Excalibur electronic A-MNL-NIOSPROG-01.1 manual Wrctl, Write Control Register

32-Bit Instruction Set

WRCTL

Write Control Register

Operation:				CTLk ← RA
Assembler Syntax:				WRCTL %rA
Example:				Not preceded by PFX:
				WRCTL %g7 ; writes %g7 to STATUS reg
				NOP ; required
				Preceded by PFX:
				PFX 1
				WRCTL %g7 ; writes %g7 to ISTATUS reg
Description:				Not preceded by PFX:
				Loads the STATUS register with RA. WRTCL to STATUS must be followed by a
				NOP instruction.
				Preceded by PFX:
				Writes the value in RA to the machine-control register selected by K. See the
				programmer’s model for a list of the machine-control registers and their indices.
Condition Codes:				If the target of WRCTL is the STATUS register, then the condition-code flags are
				directly set by the WRCTL operation from bits RA[3..0]. For any other WRCTL
				target register, the condition codes are unaffected.
Instruction Format:				Rw
Instruction Fields:				A = Register index of operand RA
15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
0	1	1	1	1	1	1	1	0	0	0			A

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