Motorola DSP96002 - Manual (Page 887)

16 MOTOROLA
PUNLOCKR Program-Cache-Sector PUNLOCKR
Relative Unlock
00 0000 0aaa aaaa
31 14 13 0
0000 0011 11aa aaaa aa
Operation:
Unlock sector by PC + xx
Unlock sector by PC + xxxx
Unlock sector by PC + Rn
Assembler Syntax:
PUNLOCKR label
PUNLOCKR Rn
Description:
Unlock the cache sector to which the sum PC + specified displacement belongs. If the sum does not belong
to any cache sector, and is therefore definitely unlocked, nevertheless, load the least recently used cache
sector tag with the 25 most significant bits of the sum. Update the LRU stack accordingly.
The displacement is a 2’s complement 32-bit integer that represents the relative distance from the current
PC to the address to be locked. Short Displacement, Long Displacement and Address Register PC Relative
addressing modes may be used. The Short Displacement 15-bit data is sign extended to form the 32-bit
PC Relative Displacement.
The PUNLOCKR instruction is enabled only in Cache Mode. In PRAM Mode it will cause an illegal instruc-
tion trap to be taken.
CCR Condition Codes: Not affected.
ER Status Bits: Not affected.
IER Flags: Not affected.
Instruction Format: PUNLOCKR label (short)
00 0000 0000 0000
31 14 13 0
PC RELATIVE DISPLACEMENT
0000 0011 0100 1000 00
Instruction Format: PUNLOCKR label
00 0000 0000 0000
31 14 13 0
0000 0011 0100 001R RR
Instruction Format: PUNLOCKR Rn