HTG12B0 datasheet(21/33 Pages) HOLTEK

21 / 33 page

CALL address

Subroutine call

Machine Code

1111aaaa

aaaaaaaa

Description

The program counter bits 0-11 are saved in the stack. The program coun-

ter is then loaded from the directly-specified address.

Operation

Stack ¬ PC+2

PC ¬ address

CLC

Clear carry flag

Machine Code

00101010

Description

The carry flag is reset to zero.

Operation

C ¬ 0

DAA

Decimal-Adjust accumulator

Machine Code

00110110

Description

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

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

is one.

Operation

If ACC>9 or CF=1 then

ACC ¬ ACC+6, C ¬ 1

else

ACC ¬ ACC, C ¬ C

DEC A

Decrement accumulator

Machine Code

00111111

Description

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

fected.

Operation

ACC ¬ ACC-1

DEC Rn

Decrement register

Machine Code

0001nnn1

Description

Data in the working register ²Rn² is decremented by one. Carry flag is

not affected.

Operation

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

DEC [R1R0]

Decrement data memory

Machine Code

00001101

Description

Data in the data memory specified by the register pair ²R1,R0² is decre-

mented by one. Carry flag is not affected.

Operation

M(R1, R0) ¬ M(R1,R0)-1

HTG12B0

September 8, 1999

HTG12B0 数据表(PDF) 21 Page - Holtek Semiconductor Inc

HTG12B0 数据表(HTML) 21 Page - Holtek Semiconductor Inc

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HTG12B0 数据表(PDF) 21 Page - Holtek Semiconductor Inc

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