D17133CS datasheet(225/289 Pages) NEC

225 / 289 page

CHAPTER 18

INSTRUCTION SET

210

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

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

Subtraction can be executed in binary or BCD. The BCD flag for program status word PSWORD specifies

which kind of subtraction is to be executed.

<3> Example 1

Subtracts 5 from the 12-bit contents for addresses 0.0DH through 0.0FH and stores the result in addresses

0.0DH through 0.0FH:

(0.0FH)

← (0.0FH) – 05H

(0.0EH)

← (0.0EH) – CY

(0.0DH)

← (0.0DH) – CY

MEM00D

MEM

0.0DH

MEM00E

MEM

0.0EH

MEM00F

MEM

0.0FH

SUB

MEM00F, #05H

SUBC

MEM00E, #00H

SUBC

MEM00D, #00H

Example 2

To subtract 5 from the 12-bit contents for addresses 0.4DH through 0.4FH and store the result in addresses

0.4DH through 0.4FH:

(0.4FH)

← (0.4FH) – 05H

(0.4EH)

← (0.4EH) – CY

(0.4DH)

← (0.4DH) – CY

MEM00D

MEM

0.0DH

MEM00E

MEM

0.0EH

MEM00F

MEM

0.0FH

MOV

BANK, #00H

; Data memory bank 0

MOV

IXH, #00H

; IX

← 00001000000B (0.40H)

MOV

IXM, #04H

;

MOV

IXL, #00H

;

SET1

IXE

; IXE flag

← 1

SUB

MEM00F, #5

; (0.4FH)

← (0.4FH) – 5

SUBC

MEM00E, #0

; (0.4EH)

← (0.4EH) – CY

SUBC

MEM00D, #0

; (0.4DH)

← (0.4DH) – CY

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