Intel MCS-51

Opcodes

Bits Address

Direct Address

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Opcodes

- 0x00 = NOP
- 0x01 = AJMP addr11
- 0x02 = LJMP addr16
- 0x03 = RR A
- 0x04 = INC A
- 0x05 = INC direct
- 0x06 = INC @R0
- 0x07 = INC @R1
- 0x08 = INC R0
- 0x09 = INC R1
- 0x0A = INC R2
- 0x0B = INC R3
- 0x0C = INC R4
- 0x0D = INC R5
- 0x0E = INC R6
- 0x0F = INC R7
- 0x10 = JBC bit, offset
- 0x11 = ACALL addr11
- 0x12 = LCALL addr16
- 0x13 = RRC A
- 0x14 = DEC A
- 0x15 = DEC direct
- 0x16 = DEC @R0
- 0x17 = DEC @R1
- 0x18 = DEC R0
- 0x19 = DEC R1
- 0x1A = DEC R2
- 0x1B = DEC R3
- 0x1C = DEC R4
- 0x1D = DEC R5
- 0x1E = DEC R6
- 0x1F = DEC R7
- 0x20 = JB bit, offset
- 0x21 = AJMP addr11
- 0x22 = RET
- 0x23 = RL A
- 0x24 = ADD A, immediate
- 0x25 = ADD A, direct
- 0x26 = ADD A, @R0
- 0x27 = ADD A, @R1
- 0x28 = ADD A, R0
- 0x29 = ADD A, R1
- 0x2A = ADD A, R2
- 0x2B = ADD A, R3
- 0x2C = ADD A, R4
- 0x2D = ADD A, R5
- 0x2E = ADD A, R6
- 0x2F = ADD A, R7
- 0x30 = JNB bit, offset
- 0x31 = ACALL addr11
- 0x32 = RETI
- 0x33 = RLC A
- 0x34 = ADDC A, immediate
- 0x35 = ADDC A, direct
- 0x36 = ADDC A, @R0
- 0x37 = ADDC A, @R1
- 0x38 = ADDC A, R0
- 0x39 = ADDC A, R1
- 0x3A = ADDC A, R2
- 0x3B = ADDC A, R3
- 0x3C = ADDC A, R4
- 0x3D = ADDC A, R5
- 0x3E = ADDC A, R6
- 0x3F = ADDC A, R7
- 0x40 = JC offset // Jump if carry set (CY)
- 0x41 = AJMP addr11
- 0x42 = ORL direct, A
- 0x43 = ORL direct, immediate
- 0x44 = ORL A, immediate
- 0x45 = ORL A, direct
- 0x46 = ORL A, @R0
- 0x47 = ORL A, @R1
- 0x48 = ORL A, R0
- 0x49 = ORL A, R1
- 0x4A = ORL A, R2
- 0x4B = ORL A, R3
- 0x4C = ORL A, R4
- 0x4D = ORL A, R5
- 0x4E = ORL A, R6
- 0x4F = ORL A, R7
- 0x50 = JNC offset // Jump if carry not set (CY)
- 0x51 = ACALL addr11
- 0x52 = ANL direct, A
- 0x53 = ANL direct, immediate
- 0x54 = ANL A, immediate
- 0x55 = ANL A, direct
- 0x56 = ANL A, @R0
- 0x57 = ANL A, @R1
- 0x58 = ANL A, R0
- 0x59 = ANL A, R1
- 0x5A = ANL A, R2
- 0x5B = ANL A, R3
- 0x5C = ANL A, R4
- 0x5D = ANL A, R5
- 0x5E = ANL A, R6
- 0x5F = ANL A, R7
- 0x60 = JZ offset // Jump if A = 0
- 0x61 = AJMP addr11
- 0x62 = XRL direct, A
- 0x63 = XRL direct, immediate
- 0x64 = XRL A, immediate
- 0x65 = XRL A, direct
- 0x66 = XRL A, @R0
- 0x67 = XRL A, @R1
- 0x68 = XRL A, R0
- 0x69 = XRL A, R1
- 0x6A = XRL A, R2
- 0x6B = XRL A, R3
- 0x6C = XRL A, R4
- 0x6D = XRL A, R5
- 0x6E = XRL A, R6
- 0x6F = XRL A, R7
- 0x70 = JNZ offset // Jump if A != 0
- 0x71 = ACALL addr11
- 0x72 = ORL C, bit
- 0x73 = JMP @A+DPTR
- 0x74 = MOV A, immediate
- 0x75 = MOV direct, immediate
- 0x76 = MOV @R0, immediate
- 0x77 = MOV @R1, immediate
- 0x78 = MOV R0, immediate
- 0x79 = MOV R1, immediate
- 0x7A = MOV R2, immediate
