HT68F14 HOLTEK [Holtek Semiconductor Inc], HT68F14 Datasheet - Page 18

• Manufacturer Part Number: HT68F14
• Description: Enhanced I/O Flash Type MCU
• Manufacturer: HOLTEK [Holtek Semiconductor Inc]

Rev. 1.10
Arithmetic and Logic Unit - ALU
If the stack is overflow, the first Program Counter save in the stack will be lost.
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, ADDM, ADC, ADCM, SUB, SUBM, SBC, SBCM, DAA
Logic operations: AND, OR, XOR, , ORM, XORM, CPL, CPLA
Rotation RRA, RR, RRCA, RRC, RLA, RL, RLCA, RLC
Increment and Decrement INCA, INC, DECA, DEC
Branch decision, JMP, SZ, SZA, SNZ, SIZ, SDZ, SIZA, SDZA, CALL, RET, RETI
HT68F13
HT68F14
HT68F15
Device
Stack Levels
4
4
8
18
Enhanced I/O Flash Type MCU
HT68F13/HT68F14/HT68F15
February 9, 2011