NT6881 データシートの表示（PDF） - Novatek Microelectronics

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NT6881

USB Keyboard Micro-Controller

Novatek Microelectronics 

2.Instruction Set List

Instruction Code

Meaning

ADC

Add with carry

AND

Logical AND

ASL

Shift left one bit

BCC

Branch if carry clear

BCS

Branch if carry set

BEQ

Branch if equal to zero

BIT

Bit test

BMI

Branch if minus

BNE

Branch if not equal to zero

BPL

Branch if plus

BRK

Break

BVC

Branch if overflow clear

BVS

Branch if overflow set

CLC

Clear carry

CLD

Clear decimal mode

CLI

Clear interrupt disable bit

CLV

Clear overflow

CMP

Compare accumulator to memory

CPX

Compare with index register X

CPY

Compare with index register Y

DEC

Decrement memory by one

DEX

Decrement index X by one

DEY

Decrement index Y by one

EOR

Logical exclusive-OR

INC

Increment memory by one

INX

Increment index X by one

INY

Increment index Y by one

JMP

Jump to new location

JSR

Jump to subroutine

NT68P81

Operation

A + M + C → A，C

A•M → A

C ← M7•••M0 ← 0

Branch on C＝0

Branch on C＝1

Branch on Z＝1

A•M，M7 → N，M6 → V

Branch on N＝1

Branch on Z＝0

Branch on N＝0

Forced interrupt PC + 2↓ PC↓

Branch on V＝0

Branch on V＝1

0→ C

0→ D

0→ I

0→ V

A－M

X－ M

Y－M

M－1→M

X－ 1 → X

Y－1→Y

A ⊕ M→A

M+1 → M

X+1→ X

Y+1 → Y

(PC + 1) → PCL，(PC + 2) → PCH

PC + 2↓，(PC + 1) → PCL，(PC + 2) → PCH

6

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