HTG1390 データシートの表示（PDF） - Holtek Semiconductor

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HTG1390

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

Preliminary

HTG1390

Subroutine call

1111aaaa aaaaaaaa

The program counter bits 0~11 are saved in the stack and the specified ad-

dress loaded into the program counter.

Stack ← PC+2

PC ← address

Clear carry flag

00101010

The carry flag is reset to zero.

CF ← 0

Decimal-Adjust accumulator

00110110

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

contents of the accumulator is greater than 9 or CF (Carry flag) is one.

If ACC>9 or CF=1 then

ACC ← ACC+6, CF ← 1

else

ACC ← ACC, CF ← CF

Decrement accumulator

00111111

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

ACC ← ACC–1

Decrement register

0001nnn1

Data in the working register “Rn” is decremented by one. Carry flag is not

affected.

Rn ← Rn–1; Rn=R0,R1,R2,R3,R4, for nnn=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 one. Carry flag is not affected.

M(R1,R0) ← M(R1,R0)–1

17

17th Nov ’98

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