參數(shù)資料
型號: 20-101-0654
廠商: Rabbit Semiconductor
文件頁數(shù): 32/110頁
文件大小: 0K
描述: INTERFACE OP6800 512K FLASH&SRAM
標(biāo)準(zhǔn)包裝: 1
系列: SBC
模塊/板類型: 單板計算機(jī)模塊
適用于相關(guān)產(chǎn)品: OP6800
其它名稱: 20-101-654
20-101-654-ND
24
MiniCom (OP6800)
3.5 Other Hardware
3.5.1 Clock Doubler
The OP6800 takes advantage of the Rabbit 2000 microprocessor’s internal clock doubler.
A built-in clock doubler allows half-frequency crystals to be used to reduce radiated emis-
sions. The 22.1 MHz frequency is generated using an 11.0592 MHz crystal. The clock
doubler is disabled automatically in the BIOS for crystals with a frequency above
12.9 MHz.
The clock doubler may be disabled if 22.1 MHz clock speeds are not required. Disabling
the Rabbit 2000 microprocessor’s internal clock doubler will reduce power consumption
and further reduce radiated emissions. The clock doubler is disabled with a simple global
macro as shown below.
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. The clock speed will be doubled as long as the crystal frequency is
less than or equal to 26.7264 MHz.
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.
相關(guān)PDF資料
PDF描述
20-101-0788 COMPUTER SGL-BOARD OP6600 W/SRAM
20-101-1068 MODULE RABBITCORE RCM3315
20-101-1131 MODULE RCM4200 RABBITCORE
20-101-1139 RCM4310 RABBITCORE
20-101-1154 MODULE RCM4120 RABBITCORE
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