i~.

M=”-51 PROGRAMMER’SGUIDE AND INSTRUCTION SET

M=@-51 INSTRUCTION SET

Table 10.8051 Inatruotion Set Summary

Interrupt ResponseTime: Refer to Hardware De- Oaeilfstor

Mnemonic Dsseription
scription Chapter. ‘m Period

Instructions that Affect Flag Settings(l) ---

ADD
.-
A,Rn
.
Ma registerto 1 12
Instruetkm Ffsg Inetmetion Flsg Accumulator
C OV AC C OV AC ADD A,direct Adddirectbyteto 2 12
ADD xx X CLRC o Accumulator
ADDC xx X CPLC x ADD A,@Ri Addindirect
RAM 1 12
SUBB xx X ANLC,bit X toAccumulator
MUL ox ANLC,/bit X ADD A,#date Addimmediate 2 12
DIV ox ORLC,bit X dateto
DA x ORLC,bit X Accumulator
RRC x MOVC,bit X ADDC A,Rn Addregister
to 1 12
RLC x CJNE x Accumulator
SETBC 1 withCarry
(l)FJotethat operationson SFR byte address 208or ADDC A,dirsct Adddirectbyteto 2 12
bit addresses 209-215(i.e., the PSW or bits in the Accumulator
PSW) will also afect flag settings. withCarry
ADDC A.@Ri Addindirect 1 12
Nota on inetruetionsat and ad&aesingmodes: RAMto
Rn — Register R7-RO of the currently se- Accumulator
lectedRegister Bank. withCarry
direct — 8-bit internal data location’s address. ADDC A,#date Addimmediate 2 12
This could been Internal Dsta RAM datetoAcc
locetion (0-127) or a SFR [i.e., I/O withCeny
pofi control register, status register, SUBB A,Rn Subtract
Register 1 12
etc. (128-255)]. fromAcewith
@Ri — 8-bit internal data RAM location (O- borrow
255)addreasedindirectly through reg- SUBB A,direct Subtrectdirect 2 12
ister R1 or RO. bytefromAcc
#data — 8-bitco~~t includedin instruction. withborrow
#data 16— 16-bitconstant includedin instmction. SUBB A.@Ri Subfrectindiract 1 12
addr 16 — 16-bit destination address. Used by RAMfromACC
LCALL & LJMP. A branch can be withborrow
anywhere within the 64K-byte Pro- A.#date Subtract 2 12
gram Memory SddR$S SpCCe. immediatedate
addr 1 — n-bit destination sddrrss. Used by fromAccwith
ACALL& AJMP. The branch willbe borrw
within the same 2K-byte page of pro- INC A Increment 1 12
gram memo~ as the first byte of the Accumulator
foil-g instruction. INC Rn Incrsmsnt
register 1 12
rel — Signed(two’scomplement)S-bitoffset INC direct Increment direct 2 12
byte.Usedby SJMP end all condition- byte
al jumps. Range is -128 to + 127 INC @Ri Incrementdirect 1 12
bytes relative to first byte of the fol- RAM
lowinginstruction. DEC A Decrement 1 12
bit — Direct Addressedbit in Internal Data Accumulator
W or SpecialFunction Register. DEC Rn Decrement 1 12
Regieter
DEC direct Decrement direct 2 12
byte
DEC @Ri Decrement 1 12
indirect
RAM
WImnemonics
copyrighted
@lntelCor’pxetion
1980

.
2-21
i~e McS@-51PROGRAMMER’SGUIDE AND INSTRUCTION SET

Table 10.8051 Inetruotion Sat Summary (Continued)

~we o:acw~r
Mnemonic Deaoription

tRITNWTIC OPERATIONS (Continued)

. ------ urtm
LUUIGAL
----------
IIUNS {wmunuao)
,A . . ,.