- 0x7B = MOV R3, immediate
- 0x7C = MOV R4, immediate
- 0x7D = MOV R5, immediate
- 0x7E = MOV R6, immediate
- 0x7F = MOV R7, immediate
- 0x80 = SJMP offset
- 0x81 = AJMP addr11
- 0x82 = ANL C, bit
- 0x83 = MOVC A,@A+PC
- 0x84 = DIV AB
- 0x85 = MOV direct, direct
- 0x86 = MOV direct, @R0
- 0x87 = MOV direct, @R1
- 0x88 = MOV direct, R0
- 0x89 = MOV direct, R1
- 0x8A = MOV direct, R2
- 0x8B = MOV direct, R3
- 0x8C = MOV direct, R4
- 0x8D = MOV direct, R5
- 0x8E = MOV direct, R6
- 0x8F = MOV direct, R7
- 0x90 = MOV DPTR, immediate word
- 0x91 = ACALL addr11
- 0x92 = MOV bit, C
- 0x93 = MOVC A,@A+DPTR
- 0x94 = SUBB A, immediate
- 0x95 = SUBB A, direct
- 0x96 = SUBB A, @R0
- 0x97 = SUBB A, @R1
- 0x98 = SUBB A, R0
- 0x99 = SUBB A, R1
- 0x9A = SUBB A, R2
- 0x9B = SUBB A, R3
- 0x9C = SUBB A, R4
- 0x9D = SUBB A, R5
- 0x9E = SUBB A, R6
- 0x9F = SUBB A, R7
- 0xA0 = ORL C, !bit
- 0xA1 = AJMP addr11
- 0xA2 = MOV C, bit
- 0xA3 = INC DPTR
- 0xA4 = MUL AB
- 0xA5 = reserved
- 0xA6 = MOV @R0, direct
- 0xA7 = MOV @R1, direct
- 0xA8 = MOV R0, direct
- 0xA9 = MOV R1, direct
- 0xAA = MOV R2, direct
- 0xAB = MOV R3, direct
- 0xAC = MOV R4, direct
- 0xAD = MOV R5, direct
- 0xAE = MOV R6, direct
- 0xAF = MOV R7, direct
- 0xB0 = ANL C, !bit
- 0xB1 = ACALL addr11
- 0xB2 = CPL bit
- 0xB3 = CPL C
- 0xB4 = CJNE A, immediate, offset
- 0xB5 = CJNE A, direct, offset
- 0xB6 = CJNE @R0, immediate, offset
- 0xB7 = CJNE @R1, immediate, offset
- 0xB8 = CJNE R0, immediate, offset
- 0xB9 = CJNE R1, immediate, offset
- 0xBA = CJNE R2, immediate, offset
- 0xBB = CJNE R3, immediate, offset
- 0xBC = CJNE R4, immediate, offset
- 0xBD = CJNE R5, immediate, offset
- 0xBE = CJNE R6, immediate, offset
- 0xBF = CJNE R7, immediate, offset
- 0xC0 = PUSH direct
- 0xC1 = AJMP addr11
- 0xC2 = CLR bit
- 0xC3 = CLR C
- 0xC4 = SWAP A
- 0xC5 = XCH A, direct
- 0xC6 = XCH A, @R0
- 0xC7 = XCH A, @R1
- 0xC8 = XCH A, R0
- 0xC9 = XCH A, R1
- 0xCA = XCH A, R2
- 0xCB = XCH A, R3
- 0xCC = XCH A, R4
- 0xCD = XCH A, R5
- 0xCE = XCH A, R6
- 0xCF = XCH A, R7
- 0xD0 = POP direct
- 0xD1 = ACALL addr11
- 0xD2 = SETB bit
- 0xD3 = SETB C
- 0xD4 = DA
- 0xD5 = DJNZ direct, offset
- 0xD6 = XCHD A,@R0
- 0xD7 = XCHD A,@R1
- 0xD8 = DJNZ R0, offset
- 0xD9 = DJNZ R1, offset
- 0xDA = DJNZ R2, offset
- 0xDB = DJNZ R3, offset
- 0xDC = DJNZ R4, offset
- 0xDD = DJNZ R5, offset
- 0xDE = DJNZ R6, offset
- 0xDF = DJNZ R7, offset
- 0xE0 = MOVX A, @DPTR
- 0xE1 = AJMP addr11
- 0xE2 = MOVX A, @R0
- 0xE3 = MOVX A, @R1
- 0xE4 = CLR A
- 0xE5 = MOV A, direct
- 0xE6 = MOV A, @R0
- 0xE7 = MOV A, @R1
- 0xE8 = MOV A, R0
- 0xE9 = MOV A, R1
- 0xEA = MOV A, R2
- 0xEB = MOV A, R3
- 0xEC = MOV A, R4
- 0xED = MOV A, R5
- 0xEE = MOV A, R6
- 0xEF = MOV A, R7

