This note provides basic implementation details and procedural information to design and assemble a stepper motor system. The controller discussed here is the MC68HC11E9, an 8-bit Motorola microcontroller (MCU). There are many embedded control applications supported by the M68HC11 Family.The note consists of a general des cription and gives highlights of implementing a basic stepper motor system application. A step-by-step hardware assembly section is included to promote ease of construction should one desire to build a similar system.To simplify the application, the software was generated on the Motorola M68HC11EVM evaluation module (EVM). The program created with the EVM is shown in 6 Listing. The program runs in addresses $C000 through $C1CC. It is meant to be used as a guide and can be modified to support a variety of stepper motor control applications. Some modules will require no changes for use. For convenience, a copy of the code is available through Freeware Data Services. The Freeware BBS can be accessed by modem at (512) 891-3733, or via the World Wide Web at http://freeware.sps.mot.com.
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