NC DPTR Increment Date 1 24 RL A 1 12

Pointer Accumulator Left
dUL AB MultiPiy
A& B 1 48 RLC A Rotate 1 12
)IV AB Ditie A byB 1 48 Accumulator Left
)A A DecimelAdjuet 1 12 through theCarry
Accumulator RR A Rotate 1 12
.OGICALOPERATtONS Accumulator
\NL A,Rn ANDRegieterto 1 12 Right
Accumulator RRC A Rotate 1 12
tNL A,direct ANDdiractbyte 2 12 Accumulator
toAccumulator Rightthrough
4NL A,@Ri ANDindirect 1 12 mecerry
RAMto SWAP A Swapnibbles 1 12
Accumulator withinthe
4NL A,#date ANDimmediate 2 12 Accumulator
datato DATATRANSFER
Accumulator MOV A,Rn Move 1 12
4NL direct,A ANDAccumulator 2 12 register
to
todirectbyte Accumulator
4NL diract,#data ANDimmediate 3 24 MOV A,direct Movediract 2 12
datatodirectbyte byteto
)RL A,Rn ORregister to 1 12 Accumulator
Accumulator MOV A,@Ri Moveindirect 1 12
2RL A,direct ORdirectbyteto 2 12 RAMto
Accumulator Accumulator
2RL A,@Ri ORindiractRAM 1 12 MOV A,#date Move 2 12
toAccumulator immediate
3RL A,#date ORimmediate 2 12 dateto
datato Accumulator
Accumulator MOV Rn.A Move 1 12
3RL dirac4,A ORAccumulator 2 12 Accumulator
todirectbyte toregister
3RL dirsct,~date ORimmediate 3 24 MOV Rn,direot Movedirect 2 24
detetodiractbyte byteto
KRL A,Rn Excluaiva-OR 1 12 register
regieterto MOV Rn,#date Move 2 12
Armmulator immediate date
I(RL A,diraot ExclusMe-OR 2 12 toregister
directbyteto MOV direct,A Mova 2 12
Accumulator Accumulator
KRL A,@Ri Exclush/e-OR 1 12 todirectbyte
indirect
RAMto MOV direct,Rn Moveregister 2 24
Accumulator todirectbyte
KRL A,#data Exclusiva-OR 2 12 MOV diract,directMovedirect 3 24
immediate datato bytatodiract
Accumulator MOV direct,@Ri Moveindirect 2 24
KRL direct,A Excluaive-OR 2 12 RAMto
Accumulator to directbyte
directbyte MOV direct,#date Move 3 24
KRL direct,gdata Exclueive-OR 3 24 immediate data
immediate date todireotbyte
todirectbyte MOV @Ri,A Move 1 12
CLR A Clear 1 12 Accumulator to
Accumulate
Complement 1 12
I indirect
RAM
CPL A Allmnemonics
copyrighted@lnteiCorporation
19S0
Accumulator
.2-22
in~. M=”-51 PROGRAMMER’S GUIDE AND INSTRUCTION SET

Table 10.8051 Instruction Set Summary(Continued)

