HT85F2270 datasheet(30/226 Pages) HOLTEK

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Standard 8051 8-Bit Flash MCU

HT85F2260/HT85F2270/HT85F2280

17 Arithmetic and Logic Unit – ALU

The arithmetic-logic unit or ALU is a critical area of the microcontroller that carries out arithmetic

and logic operations of the instruction set. Connected to the main microcontroller data bus,

the ALU receives related instruction codes and performs the required arithmetic or logical

operations after which the result will be placed in the specified register. As these ALU calculation

or operations may result in carry, borrow or other status changes, the status register will be

correspondingly updated to reflect these changes. The ALU supports the following functions:

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Arithmetic operations: ADD, ADDC, SUBB, DA, MUL, DIV

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Logic operations: ANL, ORL, XRL, CLR, CPL

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Rotation: RL, RLC, RR, RRC, SWAP

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Increment and Decrement: INC, DEC

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Branch decision: JC, JNC, JB, JNB, JBC, ACALL, LCALL, RET, RETI, AJMP, SJMP, JMP, JZ,

JNZ, CJNE, DJNZ

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