Supervisor (Privileged) Instructions
MOTOROLA M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL 6-51
PMOVE Move to/from MMU Registers PMOVE
(MC68EC030)
Operation: If Supervisor State
Then (Source) → MRn or MRn → (Destination)
Assembler PMOVE MRn, < ea >
Syntax: PMOVE < ea > ,MRn
Attributes: Size = (Word, Long, Quad)
Description: Moves the contents of the source effective address to an access control
register or moves the contents of an access control register to the destination effective
address.
The instruction is a long-word operation for the access control registers (AC0 and
AC1). It is a word operation for the access control unit status register (ACUSR).
Writing to the ACx registers enables or disables the access control register according
to the E-bit written. If the E-bit = 1, the access control register is enabled. If the E-bit =
0, the register is disabled
Condition Codes:
Not affected.
ACUSR:
Not affected unless the ACUSR is specified as the destination operand.
Instruction Format:
ACUSR
Instruction Fields:
Effective Address field—Specifies the memory location for the transfer.
R/W field—Specifies the direction of transfer.
0—Memory to ACUSR
1—ACUSR to memory
1514131211109876543210
1111000000
EFFECTIVE ADDRESS
MODE REGISTER
011000R/W000000000
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