GMS81C50 datasheet(92/99 Pages) HYNIX

92 / 99 page

Appendix A. GMS800 Series Instruction

A-9

2. Register / Memory Operation

NO.

MNENONIC

CODE

BYTE

NO.

CYCLE

OPERATION

FLAG

NVGBHIZC

LDA #imm

Load accumulator

N - - - - - Z -

LDA dp

← (M)

LDA dp + X

LDA !abs

LDA !abs + Y

LDA [dp + X]

LDA [dp]+Y

LDA {X}

LDA {X}+

X-register auto-increment : A

← (M), X ← X + 1

LDM dp,#imm

Load memory with immediate data : (M)

← imm

- - - - - - - -

LDX #imm

Load X-register

N - - - - - Z -

LDX dp

← (M)

LDX dp + Y

LDX !abs

LDY #imm

Load X-register

N - - - - - Z -

LDY dp

← (M)

LDY dp + Y

LDY !abs

STA dp

Store accumulator contents in memory

- - - - - - - -

STA dp + X

(M)

← A

STA !abs

STA !abs + Y

STA [dp + X]

STA [dp] + Y

STA {X}

STA {X}+

X-register auto-increment : (M)

← A, X ← X + 1

STX dp

Store X-register contents in memory

- - - - - - - -

STX dp + Y

(M)

← X

STX !abs

STY dp

Store Y-register contents in memory

- - - - - - - -

STY dp + X

(M)

← Y

STY !abs

TAX

Transfer accumulator contents to X-register : X

← A

N - - - - - Z -

TAY

Transfer accumulator contents to Y-register : Y

← A

N - - - - - Z -

TSPX

Transfer stack-pointer contents to X-register : X

← SP

N - - - - - Z -

TXA

Transfer X-register contents to accumulator : A

← X

N - - - - - Z -

TXSP

Transfer X-register contents to stack-pointer : SP

← X

N - - - - - Z -

TYA

Transfer Y-register contents to accumulator : A

← Y

N - - - - - Z -

XAX

Exchange X-register contents with accumulator : X fA

- - - - - - - -

XAY

Exchange Y-register contents with accumulator : Y fA

- - - - - - - -

XMA dp

Exchange memory contents with accumulator

N - - - - - Z -

XMA dp + X

(M) f A

XMA {X}

XYX

Exchange X-register contents with Y-register : X f Y

- - - - - - - -

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