UPD17P136ACT datasheet(116/292 Pages) NEC

116 / 292 page

CHAPTER 11 ARITHMETIC AND LOGIC UNIT (ALU)

11.6.2 “Not Equal to” Judgement

The “not equal to” judgement instruction (SKNE m, #n4) is used to determine if immediate data and the contents

of a location in data memory are not equal.

This instruction causes the next instruction to be skipped when the immediate data and the contents of data memory

are not equal.

Example

MOV

M1,

#1010B

SKNE

M1,

#1000B

; (1)

;

SKNE

M1,

#1010B

; (2)

In this example, because the contents of data memory M1 and immediate data 1000B in step number

(1) are not equal, the program branches to B. In step number (2), because the contents of data memory

M1 and immediate data 1010B are equal, the program branches to C.

11.6.3 “Greater Than or Equal to” Judgement

The “greater than or equal to” judgement instruction (SKGE m, #n4) is used to determine if the contents of a location

in data memory is a value greater than or equal to the value of the immediate data operand. If the value in data memory

is greater than or equal to that of the immediate data, this instruction causes the next instruction to be skipped.

Example

MOV

M1,

#1000B

SKGE

M1,

#0111B

; (1)

;

SKGE

M1,

#1000B

; (2)

;

SKGE

M1,

#1001B

; (3)

In this example, the program will first branch to B since the value in data memory is larger than that

of the immediate data. Next it will branch to D since the value in data memory is equal to that of the

immediate data. Last it will branch to E since the value in data memory is less than that of the immediate

data.

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