I Mnemonic OeecriptfonByte ~~k~o’ Mnemonic Description Byte

Oeciltetor
Period
IDATATRANSFER (continued) BOOLEAN VARIABLEMANIPULATION
MOV @Ri,direct Movedirect 2 24 GLH L wearwny 1 12
byteto CLR bit Clesrdirectbit 2 12
indirect RAM SETB c SetCarry 1 12
MOV @Ri,#date Move 2 12 bit Setdirectbit 2 12
immediate CPL c Complement 1 12
dateto carry
indirect RAM CPL bit Complement 2 12
MOV DPTR,#data16LoedDets 3 24 directbit
Pointerwitha ANL C,bit ANDdirectbit 2 24
16-bitconstant toCARRY
MOVC A,@A+DPTR MoveMe 1 24 ANL C,/bit ANDcomplement 2 24
byterelativeto ofdirectbit
DPTRtoAcc tocarry
MOVC A,@A+PC MoveCode 1 24 ORL C,bit ORdirectbit 2 24
byterelativeto tocarry
PCtoAcc ORL C,/bit ORcomplement 2 24
MOVX A,@Ri Move 1 24 ofdirectbit
External tocarry
RAM(8-bit MOV C,bit Movedirectbit 2 12
eddr)toAcc tocarry
MOVX A,@DPTR Move 1 24 MOV bit,C MoveCsrryto 2 24
External directbit
RAM(l&bit JC rel JumpifCsny 2 24
addr)toAcc isset
MOVX @Ri,A MoveAccto 1 24 JNC rel JumpifCarry 2 24
External RAM notset
(8-bitaddr) JB bit,rel Jumpifdirecf 3 24
MOVX @DPTR,A MoveAccto 1 24 Bitisset
External RAM JNB bi$rel Jumpifdirect 3 24
(lS-bitaddr) BitisNotset
PUSH direct Pushdirect 2 24 JBC bit.rel Jumoifdirect 3 24
byteonto Bitisset&
stack clearbit
POP direct Popdirect 2 24 PROGRAMBRANCHING
bytefrom ACALL addrl1 Absolute 2 24
stack Subroutine
XCH A,Rn Exchange 1 12 call
registerwith LCALL addr16 Long 3 24
Subroutine
XCH A,direct Exchange 2 12 call
directbyte RET Returnfrom 1 24
with Subroutine
RETI Retumfrom 1 24
XCH A,@Ri Exchange 1 12 intempt
indirect
RAM AJMP addrll Absolute 2 24
with Jump
WMP addr16 LongJump 3 24
XCHD A,@Ri Exchange low- 1 12 SJMP rel ShortJumo 2 24
orderDigif (relativeaddr)
indirect
RAM VImnemonicscopyrigMed @lntelCorporation
1980
with Acc
I

2-23
int# MCS@-51PROGRAMMER’S GUIDE AND INSTRUCTION SET

Table 10.8051 Instruction Set SummarY (Continued)

Mnemonic Description Byte ‘~or Mnemonic Description Syte ~~or

.FmWrIANI
. . . . . .. BmANGmNQ
-m . ..-,,,..- ,-- —.,....
(wnunueq
.’,
PROGRAM BRANCHING (Continued)
JMP @A+DPTR Jumpindirecf 1 24 CJNE Rn,#date,rei Compare 3 24
relativetothe immediate to
DPTR register
and
JZ rel Jumpif 2 24 JumpifNot
Accumulator Equal
isZero CJNE @Ri,#data,rel Compare 3 24
JNZ rel Jumpif 2 24 immediate to
Accumulator indirect
and
isNotZero JumpifNot
CJNE A,direct,rei Compare 3 24 Equal
directbyteto DJNZ Rn,rei Decrement 2 24
AccandJump registerand
ifNotEquai JumpifNot
CJNE A,#date,rel Compare 3 24 Zero
immediate to DJNZ direct,rel Decrement 3 24
AccandJumo directbyte
ifNotEqual andJumpif
NotZero
NOP NoOperation 1 12
dlmnemonics
copyrighted @intelCorporation
1980

