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Why does the debug frame show some addresses as word-addresses and others as byte-addresses?

April 26, 2017addresses debug frame

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Why does the debug frame show some addresses as word-addresses and others as byte-addresses?

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The MAR stores a number that is a word address (not a word-aligned byte-address), and the PC stores a byte address. This is specified in Chapter 4, of Tanenbaum. When the MAR is expressed on the memory bus, it is at that point shifted by two bits.