Stan Kelly-Bootle's 68000, 68010, 68020 Primer PDF

By Stan Kelly-Bootle

ISBN-10: 0672224054

ISBN-13: 9780672224058

Publication by means of Kelly-Bootle, Stan, Fowler, Bob

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Ie must not lose sight of the average user, keying in data and printing pie charts. The system bus carries three kinds of signal traffic: data, address and control. In some computers these three sets of signals are electrically independent (separate wires). We call these multibus systems, since one can identify a data bus, an address bus, and a control bus. lJef systems may have 22 68000, 68010, and 68020 Primer a single bus that is shared among the three, using a technique known as multiplexing.

Although MPUs have evolved into myriad designs, there is a useful "generic" architecture that serves to describe them all. INSIDE THE MPU The first thing to notice in Figure 1-11 is that the microprocessor has three main connections to the "outside VJOrld," namely the paths to the data, address, and control busses. Note that it also has an internal bus (there can be several of these) connecting various functional units of the MPU. Within the MPU , in fact, control and data signals move along the internal bus, synchronized by the system clock - not unlike the picture we drew of the traffic on the system's bus.

Or it might be a full 8-bit ASCII graphics character or "private" control code. V()Uld be interpreted as part of an instruction. Vn peculiar coding schemes built into the MPU. You saw that the instruction decoder has to interpret this code before the MPU can execute il In Chapter 4 , you will see hovJ the M68000 instruction set is encoded into groups of 16-bit VJOrds. Ve have the basis for a very rich and varied set of different operations. Since the bytes we read from memory can mean so many different things, you may be VJOndering how the MPU distinguishes all these possible interpretations.

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68000, 68010, 68020 Primer by Stan Kelly-Bootle


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