Xilinx UG129 manual Returni Disable

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Table 3-1:PicoBlaze Instruction Set (alphabetical listing)

Instruction	Description	Function	ZERO	CARRY
RETURNI DISABLE	Return from interrupt service routine.	PC Å TOS	?	?
(RETI DISABLE)	Interrupt remains disabled.	ZERO Å Preserved ZERO
		CARRY Å Preserved CARRY
		INTERRUPT_ENABLE Å 0
RETURNI ENABLE	Return from interrupt service routine.	PC Å TOS	?	?
(RETI ENABLE)	Re-enable interrupt.	ZERO Å Preserved ZERO
		CARRY Å Preserved CARRY
		INTERRUPT_ENABLE Å 1
RL sX	Rotate register sX left	sX Å {sX[6:0],sX[7]}	?	?
		CARRY Å sX[7]
RR sX	Rotate register sX right	sX Å {sX[0],sX[7:1]}	?	?
		CARRY Å sX[0]
SL0 sX	Shift register sX left, zero fill	sX Å {sX[6:0],0}	?	?
		CARRY Å sX[7]
SL1 sX	Shift register sX left, one fill	sX Å {sX[6:0],1}	0	?
		CARRY Å sX[7]
SLA sX	Shift register sX left through all bits,	sX Å {sX[6:0],CARRY}	?	?
	including CARRY	CARRY Å sX[7]
SLX sX	Shift register sX left. Bit sX[0] is	sX Å {sX[6:0],sX[0]}	?	?
	unaffected.	CARRY Å sX[7]
SR0 sX	Shift register sX right, zero fill	sX Å {0,sX[7:1]}	?	?
		CARRY Å sX[0]
SR1 sX	Shift register sX right, one fill	sX Å {1,sX[7:1]}	0	?
		CARRY Å sX[0]
SRA sX	Shift register sX right through all bits,	sX Å {CARRY,sX[7:1]}	?	?
	including CARRY	CARRY Å sX[0]
SRX sX	Arithmetic shift register sX right. Sign	sX Å {sX[7],sX[7:1]}	?	?
	extend sX. Bit sX[7] Is unaffected.	CARRY Å sX[0]
STORE sX, (sY)	Write register sX to scratchpad RAM	RAM[(sY)] Å sX	-	-
(STORE sX, sY)	location pointed to by register sY
STORE sX, ss	Write register sX to scratchpad RAM	RAM[ss] Å sX	-	-
	location ss
SUB sX, kk	Subtract literal kk from register sX	sX Å sX – kk	?	?
SUB sX, sY	Subtract register sY from register sX	sX Å sX – sY	?	?
SUBCY sX, kk	Subtract literal kk from register sX with	sX Å sX – kk - CARRY	?	?
(SUBC)	CARRY (borrow)
SUBCY sX, sY	Subtract register sY from register sX with	sX Å sX – sY - CARRY	?	?
(SUBC)	CARRY (borrow)

PicoBlaze 8-bit Embedded Microcontroller www.xilinx.com 21

UG129 (v1.1.2) June 24, 2008