参数资料
型号: 101-0521
厂商: Rabbit Semiconductor
文件页数: 75/138页
文件大小: 0K
描述: MODULE RABBITCORE RCM3210
标准包装: 1
系列: RabbitCore®
模块/板类型: MPU 核心模块
适用于相关产品: RCM3210
其它名称: 101-521
101-521-ND
User’s Manual
35
4.4 Other Hardware
4.4.1 Clock Doubler
The RCM3200 takes advantage of the Rabbit 3000 microprocessor’s internal clock doubler.
A built-in clock doubler allows half-frequency crystals to be used to reduce radiated emis-
sions. The 44.2 MHz frequency specified for the RCM3200 and the RCM3220 is gener-
ated using a 22.12 MHz resonator.
The clock doubler may be disabled if 44.2 MHz clock speeds are not required. Disabling
the Rabbit 3000 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.
4.4.2 Spectrum Spreader
The Rabbit 3000 features a spectrum spreader, which helps to mitigate EMI problems. By
default, the spectrum spreader is on automatically, 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 3000 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 unnecessary for the RCM3200.
3. Click OK to save the macro. The spectrum spreader will now be set to the state specified
by the macro value whenever you are in the project file where you defined the macro.
相关PDF资料
PDF描述
101-0525 COMPUTER SINGLE-BOARD LP3500 FOX
101-0602 COMPUTER SNGL BRD BL2500 44.2MHZ
101-0673 MODULE RABBITCORE RCM3610
101-0814 COMPUTER SNG BD BL1810 512K SRAM
101-1007 MODULE POWERCORE FLEX 3810
相关代理商/技术参数
参数描述
101-0522 功能描述:模块化系统 - SOM MICRO-CNTLR DAUG/BD RoHS:否 制造商:Digi International 外观尺寸:ConnectCore 9P 处理器类型:ARM926EJ-S 频率:150 MHz 存储容量:8 MB, 16 MB 存储类型:NOR Flash, SDRAM 接口类型:I2C, SPI, UART 工作电源电压:3.3 V 最大工作温度:+ 85 C 尺寸:1.97 in x 1.97 in x 6.1 in
10-105220-25P 制造商:Amphenol Aerospace 功能描述:RECEPT
10-105220-25S 制造商:Amphenol Aerospace 功能描述:RECEPT
10-105220-26P 制造商:Amphenol Aerospace 功能描述:RECEPT
10-105220-26S 制造商:Amphenol Aerospace 功能描述:RECEPT