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Lab 1 - Introduction This lab experiment is intended to...

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Introduction This lab experiment is intended to familiarize us with the lab equipment and basic programming and debugging operations of the Dragon12 microcontroller card via a Windows PC running MiniIDE. Equipment Dragon12 Microcontroller and 9V DC transformer Windows 95 PC or newer, or Mac OS X running Windows 95 or newer MiniIDE 9-pin D-connector serial cable Serial port or USB-serial adapter Procedure We entered a small program that amounted to this: org $2020 LDAA $2100 ADDA $2101 STAA $2029 SWI org $2100 FCB $80 FCB $80 Results What this program does is loads 80 h into accumulator A from memory location 2100 h , then adds 80 h from memory location 2101 h to accumulator A, and finally, it stores accumulator A into memory location 2029 h . The result is that memory location 2029 h and accumulator A hold the value 00 h and the CCR bits have changed. Why is the result 00 h ? The result is 00 h because 80 h + 80 h = 100 h . A single byte is not large enough to represent 100 h without carrying into an additional byte. So the result you get overflows and becomes 00
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