ST6391 datasheet(58/68 Pages) STMICROELECTRONICS

58 / 68 page

SOFTWARE DESCRIPTION (Continued)

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 accumulatorwhile

the other can be either a data space memory

content or an immediate value in relation with the

addressing mode. In CLR, DEC, INC instructions

the operand can be any of the 256 data space

addresses. In COM, RLC, SLA the operand is

always the accumulator. See Table 17.

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 rr

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

∆∆

Notes:

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

∆. Affected

# . Immediate data (stored in ROM memory)

* . Not Affected

rr.

Data space register

Table 17. Arithmetic & Logic Instructions

ST6391,92,93,95,97,99

54/64

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