ST6255CB6 datasheet(61/86 Pages) STMICROELECTRONICS

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ST62T55C ST62T65C/E65C

INSTRUCTION SET (Cont’d)

Arithmetic and Logic. These instructions are

used to perform the arithmetic calculations and

logic operations. In AND, ADD, CP, SUB instruc-

tions one operand is always the accumulator while

the other can be either a data space memory con-

tent or an immediate value in relation with the ad-

dressing mode. In CLR, DEC, INC instructions the

operand can be any of the 256 data space ad-

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

the accumulator.

Table 19. Arithmetic & Logic Instructions

Notes:

X,Y.Indirect Register Pointers, V & W Short Direct RegistersD. 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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