From Spartan Blue CPU
Instruction
Mnemonic Opcode
HLT 0000 Halt
NOP 0001 No operation
NOT 0002 ACC=~ACC
RAL 0003 Rotate Left ACC
INCA 0005 Increment Accumulator
DECA 0006 Decrement Accumulator
RAR 0007 Rotate Right ACC
FRAME 0008 Load IX with SP
LDXA 0009 Load A with [IX]
SKIP 001X Skip (takes 3 bit condition code, plus "not" bit
SKIPPN 0020/21 (See below for all skips)
QOFF 0022 Turn Q off
QON 0023 Turn Q on
QTOG 0024 Toggle Q
LDI 0025 Load Immediate
INCX 0030 Increment IX
DECX 0031 Decrement IX
STX 0032 ACC=IX
JMPA 0033 Jump to accumulator value
SWAP 0034 Swap ACC bytes
POP 0040 Pop from stack
RET 0041 Return from subroutine
POPX 0042 Pop to IX
POPF 0043 Pop to Flags
PUSH 0050 Push to stack
PUSHX 0052 Push IX
PUSHF 0053 Push Flags
ADD 1XXX Add Acc+[XXX]
XOR 2XXX XOR Acc x [XXX]
AND 3XXX And Acc & [XXX]
IOR 4XXX Inclusive OR Acc|[XXX]
CMP 5XXX Compare ACC-[XXX] (discard result, just flags)
LDA 6XXX Load A with [XXX]
STA 7XXX Store A to [XXX]
CALL 8XXX Call XXX
SUB 9XXX Subtract Acc-[XXX]
JMP AXXX Jump to XXX
LDX BXXX Load X with XXX
LDS CXXX Load Stack pointer with XXX
--- DXXX Not used
LDAX EXXX ACC=[XXX+IX]
STAX FXXX [XXX+IX]=ACC
SO 0011 Skip Overflow
SZ 0012 Skip Zero
SZO 0013 Skip Zero or Overflow
SC 0014 Skip Carry
SCO 0015 Skip Carry or Overflow
SCZ 0016 Skip Carry or Zero
SCZO 0017 Skip Carry or Zero or Overflow
SNO 0019 Skip no Overflow
SNZ 001A Skip no Zero
SNZO 001B Skip no zero and no overflow
SNC 001C Skip no carry
SNCO 001D Skip no carry and no overflow
SNCZ 001E Skip no Carry and no Zero
SNCZO 001F Skip no Carry and no Zero and no Overflow
SNEG 0020 Skip Negative
SPOS 0021 Skip Positive
