ST6201CM-Auto datasheet(54/96 Pages) STMICROELECTRONICS

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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 16. 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

∆

ADD A, (Y)

Indirect

∆

ADD A, rr

Direct

∆

ADDI A, #N

Immediate

∆

AND A, (X)

Indirect

∆

AND A, (Y)

Indirect

∆

AND A, rr

Direct

∆

ANDI A, #N

Immediate

∆

CLR A

Short Direct

∆

CLR r

Direct

COM A

Inherent

∆

CP A, (X)

Indirect

∆

CP A, (Y)

Indirect

∆

CP A, rr

Direct

∆

CPI A, #N

Immediate

∆

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

∆

SLA A

Inherent

∆

SUB A, (X)

Indirect

∆

SUB A, (Y)

Indirect

∆

SUB A, rr

Direct

∆

SUBI A, #N

Immediate

∆

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