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AC23 Microprocessor Based System Design  TYPICAL QUESTI !S " A!S#E$S PA$T % I B&ECTI'E TYPE QUESTI!S Eac( Q)estion carries 2 mar*s+ C(oose t(e correct or ,est a-ternati.e in t(e /o--o0ing1 Q+ If the crystal oscillator is operating at 15 MHz, the PCLK output of 8284 is A4 25 MHz B4 5 MHz C4 !5 MHz D4 1" MHz Ans1 #$% Q+2 In &hich '(state )oes the CP* sen)s the a))ress to +e+ory or I- an) the $L. signal for )e+ultiple/ing A4 '1 B4 '2 C4 '0 D4 '4 Ans, uring the first clocing perio) in a 3us cycle, &hich is calle) '1, the a))ress of the +e+ory or I- location is sent out an) the control signals $L., ' an) I-M are also output Hence ans&er is #$% Q+3 If a 1M ×1 $M re6uires 4 +s for a refresh an) has 257 ro&s to 3e refreshe), no +ore than of ti+e +ust pass 3efore another ro& is refreshe) A4 74 +s B4 4 ns C4 "5 ns D4 15725 µs Ans $ns&er is #9% Q+5 In a M$ &rite operation the )ata is transferre) A4 fro+ I- to +e+ory B4 fro+ +e+ory to I- C4 fro+ +e+ory to +e+ory D4 fro+ I- to I- Ans $ M$ &rites operation transfers )ata fro+ an I- )e:ice to +e+ory Hence ans&er is #$% Q+6 ;hich type of <MP instruction asse+3les if the )istance is ""2" h 3ytes A4 near B4 far C4 short D4 none of the a3o:e Ans 'he three 3yte near =u+p allo&s a 3ranch or =u+p &ithin > 02K 3ytes Hence ans&er is #$% Q+7 $ certain ?$M has C? = " , ;. = " an) -. = 1 In &hich of the follo&ing +o)es this ?$M is operating A4 ea) B4 ;rite 1

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