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HTG12N0

4-Bit Microcontroller

Holtek Semiconductor 

DEC [R3R2]

Machine Code

Description

Operation

DI

Machine Code

Description

EI

Machine Code

Description

HALT

Machine Code

Description

Operation

IN A,Pi

Machine Code

Description

Operation

INC A

Machine Code

Description

Operation

INC Rn

Machine Code

Description

Operation

INC [R1R0]

Machine Code

Description

Operation

HTG12N0

Decrement data memory

00001111

Data in the data memory specified by register pair “R3,R2” is decremented

by one. Carry flag is not affected.

M(R3,R2) ← M(R3,R2)–1

Disable interrupt

00101101

Internal time–out interrupt and external interrupt are disabled.

Enable interrupt

00101100

Internal time-out interrupt and external interrupt are enabled.

Halt system clock

00110111

00111110

Turn off system clock, and enter power down mode.

PC ← (PC)+1

Input port to accumulator

0 0 1 1 0 0 1 0 PM

0 0 1 1 0 0 1 1 PS

The data on port “Pi” is transferred to the accumulator.

ACC ← Pi; Pi=PM or PS

Increment accumulator

00110001

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

ACC ← ACC+1

Increment register

0001nnn0

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

affected.

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

Increment data memory

00001100

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

mented by one. Carry flag is not affected.

M(R1,R0) ← M(R1,R0)+1

21

18th Mar ’99

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