2-24
i~. M~@-51 PROGRAMMERS GUIDE AND INSTRUCTION SET

Table 11. Instruction Q i in Haxadecirnal Order

Hex Number Hex Number
Mnemonic Operands Mnemonic operands
Code of Bytes code of Bytes
00 1 NOP 33 1 RLC A
01 2 AJMP codesddr 34 2 ADDC A,#data
02 3 WMP codesddr 35 2 ADDC A,datsaddr
03 1 RR A 36 1 ADDC A,@RO
04 1 INC A 37 1 ADDC A,@Rl
05 2 INC dstsaddr 36 1 ADDC A,RO
06 1 INC @RO 39 1 ADDC A,R1
07 1 INC @Rl 3A 1 ADDC A,R2
06 1 INC RO 3B 1 ADDC A,R3
Oe 1 INC RI 3C 1 ADDC A,R4
OA 1 INC R2 3D 1 ADDC A,R5
OB 1 INC R3 3E 1 ADDC A,R6
Oc 1 INC R4 3F 1 ADD(2 A,R7
OD 1 INC R5 40 2 JC codeaddr
OE 1 INC R6 41 2 AJMP codeaddr
OF 1 INC R7 42 2 ORL datsaddr,A
10 3 JBC bitaddr,codeaddr 43 3 ORL dateaddr,#data
11 2 ACALL codeaddr 44 2 ORL A,#data
12 3 LCALL codeaddr 45 2 ORL A,dataaddr
13 1 RRC A 46 1 ORL A,@RO
14 1 DEC A 47 1 ORL A,@Rl
15 2 DEC dataaddr 46 1 ORL A,RO
16 1 DEC @RO 49 1 ORL A,R1
17 1 DEC @Rl 4A 1 ORL A,R2
16 1 DEC RO 4B 1 ORL A,R3
19 1 DEC RI 4C 1 ORL A,R4
1A 1 DEC R2 4D 1 ORL A,R5
lB 1 DEC R3 4E 1 ORL A,Re
lC 1 DEC R4 4F 1 ORL A,R7
ID 1 DEC R5 50 2 JNC codeaddr
lE 1 DEC R6 51 2 ACALL codeaddr
IF 1 DEC R7 52 2 ANL dataaddr,A
20 3 JB bifaddr,codeaddr 53 3 ANL dataaddr,#data
21 2 AJMP codeaddr 54 2 ANL A,#data
22 1 RET 55 2 ANL A,datsaddr
23 1 RL A 56 1 ANL A,@RO
24 2 ADD A,#dats 57 1 ANL A,@Rl
25 2 ADD A,datsaddr 5e 1 ANL A,RO
26 1 ADD A,@RO 59 1 ANL A,R1
27 1 ADD A,@Rl 5A 1 ANL A,R2
28 1 ADD A,RO 5B 1 ANL A,R3
23 1 ADD A,R1 5C 1 ANL A,R4
2A 1 ADD A,R2 5D 1 ANL A,R5
2B 1 ADD A,R3 5E 1 ANL A,R6
2C 1 ADD A,R4 5F 1 ANL A,R7
2D ADD A,R5 eo 2 JZ codeaddr
2E ; ADD A,R6 61 2 AJMP codeaddr
2F ADD A,R7 62 2 XRL datesddr,A
30 : JNB bitaddr,codeaddl 63 3 XRL datesddr,#data
31 2 ACALL codeaddr 64 2 XRL A,#data
32 1 RETI 65 2 XRL A,dataaddr

