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8051 I/O Port Programming using KEIL C with AT89S52 simulation on Proteus 8 and Prototyping Board – DIY Electronics Projects
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AT89S52-24PU | Atmel 8051 CISC Hochleistungs-CMOS-Mikrocontroller mit geringer Leistungsaufnahme 8bit 8kB PDIP | Distrelec Deutschland
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