HT46R016 데이터 시트보기 (PDF) - Holtek Semiconductor

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HT46R016

Enhanced A/D Type 8-Bit OTP MCU

Holtek Semiconductor 

HT46R016/HT46R017

Enhanced A/D Type 8-Bit OTP MCU

4

Device

HT46R016

HT46R017

Stack Levels

2

4

If the stack is full and an enabled interrupt takes place, the interrupt request flag will be recorded but

the acknowledge signal will be inhibited. When the Stack Pointer is decremented, by RET or RETI,

the interrupt will be serviced. This feature prevents stack overflow allowing the programmer to use

the structure more easily. However, when the stack is full, a CALL subroutine instruction can still

be executed which will result in a stack overflow. Precautions should be taken to avoid such cases

which might cause unpredictable program branching.

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, ADDM, ADC, ADCM, SUB, SUBM, SBC, SBCM, DAA

●● Logic operations: AND, OR, XOR, ANDM, 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.

Rev. 1.00

14

July 16, 2012

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