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2.5.7 System Control Instructions
Table 2-10 describes the system control instructions.
Table 2-10. System Control Instructions
Instruction
RTE
SLEEP
LDC
Size
—
—
B
STC
B
ANDC
B
ORC
B
XORC
B
NOP
—
Function
Returns from an exception-handling routine.
Causes a transition to the power-down state.
Rs → CCR, #IMM → CCR
Moves immediate data or general register contents to the condition code
register.
CCR → Rd
Copies the condition code register to a specified general register.
CCR ∧ #IMM → CCR
Logically ANDs the condition code register with immediate data.
CCR ∨ #IMM → CCR
Logically ORs the condition code register with immediate data.
CCR ⊕ #IMM → CCR
Logically exclusive-ORs the condition code register with immediate data.
PC + 2 → PC
Only increments the program counter.
Note: * Size: operand size
B: Byte
Figure 2-9 shows the object code formats of the system control instructions.
15
8
7
0
op
15
8
RTE, SLEEP, NOP
7
0
op
15
rn
8
op
7
LDC, STC (Rn)
0
IMM
ANDC, ORC,
XORC, LDC (#xx:8)
Notation:
op:
rn:
IMM:
Operation field
Register field
Immediate data
Figure 2-9. System Control Instruction Object Code Formats
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