2-25
int# M~@.51 PROGRAMMER’S GUIDE AND INSTRUCTION SET

s .. . . .-—-------- ----- ,--. .....---,

Hex Number Hex Number

Mnemonic Oparanda Mnemonic operands
Code of Bytaa Coda of Bytaa
5s 1 XRL A,@RO 99 1 SUBB A,R1
57 1 XRL A,@Rl 9A 1 SUBB A,R2
56 1 XRL ~RO 9B 1 SUBB A,R3
59 1 XRL A,RI 9C 1 SUBB A,R4
3A 1 XRL A,R2 9D 1 SUBB A,R5
5B 1 XRL A,R3 9E 1 SUBB A,R6
5C 1 XRL A,R4 9F 1 SUBB A,R7
6D 1 XRL A,R5 AO 2 ORL C,/bitaddr
SE 1 XRL A,R6 Al 2 AJMP codeaddr
SF 1 XRL A,R7 A2 2 MOV C,bitaddr
70 2 JNZ codeaddr A3 1 INC DPTR
71 2 ACALL codeaddr A4 1 MUL AB
72 2 ORL C,bitaddr A5 reaervad
73 1 JMP @A+DPTR A6 2 MOV @RO,dataaddr
74 2 MOV A,#data A7 2 MOV @Rl,dataaddr
75 3 MOV datsaddr,#data A8 2 MOV RO,dataaddr
76 2 MOV @RO, #data A9 2 MOV Rl,dataaddr
77 2 MOV @Rl,#data AA 2 MOV R2,dataaddr
76 2 MOV RO,#data AB 2 MOV R3,dstaaddr
79 2 MOV Rl, #data AC 2 MOV R4,dataaddr
7A 2 MOV R2,#data AD 2 MOV R5,dataaddr
70 2 MOV R3,#data AE 2 MOV R6,dataaddr
7C 2 hAov R4,#data AF 2 MOV R7,dataaddr
7D 2 Mov R5,#data BO 2 ANL C,/bitaddr
7E 2 MOV R6,#data B1 2 ACALL codeaddr
7F 2 MOV R7,#data 02 2 CPL bitaddr
80 2 SJMP codeaddr B3 1 CPL c
81 2 AJMP codeaddr 24 3 CJNE A,#data,codeaddr
82 2 ANL C,bitaddr B5 3 CJNE A,dataaddr,code
addr
83 1 MOVC A,@A+PC B6 3 CJNE @RO, #dats,codaaddr
84 1 DIV AB B7 3 CJNE @Rl,#data,codeaddr
85 3 MOV dataaddr,dataaddr 08 3 CJNE RO,#data,codeaddr
86 2 MOV dataaddr,@RO B9 3 CJNE Rl,#datasodeaddr
87 2 MOV dataaddr,@Rl BA 3 CJNE R2,#data$odeaddr
66 2 MOV dataaddr,RO BB 3 CJNE R3,#daQcodeaddr
89 2 MOV dataaddr,Rl BC 3 CJNE R4,#dats@de addr
8A 2 MOV dataaddr,R2 BD 3 CJNE R5,#data,codeaddr
8B 2 MOV dataaddr,R3 BE 3 CJNE R8,#data,codeaddr
SC 2 MOV dataaddr,R4 BF 3 CJNE R7,#data,codeaddr
8D 2 MOV dataaddr,R5 co 2 PUSH dataaddr
8E 2 MOV dataaddr,R6 c1 2 AJMP codeaddr
8F 2 MOV dataaddr,R7 C2 2 CLR bitaddr
90 3 MOV DPTR,#data C3 1 CLR c
91 2 ACALL codeaddr C4 1 SWAP A
92 2 MOV bitsddr,C C5 2 XCH A,dataaddr
93 1 MOVC A,@A+DPTR C8 1 XCH A,@RO
94 2 SUBB A,#data C7 1 XCH A,@Rl
95 2 SUBB A,dataaddr C8 1 XCH A,RO
M 1 SUBB A,@RO C9 1 XCH A,R1
97 1 SUBB A,@Rl CA 1 XCH A,R2
98 1 SUBB A,RO CB 1 XCH A,R3

2-26
ir& M=@-51 PROGRAMMER’SGUIDE AND INSTRUCTION SET

Table 11. Instruction Opoode In1 xadecimal Order (Continued)

Hex Number Hex Number
Operende Mnemonic Operande
Code of Bytee ‘nemonic Code of Bytee
cc 1 XCH A,R4 E6 1 MOV A,@RO
CD 1 XCH A,R5 E7 1 MOV A,@Rl
CE 1 XCH A,R6 E8 1 MOV A,RO
CF 1 XCH A,R7 E9 1 MOV A,R1
Do 2 POP dateaddr EA 1 MOV A,R2
D1 2 ACALL codaaddr EB 1 MOV A,R3
D2 2 SETB biladdr EC 1 MOV A,R4
D3 1 SETB c ED 1 MOV A,R5
D4 1 DA A EE i MOV A,R6
D5 3 DJNZ dateaddr,codeaddr EF 1 MOV A,R7
D6 1 XCHD A,@RO FO 1 MOVX @DPTR,A
D7 1 XCHD A,@Rl FI 2 ACALL codeaddr
CM 2 DJNZ RO,code addr F2 1 MOVX @RO,A
D9 2 DJNZ Rl,codeaddr F3 1 MOVX @Rl,A
DA 2 DJNZ R2,codeaddr F4 1 CPL A
DB 2 DJNZ R3,cadeaddr F5 2 MOV dataaddr,A
DC 2 DJNZ R4,codeaddr F6 1 MOV @RO,A
DD 2 DJNZ R5,codaaddr F7 1 MOV @Rl~
DE 2 DJNZ R6,c0deaddr F8 1 MOV RO,A
DF 2 DJNZ R7,codeaddr F9 1 MOV RI,A
EO 1 MOVX A,@DPTR FA 1 MOV R2,A
El 2 AJMP codeaddr FB 1 MOV R3,A
E2 1 MOVX A,@RO FC 1 MOV R4,A
E3 1 MOVX A,@Rl FD 1 MOV R5,A
E4 1 CLR A FE 1 MOV R6,A
E5 2 MOV A,dateaddr FF 1 MOV R7,A

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