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HT85F2270 Datasheet(PDF) 30 Page - Holtek Semiconductor Inc |
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HT85F2270 Datasheet(HTML) 30 Page - Holtek Semiconductor Inc |
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30 / 226 page  Rev. 1.00 �0 of ��6 �a� 1�� �01� 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: ■ Arithmetic operations: ADD, ADDC, SUBB, DA, MUL, DIV ■ Logic operations: ANL, ORL, XRL, CLR, CPL ■ Rotation: RL, RLC, RR, RRC, SWAP ■ Increment and Decrement: INC, DEC ■ Branch decision: JC, JNC, JB, JNB, JBC, ACALL, LCALL, RET, RETI, AJMP, SJMP, JMP, JZ, JNZ, CJNE, DJNZ |
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