Xilinx UG129 manual Enable Interrupt

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Chapter 3: PicoBlaze Instruction Set

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

Instruction	Description	Function	ZERO	CARRY
ENABLE INTERRUPT	Enable interrupt input	INTERRUPT_ENABLE Å 1	-	-
(EINT)
Interrupt Event	Asynchronous interrupt input. Preserve	Preserved ZERO Å ZERO	-	-
	flags and PC. Clear	Preserved CARRY Å CARRY
	INTERRUPT_ENABLE flag. Jump to
		INTERRUPT_ENABLE Å 0
	interrupt vector at address 3FF.
		TOS Å PC
		PC Å 3FF
FETCH sX, (sY)	Read scratchpad RAM location pointed to	sX Å RAM[(sY)]	-	-
(FETCH sX, sY)	by register sY into register sX
FETCH sX, ss	Read scratchpad RAM location ss into	sX Å RAM[ss]	-	-
	register sX
INPUT sX, (sY)	Read value on input port location pointed	PORT_ID Å sY	-	-
(IN sX, sY)	to by register sY into register sX	sX Å IN_PORT
INPUT sX, pp	Read value on input port location pp into	PORT_ID Å pp	-	-
(IN)	register sX	sX Å IN_PORT
JUMP aaa	Unconditionally jump to aaa	PC Å aaa	-	-
JUMP C, aaa	If CARRY flag set, jump to aaa	If CARRY=1, PC Å aaa	-	-
JUMP NC, aaa	If CARRY flag not set, jump to aaa	If CARRY=0, PC Å aaa	-	-
JUMP NZ, aaa	If ZERO flag not set, jump to aaa	If ZERO=0, PC Å aaa	-	-
JUMP Z, aaa	If ZERO flag set, jump to aaa	If ZERO=1, PC Å aaa	-	-
LOAD sX, kk	Load register sX with literal kk	sX Å kk	-	-
LOAD sX, sY	Load register sX with register sY	sX Å sY	-	-
OR sX, kk	Bitwise OR register sX with literal kk	sX Å sX OR kk	?	0
OR sX, sY	Bitwise OR register sX with register sY	sX Å sX OR sY	?	0
OUTPUT sX, (sY)	Write register sX to output port location	PORT_ID Å sY	-	-
(OUT sX, sY)	pointed to by register sY	OUT_PORT Å sX
OUTPUT sX, pp	Write register sX to output port location	PORT_ID Å pp	-	-
(OUT sX, pp)	pp	OUT_PORT Å sX
RETURN	Unconditionally return from subroutine	PC Å TOS+1	-	-
(RET)
RETURN C	If CARRY flag set, return from subroutine	If CARRY=1, PC Å TOS+1	-	-
(RET C)
RETURN NC	If CARRY flag not set, return from	If CARRY=0, PC Å TOS+1	-	-
(RET NC)	subroutine
RETURN NZ	If ZERO flag not set, return from	If ZERO=0, PC Å TOS+1	-	-
(RET NZ)	subroutine
RETURN Z	If ZERO flag set, return from subroutine	If ZERO=1, PC Å TOS+1	-	-
(RET Z)

20	www.xilinx.com	PicoBlaze 8-bit Embedded Microcontroller
		UG129 (v1.1.2) June 24, 2008