Motorola M68000 User Manual Page 194

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Supervisor (Privileged) Instructions
MOTOROLA M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL 6-31
PDBcc Test, Decrement, and Branch PDBcc
(MC68851)
PMMU Status Register:Not affected.
Instruction Format:
Instruction Fields:
Register field—Specifies the data register in the main processor to be used as the
counter.
MC68851 Condition field—Specifies the MC68851 condition to be tested. This field is
passed to the MC68851, which provides directives to the main processor for
processing this instruction.
Displacement field—Specifies the distance of the branch in bytes.
1514131211109876543210
1111000001001COUNT REGISTER
0000000000 MC68851 CONDITION
16-BIT DISPLACEMENT
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