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Addw – NEC 78K/0 Series User Manual

Page 64

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64

CHAPTER 5 EXPLANATION OF INSTRUCTIONS

User's Manual U12326EJ4V0UM

Add Word

ADDW

Word Data Addition

[Instruction format]

ADDW dst, src

[Operation]

dst, CY

dst + src

[Operand]

Mnemonic

Operand(dst,src)

ADDW

AX, #word

[Flag]

Z

AC

CY

Ч

Ч

Ч

[Description]

The destination operand (dst) specified by the 1st operand is added to the source operand (src) specified

by the 2nd operand and the result is stored in the destination operand (dst).

If the addition result shows that dst is 0, the Z flag is set (1). In all other cases, the Z flag is cleared (0).

If the addition generates a carry out of bit 15, the CY flag is set (1). In all other cases, the CY flag is cleared

(0).

As a result of addition, the AC flag becomes undefined.

[Description example]

ADDW AX, #ABCDH;

ABCDH is added to the AX register and the result is stored in the AX register.