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Coyote (BL2500)

3.7 Other Hardware

3.7.1 Clock Doubler

The Coyote 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

emissions. The 29.4 MHz frequency specified for the Coyote is generated using a

14.7456 MHz crystal. The clock doubler will not work for crystals with a frequency

above 26.7264 MHz.

The clock doubler may be disabled if 29.4 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.

NOTE: Disabling the clock doubler will degrade the A/D and D/A conversion.

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.

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10105D	制造商:MISCELLANEOUS 功能描述:
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10105N	制造商:NXP Semiconductors 功能描述:
10105NA	制造商:NXP Semiconductors 功能描述:
10106	功能描述:WIRE STRIPPER AWG 10-30 RoHS:否類別:工具 >> 剝線器和配件系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類型:- 纜線類型:16~26 AWG 特點(diǎn):-

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