NT6881 Ver la hoja de datos (PDF) - Novatek Microelectronics

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NT6881

USB Keyboard Micro-Controller

Novatek Microelectronics 

Instruction Set List (contiuned)

Instruction Code

Meaning

LDA

Load accumulator with memory

LDX

Load index register X with memory

LDY

Load index register Y with memory

LSR

Shift right one bit

NOP

No operation

ORA

Logical OR

PHA

Push accumulator on stack

PHP

Push status register on stack

PLA

Pull accumulator from stack

PLP

Pull status register from stack

ROL

Rotate left through carry

ROR

Rotate right through carry

RTI

Return from interrupt

RTS

Return from subroutine

SBC

Subtract with borrow

SEC

Set carry

SED

Set decimal mode

SEI

Set interrupt disable status

STA

Store accumulator in memory

STX

Store index register X in memory

STY

Store index register Y in memory

TAX

Transfer accumulator to index X

TAY

Transfer accumulator to index Y

TSX

Transfer stack pointer to index X

TXA

Transfer index X to accumulator

TXS

Transfer index X to stack pointer

TYA

Transfer index Y to accumulator

Operation

M→A

M→X

M→Y

0 → M7•••M0 → C

No operation (2 cycles)

A+M→A

A↓

P↓

A↑

P↑

C ← M7•••M0 ← C

C → M7•••M0 → C

P ↑，PC ↑

PC ↑，PC+1 → PC

A － M － C → A，C

1→ C

1→ D

1→ I

A →M

X →M

Y →M

A→X

A→Y

S→X

X→ A

X→ S

Y→A

*For more detailed specifications, please refer to 6502 programming data book.

NT68P81

7

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