chap.3.assemblylang.ps

嵌入开发笔记 用ps阅读器打开

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%%EndProlog

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3046(used)X
3247(to)X
3347(hold)X
3543(copies)X
3814(of)X
3919(data)X
4104(from)X
920 1419(the)N
1062(memory.)X
1432(It)X
1516(is)X
1605(these)X
1828(copies)X
2099(that)X
2269(may)X
2460(be)X
2576(operated)X
2933(upon)X
3150(by)X
3271(the)X
3414(instructions.)X
3912(Each)X
4130(data)X
920 1531(register)N
1233(is)X
1321(32-bits)X
1612(in)X
1711(length.)X
776 1671(2.)N
920(Because)X
1283(instructions)X
1774(must)X
2003(be)X
2136(stored)X
2413(in)X
2530(memory,)X
2917(the)X
3077(CPU)X
3306(must)X
3536(have)X
3761(some)X
4007(idea)X
4211(of)X
920 1783(where)N
1192(the)X
1347(next)X
1550(instruction)X
1999(\(to)X
2143(execute\))X
2507(is.)X
2632(This)X
2840(``address'')X
3292(is)X
3392(stored)X
3663(in)X
3774(the)X
3 f
3928(program)X
920 1895(counter)N
1 f
1268(register)X
1590(\(PC\).)X
1828(The)X
2011(PC)X
2161(is)X
2258(32)X
2387(bits)X
2559(in)X
2667(length.)X
2965(Normally,)X
3392(the)X
3544(program)X
3904(counter)X
4227(is)X
920 2007(incremented)N
1429(by)X
1557(one)X
1728(after)X
1937(each)X
2146(instruction.)X
2614(I.e.,)X
2792(the)X
2941(next)X
3138(instruction)X
3581(to)X
3687(execute)X
4013(usually)X
920 2119(immediately)N
1456(follows)X
1797(the)X
1968(current)X
2295(one)X
2488(being)X
2756(executed.)X
3177(This)X
3402(is)X
3520(what)X
3761(is)X
3879(commonly)X
920 2231(referred)N
1272(to)X
1394(as)X
2 f
1521(sequential)X
1 f
1964(instruction)X
2423(execution.)X
2869(We)X
3050(will)X
3247(discuss)X
3570(ways)X
3813(to)X
3934(alter)X
4152(this)X
920 2343(sequential)N
1335(behavior)X
1696(later.)X
776 2483(3.)N
920(The)X
1100(third)X
1313(class)X
1531(of)X
1642(register)X
1962(is)X
2057(one)X
2227(which)X
2493(saves)X
2732(information)X
3218(about)X
3463(``special'')X
3890(conditions)X
920 2595(that)N
1090(may)X
1281(arise)X
1488(during)X
1764(the)X
1907(execution)X
2307(of)X
2412(an)X
2528(instruction.)X
2989(In)X
3094(the)X
3236(M68000,)X
3609(we)X
3745(call)X
3909(this)X
4072(regis-)X
920 2707(ter)N
1051(the)X
3 f
1198(condition)X
1611(code)X
1827(register)X
1 f
2173(\(CCR\),)X
2483(and)X
2652(it)X
2736(consists)X
3070(of)X
3180(5)X
3258(bits,)X