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MICROPROCESSOR INSTRUCTION REFERENCE->DBPL
DBPL Decrement and Branch until Plus or Count = -1
Compatibility: 68000, 68010, 68020, CPU32 families
If N = 1 then Decrement data register Dn (low order word) and Branch if result not -1
| where | . = Boolean AND |
| + = Boolean OR | |
| ' = Complement |