HTG12B0 datasheet(22/33 Pages) HOLTEK

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DEC [R3R2]

Decrement data memory

Machine Code

00001111

Description

Data in the data memory specified by the register pair ²R3, R2² is decre-

mented by one. Carry flag is not affected.

Operation

M(R3,R2) ¬ M(R3,R2)-1

Disable interrupt

Machine Code

00100101

00000011

Description

Internal time-out interrupt and external interrupt are disabled.

Enable interrupt

Machine Code

00100101

00000010

Description

Internal time-out interrupt and external interrupt are enabled.

HALT

Halt system clock

Machine Code

00110111

00111110

Description

Turn off system clock, and enter power down mode.

Operation

PC ¬ (PC)+1

IN A,Pi

Input port to accumulator

Machine Code

00101100 PA

01001000 PB

00110010 PM

00110011 PS

Description

The data on port ²Pi² is transferred to the accumulator.

Operation

ACC ¬ Pi; Pi=PA, PB, PM or PS

INC A

Increment accumulator

Machine Code

00110001

Description

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

Operation

ACC ¬ ACC+1

INC Rn

Increment register

Machine Code

0001nnn0

Description

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

not affected.

Operation

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

HTG12B0

September 8, 1999

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