Motorola MPC860 PowerQUICC User Manual page 167

Note that if the LR update option is enabled for any of these instructions, these forms of the
instructions are invalid in the MPC860.
6.2.4.4 Trap Instructions
The trap instructions shown in Table 6-14 are provided to test for a speciÞed set of
conditions. If any of the conditions tested by a trap instruction are met, the system trap
handler is invoked. If the tested conditions are not met, instruction execution continues
normally.
Trap Word Immediate
Trap Word
See Appendix F, ÒSimpliÞed Mnemonics,Ó in The Programming Environments Manual for
a complete set of simpliÞed mnemonics.
6.2.4.5 Processor Control Instructions
Processor control instructions are used to read from and write to the condition register
(CR), machine state register (MSR), and special-purpose registers (SPRs), and to read from
the time base register (TBU or TBL).
6.2.4.5.1 Move to/from Condition Register Instructions
Table 6-15 lists the instructions provided by the MPC860 for reading from or writing to the
CR.
Table 6-15. Move to/from Condition Register Instructions
Move to Condition Register Fields
Move to Condition Register from XER
Move from Condition Register
6.2.4.6 Memory Synchronization InstructionsÑUISA
Memory synchronization instructions control the order in which memory operations are
completed with respect to asynchronous events, and the order in which memory operations
are seen by other processors or memory access mechanisms. See Section 8.6.6, ÒAtomic
Memory References,Ó for additional information about these instructions and about related
aspects of memory synchronization. Table 6-18 lists the UISA memory synchronization
instructions for the MPC860.
MOTOROLA
Table 6-14. Trap Instructions
Name
Name
Chapter 6. MPC860 Instruction Set
Part II. PowerPC Microprocessor Module
Mnemonic Syntax
twi TO,rA,SIMM
tw TO,rA,rB
Mnemonic Syntax
mtcrf CRM,rS
mcrxr crfD
mfcr rD
6-17