D17133CS datasheet(208/289 Pages) NEC

208 / 289 page

CHAPTER 18

INSTRUCTION SET

193

(2)

ADD m, #n4

Add immediate data to data memory

<1> OP code

10000

<2> Function

When CMP=0, (m)

← (m) + n4

Adds immediate data to the data memory contents, and stores the result in data memory.

When CMP=1, (m) + n4

The result is not stored in the data memory. Carry flag CY and zero flag Z are changed, according to the

result.

Sets carry flag CY, if a carry occurs as a result of the addition; resets the carry flag CY if no carry occurs.

If the addition result is other than zero, zero flag Z is reset, regardless of compare flag CMP.

If the addition result is zero with the compare flag reset (CMP=0), the zero flag Z is set.

If the addition result is zero with the compare flag set (CMP=1), the zero flag Z is not changed.

Addition can be executed in binary 4-bit or BCD. The BCD flag for the PSWORD specifies which kind of

addition is to be executed.

<3> Example 1

Adds 5 to the address 0.2FH contents, and stores the result in address 0.2FH:

(0.2FH)

← (0.2FH) + 5

MEM02F

MEM

0.2FH

ADD MEM02F, #05H

Example 2

Adds 5 to the address 0.6FH contents and stores the result in address 0.6FH. At this time, data memory

address 0.6FH can be specified by selecting data memory address 2FH, if IXE=1, IXH=0, IXM=4, and IXL=0,

i.e., IX=0.40H.

D17133CS Datasheet(PDF) 208 Page - NEC