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Appendix 6. Machine instructions

APPENDIX

7721 Group User’s Manual

17–50

Symbol

Functions

Details

IMP

IMM

DIR

DIR,b

DIR,X

DIR,Y

(DIR)

(DIR,X) (DIR),Y

op n

op nn

op n

Addressing modes

PLY

x=0

←S+1

←M(S)

←S+1

←M(S)

x=1

←S+1

←M(S)

Restores the contents of the stack on the index register Y.

M(S)

←A, B, X···

Saves the registers among accumulator, index register, direct

page register, data bank register, program bank register,

or processor status register, specified by the bit pattern of

the second byte of the instruction into the stack.

Restores the contents of the stack to the registers among

accumulator, index register, direct page register, data bank

pattern of the second byte of the instruction.

m=0

n bit rotate left

← b15 ··· b0 ←

m=1

n bit rotate left

← b7 ··· b0 ←

A, B, X···

←M(S)

PSH

(Note 6)

PUL

(Note 7)

RLA

(Note 13)

Rotates the contents of the accumulator A, n bits to the

left.

m=0

← b15 ··· b0 ← C ←

m=1

← b7 ··· b0 ← C ←

ROL

(Note 1)

Links the accumulator or the memory to C flag, and rotates

result to the left by 1 bit.

m=0

→ C → b15 ··· b0 →

m=1

→ C → b7 ··· b0 →

ROR

(Note 1)

Links the accumulator or the memory to C flag, and rotates

result to the right by 1 bit.

←S+1

PSL

←M(S)

←S+1

PSH

←M(S)

←S+1

PCL

←M(S)

←S+1

PCH

←M(S)

←S+1

←M(S)

←S+1

PCL

←M(S)

←S+1

PCH

←M(S)

←S+1

←M(S)

←S+1

PCL

←M(S)

←S+1

PCH

←M(S)

ACC, C

←ACC–M–C

RTI

RTL

RTS

SBC

(Notes 1,2)

Returns from the interruption routine.

Returns from the subroutine. The contents of the program

bank register are also restored.

Returns from the subroutine. The contents of the program

bank register are not restored.

Subtracts the contents of the memory and the borrow from

the contents of the accumulator.

60 51

40 11 1

6A 21 66 72

42 4 2

26 72

36 7 2

42 42

89 63

E5 4 2

F5 5 26

2 E1 7 2 F1

42 9

42 83

42 73

42 63

n #

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