Z8 Opcode Listing
Zilog Z8 Microcontroller Instruction Set.
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src = SOURCE OPERAND
dst = DESTINATION OPERAND
cc = CONDITION CODE
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Load Instructions:
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CLR dst CLEAR dst <= 0
LD dst,src LOAD dst <= src
LDC dst,src LOAD CONSTANT dst <= src
LDE dst,src LOAD EXTERNAL dst <= src
POP dst POP dst FROM STACK
PUSH src PUSH src INTO STACK
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Arithmetic Instructions:
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ADC dst,src ADD WITH CARRY
ADD dst,src ADD
CP dst,src COMPARE
DA dst DECIMAL ADJUST
DEC dst DECREMENT
DECW dst DECREMENT WORD
INC dst INCREMENT
INCW dst INCREMENT WORD
SBC dst,src SUBTRACT WITH CARRY
SUB dst,src SUBTRACT
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Logical Instructions:
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AND dst,src LOGICAL AND
COM dst COMPLEMENT oposite bits
OR dst,src LOGICAL OR
XOR dst,src EXCLUSIVEOR
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Program Control Instructions:
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CALL dst CALL SUB ROUTINE
DJNZ dst,src DEC JUMP NON-ZERO label,counter
IRET INTERRUPT RETURN
JP cc,dst JUMP
JR cc,dst JUMP RELATIVE
RET RETURN FROM SUB ROUTINE
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Bit Manipulation Instructions:
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TCM dst,src TEST COMPLEMENT MASK test 1
TM dst,src TEST MASK test 0
AND dst,src BIT CLEAR with 0 in src
OR dst,src BIT SET with 1 in src
XOR dst,src BIT COMPLEMENT with 1 in src
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Block Transfer Instructions:
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LDCI dst,src LOAD CONSTANT AUTOINCREMENT
LDEI dst,src LOAD EXTERNAL AUTOINCREMENT
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Rotate and Shift Instructions:
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RL dst ROTATE LEFT
RLC dst ROTATE LEFT THROUGH CARRY
RR dst ROTATE RIGHT
RRC dst ROTATE RIGHT THROUGH CARRY
SRA dst SHIFT RIGHT ARITHMETIC
SWAP dst SWAP NIBBLES
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CPU Control Instructions:
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CCF COMPLEMENT CARRY FLAG
DI DISABLE INTERRUPS
EI ENABLE INTERRUPS
HALT HALT
NOP NO OPERATION
RCF RESET CARRY FLAG
SCF SET CARRY FLAG
SRP src SET REG POINTER load with src
STOP STOP
WDH WATCH DOG ENABLE DURING HALT
WDT WATCH DOG ENABLE OR REFRESH TIMER
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FLAG DEFINITIONS
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C CARRY
Z ZERO
S SIGN
V OVERFLOW
D DECIMAL ADJUST
H HALF CARRY
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CONDITION CODES:
MNEMONIC DEFINITION FLAG SETTINGS
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F ALWAYS FALSE -
(blank) ALWAYS TRUE -
C CARRY C=1
NC NO CARRY C=0
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Z ZERO Z=1
NZ NON ZERO Z=0
PL PLUS S=0
MI MINUS S=1
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OV OVERFLOW V=1
NOV NO OVERFLOW V=0
EQ EQUAL Z=1
NE NOT EQUAL Z=0
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GE GREATER THAN OR EQUAL (S XOR V)=0
LT LESS THAN (S XOR V)=1
GT GREATER THAN (Z OR (S XOR V))=0
LE LESS THAN OR EQUAL (Z OR (S XOR V))=1
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UGE UNSIGNED GREATER THAN OR EQUAL C=0
ULT UNSIGNED LESS THAN C=1
UGT UNSIGNED GREATER THAN (C=0 AND Z=0)=1
ULE UNSIGNED LESS THAN OR EQUAL (C OR Z)=1
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