CD00001237 datasheet(59/105 Pages) STMICROELECTRONICS

59 / 105 page

ST6215C ST6225C

59/105

INSTRUCTION SET (Cont’d)

Arithmetic and Logic. These instructions are

used to perform arithmetic calculations and logic

operations. In AND, ADD, CP, SUB instructions

one operand is always the accumulator while, de-

pending on the addressing mode, the other can be

either a data space memory location or an imme-

diate value. In CLR, DEC, INC instructions the op-

erand can be any of the 256 data space address-

es. In COM, RLC, SLA the operand is always the

accumulator.

Table 17. Arithmetic & Logic Instructions

Notes:

X,Y

Index Registers

V, W Short Direct Registers

Affected

Immediate data (stored in ROM memory)

Not Affected

rr Data space register

Instruction

Addressing Mode

Bytes

Cycles

Flags

ADD A, (X)

Indirect

ΔΔ

ADD A, (Y)

Indirect

ΔΔ

ADD A, rr

Direct

ΔΔ

ADDI A, #N

Immediate

ΔΔ

AND A, (X)

Indirect

ΔΔ

AND A, (Y)

Indirect

ΔΔ

AND A, rr

Direct

ΔΔ

ANDI A, #N

Immediate

ΔΔ

CLR A

Short Direct

ΔΔ

CLR r

Direct

COM A

Inherent

ΔΔ

CP A, (X)

Indirect

ΔΔ

CP A, (Y)

Indirect

ΔΔ

CP A, rr

Direct

ΔΔ

CPI A, #N

Immediate

ΔΔ

DEC X

Short Direct

DEC Y

Short Direct

DEC V

Short Direct

DEC W

Short Direct

DEC A

Direct

DEC rr

Direct

DEC (X)

Indirect

DEC (Y)

Indirect

INC X

Short Direct

INC Y

Short Direct

INC V

Short Direct

INC W

Short Direct

INC A

Direct

INC rr

Direct

INC (X)

Indirect

INC (Y)

Indirect

RLC A

Inherent

ΔΔ

SLA A

Inherent

ΔΔ

SUB A, (X)

Indirect

ΔΔ

SUB A, (Y)

Indirect

ΔΔ

SUB A, rr

Direct

ΔΔ

SUBI A, #N

Immediate

ΔΔ

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