HTG13J0 查看數據表（PDF） - Holtek Semiconductor

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HTG13J0

4-Bit Microcontroller

Holtek Semiconductor 

CALL address

Machine Code

Description

Operation

CLC

Machine Code

Description

Operation

DAA

Machine Code

Description

Operation

DEC A

Machine Code

Description

Operation

DEC Rn

Machine Code

Description

Operation

DEC [R1R0]

Machine Code

Description

Operation

HT13J0

Subroutine call

1111aaaa aaaaaaaa

The program counter bits 0 1 1 are saved in the stack. The program coun-

ter is then loaded from the directly-specified address.

Stack ¬ PC+2

PC ¬ address

Clear carry flag

00101010

The carry flag is reset to 0

C¬0

Decimal Adjust accumulator

00110110

The accumulator value is adjusted to the BCD (Binary Code Decimal)

code, if the contents of the accumulator is greater than 9 or C (Carry flag)

is 1.

If ACC>9 or CF=1 then

ACC ¬ ACC+6, C ¬ 1

else

ACC ¬ ACC, C ¬ C

Decrement accumulator

00111111

Data in the accumulator is decremented by 1. Carry flag is not affected.

ACC ¬ ACC 1

Decrement register

0001nnn1

Data in the working register "Rn" is decremented by 1. Carry flag is not

affected.

Rn ¬ Rn 1; Rn=R0, R1, R2, R3, R4, for n=0, 1, 2, 3, 4

Decrement data memory

00001101

Data in the data memory specified by the register pair "R1,R0" is decre-

mented by 1. Carry flag is not affected.

M(R1,R0) ¬ M(R1,R0) 1

19

May 19, 1999

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