16bit and 32bit unsigned data comparison

Relational operators (Unsigned operations) for 16Bit(Word) and 32Bit(Double word) Data

Relational operators compare two values or strings to provide a true and false result.

If the comparison is true, the result is 1. (Instruction will carry on)

If the comparison is false, the result is 0. (Instruction will no carry on)


S1	Value to compare
S2	Value to compare

Instruction

Device address

No. of Steps

Flag

M

X

Y

K

L

F

T

C

S

Z

D

@D

Int.

Error

Zero

Carry

UCMP

UDCMP

S1

o

-

o

3

o

-

S2

o

-

o

-

o

UCMP

Functions

Compare two values S1 and S2 and if the comparison is true then set the Flag (F120~125) to 1.

S1 and S2 are unsigned number.

S1 =, <, >, <=, >=, <> S2 → Flag (F120~125)

Comparison	Operator	Flag
< Less than	S1 < S2	F120
<= Less than or equal	S1 <= S2	F121
= equal to	S1 = S2	F122
> Greater than	S1 > S2	F123
>= Greater than or equal	S1 >= S2	F124
<> Not equal	S1 ≠ S2	F125

Example)

If M00 is ON and D100 is less than D90 then Y10 will be turned ON.

UDCMP

Functions

Compare four values (double words) S1, S1+1 and S2, S2+1 and if the comparison is true then set the Flag (F120~125) to 1.

S1, S1+1 and S2, S2+1 are unsigned number.

(S1, S1+1) =, <, >, <=, >=, <> (S2, S2+1) → Flag (F120~125)

Comparison	Operator	Flag
< Less than	S1 < S2	F120
<= Less than or equal	S1 <= S2	F121
= equal to	S1 = S2	F122
> Greater than	S1 > S2	F123
>= Greater than or equal	S1 >= S2	F124
<> Not equal	S1 ≠ S2	F125

Example)

If M00 is ON and D100 and D101 are greater than D90 and D91 then Y11 will be turned ON.