D17133CS datasheet(224/289 Pages) NEC

224 / 289 page

CHAPTER 18

INSTRUCTION SET

209

MEM00C

MEM

0.0CH

MEM00D

MEM

0.0DH

MEM00E

MEM

0.0EH

MEM00F

MEM

0.0FH

SET2

CMP, Z

; CMP flag

← 1, Z flag ← 1

SUB

MEM000, MEM00C ; Contents for addresses 0.00H-0.03H do not change,

SUBC

MEM001, MEM00D ; because CMP flag is set

SUBC

MEM002, MEM00E ;

SUBC

MEM003, MEM00F ;

SKF1

; Z flag=1, if contents are the same; if not, Z flag=0

LAB1

;

LAB2

LAB1:

LAB2:

(4)

SUBC m, #n4

Subtract immediate data from data memory with carry flag

<1> OP code

10011

<2> Function

When CMP=0, (m)

← (m) – n4 – CY

Subtracts immediate data and the value of carry flag CY from the data memory contents, and stores the result

in data memory.

When CMP=1, (m) – n4 – CY

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 borrow occurs as a result of the subtraction. Resets the carry flag CY, if no borrow

occurs.

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

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