缆,CD,电源
其它名称: 316-1156
User’s Manual
43
4.5 Other Hardware
4.5.1 Clock Doubler
The RCM4000 takes advantage of the Rabbit 4000 microprocessor’s internal clock doubler.
A built-in clock doubler allows half-frequency crystals to be used to reduce radiated
emissions. The 58.98 MHz frequency specified for the RCM4000 is generated using a
29.49 MHz crystal.
The clock doubler may be disabled if 58.98 MHz clock speeds are not required. Disabling
the Rabbit 4000 microprocessor’s internal clock doubler will reduce power consumption
and further reduce radiated emissions. The clock doubler is disabled with a simple config-
uration macro as shown below.
4.5.2 Spectrum Spreader
The Rabbit 4000 features a spectrum spreader, which helps to mitigate EMI problems. The
spectrum spreader is on by default, but it may also be turned off or set to a stronger setting.
The means for doing so is through a simple configuration macro as shown below.
NOTE: Refer to the Rabbit 4000 Microprocessor User’s Manual for more information
on the spectrum-spreading setting and the maximum clock speed.
1. Select the “Defines” tab from the Dynamic C Options > Project Options menu.
2. Add the line CLOCK_DOUBLED=0 to always disable the clock doubler.
The clock doubler is enabled by default, and usually no entry is needed. If you need to
specify that the clock doubler is always enabled, add the line CLOCK_DOUBLED=1 to
always enable the clock doubler.
3. Click OK to save the macro. The clock doubler will now remain off whenever you are
in the project file where you defined the macro.
1. Select the “Defines” tab from the Dynamic C Options > Project Options menu.
2. Normal spreading is the default, and usually no entry is needed. If you need to specify
normal spreading, add the line
ENABLE_SPREADER=1
For strong spreading, add the line
ENABLE_SPREADER=2
To disable the spectrum spreader, add the line
ENABLE_SPREADER=0
NOTE: The strong spectrum-spreading setting is not recommended since it may limit
the maximum clock speed or the maximum baud rate. It is unlikely that the strong set-
ting will be used in a real application.
3. Click OK to save the macro. The clock doubler will now remain off whenever you are
in the project file where you defined the macro.
相关PDF资料
PDF描述
0982660995 CBL 29POS 0.5MM JMPR TYPE A 5"
1812R-103J INDUCTOR UNSHIELDED 10UH SMD
0982660994 CBL 29POS 0.5MM JMPR TYPE D 5"
1812R-102J INDUCTOR UNSHIELDED 1.0UH SMD
CDMC6D28NP-1R0MC POWER INDUCTOR 1.0UH SHIELD SMD
相关代理商/技术参数
参数描述
10-11-2183 功能描述:集管和线壳 18P CRIMP RAMP HSNG RoHS:否 产品种类:1.0MM Rectangular Connectors 产品类型:Headers - Pin Strip 系列:DF50 触点类型:Pin (Male) 节距:1 mm 位置/触点数量:16 排数:1 安装风格:SMD/SMT 安装角:Right 端接类型:Solder 外壳材料:Liquid Crystal Polymer (LCP) 触点材料:Brass 触点电镀:Gold 制造商:Hirose Connector
10-11-2184 制造商:MOLEX 制造商全称:Molex Electronics Ltd. 功能描述:2.54mm (.100") Pitch KK?? Crimp Terminal Housing, High Pressure, 1 Circuits
10-11-2193 功能描述:集管和线壳 KK 100 Housing Crimp Ramp 19 Ckt RoHS:否 产品种类:1.0MM Rectangular Connectors 产品类型:Headers - Pin Strip 系列:DF50 触点类型:Pin (Male) 节距:1 mm 位置/触点数量:16 排数:1 安装风格:SMD/SMT 安装角:Right 端接类型:Solder 外壳材料:Liquid Crystal Polymer (LCP) 触点材料:Brass 触点电镀:Gold 制造商:Hirose Connector
10-11-2194 功能描述:集管和线壳 KK 100 Housing Crimp Pol Ramp 19 Ckt RoHS:否 产品种类:1.0MM Rectangular Connectors 产品类型:Headers - Pin Strip 系列:DF50 触点类型:Pin (Male) 节距:1 mm 位置/触点数量:16 排数:1 安装风格:SMD/SMT 安装角:Right 端接类型:Solder 外壳材料:Liquid Crystal Polymer (LCP) 触点材料:Brass 触点电镀:Gold 制造商:Hirose Connector
10-11-2203 功能描述:集管和线壳 20 CKT CRIMP RAMP HOUSING RoHS:否 产品种类:1.0MM Rectangular Connectors 产品类型:Headers - Pin Strip 系列:DF50 触点类型:Pin (Male) 节距:1 mm 位置/触点数量:16 排数:1 安装风格:SMD/SMT 安装角:Right 端接类型:Solder 外壳材料:Liquid Crystal Polymer (LCP) 触点材料:Brass 触点电镀:Gold 制造商:Hirose Connector