STC12LE5604 datasheet(89/377 Pages) STC

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ADD A,Rn

Bytes:

Cycles:

Encoding:

0 0 1 0

1 r r r

Operation:

ADD

(A)←(A) + (Rn)

←(A) + (Rn)

(A) + (Rn)

ADD A,direct

Bytes:

Cycles:

Encoding:

0 0 1 0

0 1 0 1

direct address

Operation:

ADD

(A)←(A) + (direct)

←(A) + (direct)

(A) + (direct)

ADD A,@Ri

Bytes:

Cycles:

Encoding:

0 0 1 0

0 1 1 i

Operation:

ADD

(A)←(A) + ((Ri))

←(A) + ((Ri))

(A) + ((Ri))

ADD A,#data

Bytes:

Cycles:

Encoding:

0 0 1 0

0 1 0 0

immediate data

Operation:

ADD

(A)←(A) + #data

←(A) + #data

(A) + #data

ADDC A,<src-byte>

Function:

Add with Carry

Description:

ADDC simultaneously adds the byte variable indicated, the Carry flag and the Accumulator,

leaving the result in the Accumulator. The carry and auxiliary-carry flags are set, respectively,

if there is a carry-out from bit 7 or bit 3, and cleared otherwise. When adding unsigned

integers, the carry flag indicates an overflow occured.

OV is set if there is a carry-out of bit 6 but not out of bit 7, or a carry-out of bit 7 but not

out of bit 6; otherwise OV is cleared. When adding signed integers, OV indicates a negative

number produced as the sum of two positive operands or a positive sum from two negative

operands.

Four source operand addressing modes are allowed: register, direct, register-indirect, or

immediate.

Example:

The Accumulator holds 0C3H(11000011B) and register 0 holds 0AAH (10101010B) with the

Carry. The instruction,

ADDC A,R0

will leave 6EH (01101101B) in the Accumulator with the AC flag cleared and both the carry

flag and OV set to 1.

STC12LE5604 Datasheet(PDF) 89 Page - STCmicro Technology Co,.Ltd

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