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HTG12N0

4-Bit Microcontroller

Holtek Semiconductor 

HTG12N0

Mnemonic

Rotate

RL A

RLC A

RR A

RRC A

Input & Output

IN A,Pi

OUT Pi,A

Branch

JMP addr

JC addr

JNC addr

JTMR addr

JAn addr

JZ A,addr

JNZ A,addr

JNZ Rn,addr

Subroutine

CALL addr

RET

RETI

Flag

CLC

STC

EI

DI

NOP

Timer

TIMER XXH

TIMER ON

TIMER OFF

MOV A,TMRL

MOV A,TMRH

MOV TMRL,A

MOV TMRH,A

Table Read

READ R4A

READ MR0A

READF R4A

READF MR0A

Description

Rotate ACC left

Rotate ACC left through the carry

Rotate ACC right

Rotate ACC right through the carry

Input port-i to ACC, port-i=PM0~PM2,PS

Output ACC to port-i, port-i=PC2~PC3, PA

Jump unconditionally

Jump on carry=1

Jump on carry=0

Jump on timer overflow

Jump on ACC bit n=1

Jump on ACC is zero

Jump on ACC is not zero

Jump on register Rn not zero, n=0,1,4

Subroutine call

Return from subroutine or interrupt

Return from interrupt service routine

Clear carry flag

Set carry flag

Enable interrupt

Disable interrupt

No operation

Set 8 bits immediate data to TIMER

Set TIMER start counting

Set TIMER stop counting

Move low nibble of TIMER to ACC

Move high nibble of TIMER to ACC

Move ACC to low nibble of TIMER

Move ACC to high nibble of TIMER

Read ROM code of current page to R4 and ACC

Read ROM code of current page to M(R1,R0), ACC

Read ROM code of page F to R4 and ACC

Read ROM code of page F to M(R1,R0),ACC

Byte Cycle CF

1

1

√

1

1

√

1

1

√

1

1

√

1

1

—

1

1

—

2

2

—

2

2

—

2

2

—

2

2

—

2

2

—

2

2

—

2

2

—

2

2

—

2

2

—

1

1

—

1

1

√

1

1

0

1

1

1

1

1

—

1

1

—

1

1

—

2

2

—

1

1

—

1

1

—

1

1

—

1

1

—

1

1

—

1

1

—

1

2

—

1

2

—

1

2

—

1

2

—

17

18th Mar ’99

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