- 0xF0 = MOVX @DPTR, A
- 0xF1 = ACALL addr11
- 0xF2 = MOVX @R0, A
- 0xF3 = MOVX @R1, A
- 0xF4 = CPL A
- 0xF5 = MOV direct, A
- 0xF6 = MOV @R0, A
- 0xF7 = MOV @R1, A
- 0xF8 = MOV R0, A
- 0xF9 = MOV R1, A
- 0xFA = MOV R2, A
- 0xFB = MOV R3, A
- 0xFC = MOV R4, A
- 0xFD = MOV R5, A
- 0xFE = MOV R6, A
- 0xFF = MOV R7, A

Bits Address

0x00 = IRAM[0x20].0
0x01 = IRAM[0x20].1
0x02 = IRAM[0x20].2
0x03 = IRAM[0x20].3
0x04 = IRAM[0x20].4
0x05 = IRAM[0x20].5
0x06 = IRAM[0x20].6
0x07 = IRAM[0x20].7
0x08 = IRAM[0x21].0
0x09 = IRAM[0x21].1
0x0A = IRAM[0x21].2
0x0B = IRAM[0x21].3
0x0C = IRAM[0x21].4
0x0D = IRAM[0x21].5
0x0E = IRAM[0x21].6
0x0F = IRAM[0x21].7
0x10 = IRAM[0x22].0
0x11 = IRAM[0x22].1
0x12 = IRAM[0x22].2
0x13 = IRAM[0x22].3
0x14 = IRAM[0x22].4
0x15 = IRAM[0x22].5
0x16 = IRAM[0x22].6
0x17 = IRAM[0x22].7
0x18 = IRAM[0x23].0
0x19 = IRAM[0x23].1
0x1A = IRAM[0x23].2
0x1B = IRAM[0x23].3
0x1C = IRAM[0x23].4
0x1D = IRAM[0x23].5
0x1E = IRAM[0x23].6
0x1F = IRAM[0x23].7
0x20 = IRAM[0x24].0
0x21 = IRAM[0x24].1
0x22 = IRAM[0x24].2
0x23 = IRAM[0x24].3
0x24 = IRAM[0x24].4
0x25 = IRAM[0x24].5
0x26 = IRAM[0x24].6
0x27 = IRAM[0x24].7
0x28 = IRAM[0x25].0
0x29 = IRAM[0x25].1
0x2A = IRAM[0x25].2
0x2B = IRAM[0x25].3
0x2C = IRAM[0x25].4
0x2D = IRAM[0x25].5
0x2E = IRAM[0x25].6
0x2F = IRAM[0x25].7
0x30 = IRAM[0x26].0
0x31 = IRAM[0x26].1
0x32 = IRAM[0x26].2
0x33 = IRAM[0x26].3
0x34 = IRAM[0x26].4
0x35 = IRAM[0x26].5
0x36 = IRAM[0x26].6
0x37 = IRAM[0x26].7
0x38 = IRAM[0x27].0
0x39 = IRAM[0x27].1
0x3A = IRAM[0x27].2
0x3B = IRAM[0x27].3
0x3C = IRAM[0x27].4
0x3D = IRAM[0x27].5
0x3E = IRAM[0x27].6
0x3F = IRAM[0x27].7
0x40 = IRAM[0x28].0
0x41 = IRAM[0x28].1
0x42 = IRAM[0x28].2
0x43 = IRAM[0x28].3
0x44 = IRAM[0x28].4
0x45 = IRAM[0x28].5
0x46 = IRAM[0x28].6
0x47 = IRAM[0x28].7
0x48 = IRAM[0x29].0
0x49 = IRAM[0x29].1
0x4A = IRAM[0x29].2
0x4B = IRAM[0x29].3
