The advantage to using this module is that it

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Unformatted text preview: r doing other things. The CCP module only requires that the developer configure the parameters of the module. Configuring the module includes setting the frequency and duty cycle registers. 2010 Microchip Technology Inc. The ECCP module (short for Enhanced Capture Compare and PWM) provides the same functionality as the CCP module with the added capability of driving a full or half-bridge circuit. The ECCP module also has auto-shutdown capability and programmable dead band delay. Note: Microchip Application Note AN893 gives a detailed explanation of configuring the ECCP module for driving a BDC motor. The application note also includes firmware and drive circuit examples. FEEDBACK MECHANISMS Though the speed of a BDC motor is generally proportional to duty cycle, no motor is ideal. Heat, commutator wear and load all affect the speed of a motor. In systems where precise speed control is required, it is a good idea to include some sort of feedback mechanism in the system. Speed feedback is implemented in one of two ways. The first involves the use of a speed sensor of some kind. The second uses the BEMF...
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