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Motorola 68hc11 Microcontroller Architecture Pdf Download
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Motorola 68hc11 Microcontroller Architecture Pdf Download
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In,the,48,pin,DIP,package,38,pins,are,available,for,I/O,functions.(34,I/O,lines+,2,interrupt,lines,+,2,hand,shake,control,lines).,If,,the,,watchdog,,timer,,times,,out,,,it,,is,,an,,indication,,that,,software,,is,,no,,longer,,being,,executed,,in,,the,,intended,,sequence;,,thus,,,a,,system,,reset,,is,,initiated.External,,Reset:,,External,,Reset,,In,,addition,,to,,the,,internal,,sources,,,reset,,can,,be,,forced,,by,,applying,,a,,low,,level,,to,,the,,RESET,,pin.,,The,,Freescale,,68HC12,,microcontroller,,family,,is,,an,,enhanced,,16-bit,,version,,of,,the,,68HC11.,,Up,,,to,,,10MIPS,,,Throughput,,,at,,,10MHz,,,256,,,Bytes,,,of,,,RAM,,,,,,,512,,,Bytes,,,of,,,In-System,,,Programmable,,,EEPROM,,,and,,,Programming,,,Lock.,,,They,,,normally,,,used,,,to,,,hold,,,addresses,,,of,,,16-bit,,,memory,,,locations.These,,,registers,,,are,,,also,,,,,,,some,,,times,,,used,,,for,,,them,,,for,,,16-bit,,,computation,,,also.,,,Contd.:,Contd.,At,reset,,the,SCI,baud,rate,is,indeterminate,and,must,be,established,by,a,software,write,to,the,BAUD,register.,Eight,channel,8-bit,Analog,to,Digital,Convertor,One,serial,peripheral,interface,,with,a,speed,up,to,1M,Contd:,Contd,,The,MC68HC11,is,available,in,two,packages,.,They,,,are,,,Port,,,A,,,,,,,Port,,,B,,,,,,,Port,,,C,,,,Port,,,D,,,and,,,Port,,,E,,,Port,,,A,,,(8,,,bits),,,1,,,bidirectional,,,pin,,,,4,,,output,,,pins,,,,3,,,input,,,pins,,,,,,,Also,,,used,,,for,,,timer,,,Port,,,B,,,(8,,,bits),,,8,,,output,,,pins,,,with,,,optional,,,handshaking,,,,,,,Also,,,used,,,as,,,address,,,in,,,expanded,,,mode,,,(replaced,,,by,,,PRU),,,Contd.:,,,Contd.,,,D,,series,,-,,economical,,alternative,,,less,,memory,,,peripherals.,,
On,,,power,,,up,,,or,,,reset,,,,the,,,program,,,in,,,the,,,bootstrap,,,ROM,,,is,,,executed,,,ii.CPU,,,waits,,,for,,,a,,,256-byte,,,program,,,segment,,,to,,,be,,,downloaded,,,through,,,the,,,serial,,,link,,,and,,,stored,,,starting,,,at,,,address,,,#0000,,,iii.Execution,,,then,,,begins,,,at,,,address,,,$0000,,,iv.Permits,,,wide,,,variety,,,of,,,programs,,,to,,,be,,,downloaded,,,Test,,,Mode,,,(MODA=1,,,,MODB=0),,,:,,,Test,,,Mode,,,(MODA=1,,,,MODB=0),,,i.Primarily,,,used,,,to,,,test,,,the,,,chip,,,by,,,the,,,manufacturer,,,ii.,,,Views:,8463,,Category:,Science,&,Tech.,After,,,any,,,reset,,,,X,,,is,,,set,,,by,,,default,,,and,,,can,,,be,,,cleared,,,only,,,by,,,a,,,software,,,instructionAddressing,,,Modes:,,,Addressing,,,Modes,,,Addressing,,,modes,,,are,,,used,,,to,,,specify,,,the,,,operands,,,needed,,,in,,,an,,,instruction.,,,Exs,,,:,,,ABA,,,;,,,adds,,,the,,,contents,,,of,,,accumulator,,,B,,,to,,,accumulator,,,A.,,,It,,is,,a,,CISC,,microcontroller,,,,,optimized,,for,,low,,power,,consumption,,and,,high-performance,,operation,,at,,bus,,frequencies,,up,,to,,4,,MHz,,.,,The,,COP,,watch,,dog,,timer,,will,,always,,provide,,protection,,from,,any,,malfunction.,,A,,,timer,,,overflow,,,function,,,allows,,,software,,,to,,,extend,,,the,,,timing,,,capability,,,of,,,the,,,system,,,beyond,,,the,,,16-bit,,,range,,,of,,,the,,,counter.,,,
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by Leldenh on 2016-08-31 09:17:59
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