0x4C = IRAM[0x29].4
0x4D = IRAM[0x29].5
0x4E = IRAM[0x29].6
0x4F = IRAM[0x29].7
0x50 = IRAM[0x2A].0
0x51 = IRAM[0x2A].1
0x52 = IRAM[0x2A].2
0x53 = IRAM[0x2A].3
0x54 = IRAM[0x2A].4
0x55 = IRAM[0x2A].5
0x56 = IRAM[0x2A].6
0x57 = IRAM[0x2A].7
0x58 = IRAM[0x2B].0
0x59 = IRAM[0x2B].1
0x5A = IRAM[0x2B].2
0x5B = IRAM[0x2B].3
0x5C = IRAM[0x2B].4
0x5D = IRAM[0x2B].5
0x5E = IRAM[0x2B].6
0x5F = IRAM[0x2B].7
0x60 = IRAM[0x2C].0
0x61 = IRAM[0x2C].1
0x62 = IRAM[0x2C].2
0x63 = IRAM[0x2C].3
0x64 = IRAM[0x2C].4
0x65 = IRAM[0x2C].5
0x66 = IRAM[0x2C].6
0x67 = IRAM[0x2C].7
0x68 = IRAM[0x2D].0
0x69 = IRAM[0x2D].1
0x6A = IRAM[0x2D].2
0x6B = IRAM[0x2D].3
0x6C = IRAM[0x2D].4
0x6D = IRAM[0x2D].5
0x6E = IRAM[0x2D].6
0x6F = IRAM[0x2D].7
0x70 = IRAM[0x2E].0
0x71 = IRAM[0x2E].1
0x72 = IRAM[0x2E].2
0x73 = IRAM[0x2E].3
0x74 = IRAM[0x2E].4
0x75 = IRAM[0x2E].5
0x76 = IRAM[0x2E].6
0x77 = IRAM[0x2E].7
0x78 = IRAM[0x2F].0
0x79 = IRAM[0x2F].1
0x7A = IRAM[0x2F].2
0x7B = IRAM[0x2F].3
0x7C = IRAM[0x2F].4
0x7D = IRAM[0x2F].5
0x7E = IRAM[0x2F].6
0x7F = IRAM[0x2F].7
0x80 = P0.0
0x81 = P0.1
0x82 = P0.2
0x83 = P0.3
0x84 = P0.4
0x85 = P0.5
0x86 = P0.6
0x87 = P0.7
0x88 = TCON.0/IT0 (Interrupt-0 type control bit)
0x89 = TCON.1/IE0 (Interrupt-0 type edge flag)
0x8A = TCON.2/IT1 (Interrupt-1 type control bit)
0x8B = TCON.3/IE1 (Interrupt-1 type edge flag)
0x8C = TCON.4/TR0 (Timer-0 run control bit)
0x8D = TCON.5/TF0 (Timer-0 overflow flag)
0x8E = TCON.6/TR1 (Timer-1 run control bit)
0x8F = TCON.7/TF1 (Timer-1 overflow flag)
0x90 = P1.0
0x91 = P1.1
0x92 = P1.2
0x93 = P1.3
0x94 = P1.4
0x95 = P1.5
0x96 = P1.6
0x97 = P1.7
0x98 = SCON.0/RI (Receive Interrupt Flag)
0x99 = SCON.1/TI (Transmit Interrupt Flag)
0x9A = SCON.2/RB8 (RX bit 8)
0x9B = SCON.3/TB8 (TX bit 8)
0x9C = SCON.4/REN (Receive Enable)
0x9D = SCON.5/SM2 (Serial Mode)
0x9E = SCON.6/SM1 (Serial Mode)
0x9F = SCON.7/SM0 (Serial Mode)
