NT68P61A View Datasheet(PDF) - Novatek Microelectronics

Part Name

Description

Manufacturer

NT68P61A

8-Bit Microcontroller for Monitor (24K OTP ROM Type)

Novatek Microelectronics 

2. Instruction Set List

Instruction Code

ADC

AND

ASL

BCC

BCS

BEQ

BIT

BMI

BNE

BPL

BRK

BVC

BVS

CLC

CLD

CLI

CLV

CMP

CPX

CPY

DEC

DEX

DEY

EOR

INC

INX

INY

Meaning

Add with carry

Logical AND

Shift left one bit

Branch if carry clears

Branch if carry sets

Branch if equal to zero

Bit test

Branch if minus

Branch if not equal to zero

Branch if plus

Break

Branch if overflow clears

Branch if overflow sets

Clear carry

Clear decimal mode

Clear interrupt disable bit

Clear overflow

Compare accumulator to memory

Compare with index register X

Compare with index register Y

Decrement memory by one

Decrement index X by one

Decrement index Y by one

Logical exclusive-OR

Increment memory by one

Increment index X by one

Increment index Y by one

NT68P61A

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→J

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

6

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