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Appendix A summarizes the characteristics of the microprocessors in the M68000
Family. The M68000 user's manual includes more detailed information about the
MC68000 and MC68010 differences.
Data Bus Size (Bits)
Address Bus Size (Bits)
Instruction Cache
(in Words)
*Three-word cache for the loop mode
Virtual Memory/Machine
MC68000
MC68010
CPU32
MC68020
Coprocessor Interface
MC68000
MC68010
CPU32
MC68020
Word/Long-Word Data Alignment
MC68000
MC68010
CPU32
MC68020
Control Registers
MC68000
MC68010
CPU32
MC68020
CPU32
REFERENCE MANUAL
APPENDIX A
M68000 FAMILY SUMMARY
MC68000
MC68010
1 6
24
—
None
Bus Error Detection, Instruction Continuation
Bus Error Detection, Instruction Restart
Bus Error Detection, Instruction Continuation
Emulated in Software
Emulated in Software
Emulated in Software
In Microcode
Word/Long-Word Data, Instructions, and Stack Must Be Word
Aligned
Word/Long-Word Data, Instructions, and Stack Must Be Word
Aligned
Word/Long-Word Data, Instructions, and Stack Must Be Word
Aligned
Only Instructions Must Be Word Aligned (Data Alignment Im-
proves Performance)
None
SFC, DFC, VBR
SFC, DFC, VBR
SFC, DFC, VBR, CACR, CAAR
M68000 FAMILY SUMMARY
CPU32
1 6
8, 16
24
24
3*
3*
MC68020
8, 16, 32
32
128
MOTOROLA
A-1
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