HTG12N0 datasheet(20/30 Pages) HOLTEK

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CALL address

Subroutine call

Machine Code

1 1 1 1 a a a a

a a a a a a a a

Description

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

counter is then loaded from the directly-specified address.

Operation

Stack

← PC+2

← address

CLC

Clear carry flag

Machine Code

0 0 1 0 1 0 1 0

Description

The carry flag is reset to zero.

Operation

← 0

DAA

Decimal–Adjust accumulator

Machine Code

0 0 1 1 0 1 1 0

Description

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 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

0 0 1 1 1 1 1 1

Description

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

Operation

ACC

← ACC–1

DEC Rn

Decrement register

Machine Code

0 0 0 1 n n n 1

Description

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

affected.

Operation

← Rn–1; Rn=R0,R1,R2,R3,R4, for nnn=0,1,2,3,4

DEC [R1R0]

Decrement data memory

Machine Code

0 0 0 0 1 1 0 1

Description

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

mented by one. Carry flag is not affected.

Operation

M(R1,R0)

← M(R1,R0)–1

HTG12N0

18th Mar ’99

HTG12N0 Scheda tecnica(PDF) 20 Page - Holtek Semiconductor Inc

HTG12N0 Scheda tecnica(HTML) 20 Page - Holtek Semiconductor Inc

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