0xA0 = P2.0
0xA1 = P2.1
0xA2 = P2.2
0xA3 = P2.3
0xA4 = P2.4
0xA5 = P2.5
0xA6 = P2.6
0xA7 = P2.7
0xA8 = IE.0/EX0 (External interrupt 0 enable bit)
0xA9 = IE.1/ET0 (Timer 0 interrupt enable bit)
0xAA = IE.2/EX1 (External interrupt 1 enable bit)
0xAB = IE.3/ET1 (Timer 1 interrupt enable bit)
0xAC = IE.4/ES (Serial Port interrupt enable bit)
0xAD = IE.5/ET2 (Timer 2 interrupt enable bit)
0xAE = IE.6
0xAF = IE.7/EA (Enable all interrupt)
0xB0 = P3.0
0xB1 = P3.1
0xB2 = P3.2
0xB3 = P3.3
0xB4 = P3.4
0xB5 = P3.5
0xB6 = P3.6
0xB7 = P3.7
0xB8 = IP.0/PX0 (External interrupt 0 priority bit)
0xB9 = IP.1/PT0 (Timer 0 priority bit)
0xBA = IP.2/PX1 (External interrupt 1 priority bit)
0xBB = IP.3/PT1 (Timer 1 priority bit)
0xBC = IP.4/PS (Serial Port priority bit)
0xBD = IP.5/PT2 (Timer 2 priority bit)
0xBE = IP.6
0xBF = IP.7
0xC0 =
0xC1 =
0xC2 =
0xC3 =
0xC4 =
0xC5 =
0xC6 =
0xC7 =
0xC8 =
0xC9 =
0xCA =
0xCB =
0xCC =
0xCD =
0xCE =
0xCF =
0xD0 = PSW.0/P
0xD1 = PSW.1
0xD2 = PSW.2/OV (Over Flow)
0xD3 = PSW.3/RS0
0xD4 = PSW.4/RS1
0xD5 = PSW.5/F0
0xD6 = PSW.6/AC (Aux. Carry)
0xD7 = PSW.7/CY (Carry)
0xD8 =
0xD9 =
0xDA =
0xDB =
0xDC =
0xDD =
0xDE =
0xDF =
0xE0 = ACC.0
0xE1 = ACC.1
0xE2 = ACC.2
0xE3 = ACC.3
0xE4 = ACC.4
0xE5 = ACC.5
0xE6 = ACC.6
0xE7 = ACC.7
0xE8 =
0xE9 =
0xEA =
0xEB =
0xEC =
0xED =
0xEE =
0xEF =
0xF0 = B.0
0xF1 = B.1
0xF2 = B.2
0xF3 = B.3
0xF4 = B.4
0xF5 = B.5
0xF6 = B.6
0xF7 = B.7
0xF8 =
0xF9 =
0xFA =
0xFB =
0xFC =
0xFD =
0xFE =
0xFF =

Direct Address

0x00 = IRAM[0x00]
0x01 = IRAM[0x01]
0x02 = IRAM[0x02]
0x03 = IRAM[0x03]
0x04 = IRAM[0x04]
0x05 = IRAM[0x05]
0x06 = IRAM[0x06]
0x07 = IRAM[0x07]
0x08 = IRAM[0x08]
0x09 = IRAM[0x09]
0x0A = IRAM[0x0A]
0x0B = IRAM[0x0B]
0x0C = IRAM[0x0C]
0x0D = IRAM[0x0D]
0x0E = IRAM[0x0E]
0x0F = IRAM[0x0F]

0284491708a.n. IRVAN PRATAMA RUSADA

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