Silicon Laboratories C8051F343 Manuel D’Utilisation

CIP-51 Instruction Set Summary, which includes the mnemonic, number of bytes, and number of clock 
cycles for each instruction.

The MOVX instruction is typically used to access external data memory (Note: the C8051F340/1/2/3/4/5/6/
7 does not support off-chip data or program memory). In the CIP-51, the MOVX write instruction is used to 
accesses external RAM (XRAM) and the on-chip program memory space implemented as re-programma-
ble Flash memory. The Flash access feature provides a mechanism for the CIP-51 to update program 
code and use the program memory space for non-volatile data storage. Refer to 

 for further details.

ADD A, Rn

Add register to A

1

1

ADD A, direct

Add direct byte to A

2

2

ADD A, @Ri

Add indirect RAM to A

1

2

ADD A, #data

Add immediate to A

2

2

ADDC A, Rn

Add register to A with carry

1

1

ADDC A, direct

Add direct byte to A with carry

2

2

ADDC A, @Ri

Add indirect RAM to A with carry

1

2

ADDC A, #data

Add immediate to A with carry

2

2

SUBB A, Rn

Subtract register from A with borrow

1

1

SUBB A, direct

Subtract direct byte from A with borrow

2

2

SUBB A, @Ri

Subtract indirect RAM from A with borrow

1

2

SUBB A, #data

Subtract immediate from A with borrow

2

2

INC A

Increment A

1

1

INC Rn

Increment register

1

1

INC direct

Increment direct byte

2

2

INC @Ri

Increment indirect RAM

1

2

DEC A

Decrement A

1

1

DEC Rn

Decrement register

1

1

DEC direct

Decrement direct byte

2

2

DEC @Ri

Decrement indirect RAM

1

2

INC DPTR

Increment Data Pointer

1

1

MUL AB

Multiply A and B

1

4

DIV AB

Divide A by B

1

8

DA A

Decimal adjust A

1

1

ANL A, Rn

AND Register to A

1

1

ANL A, direct

AND direct byte to A

2

2

ANL A, @Ri

AND indirect RAM to A

1

2

ANL A, #data

AND immediate to A

2

2

ANL direct, A

AND A to direct byte

2

2

ANL direct, #data

AND immediate to direct byte

3

3

ORL A, Rn

OR Register to A

1

1