DATE SUB

DATE-, DATE-P

DATE- instruction subtracts clock data S2 from S1 and saves the result to the Destination.


S1	Starting address of clock data
S2	Starting address of clock data
D	Destination

Instruction

Device address

No. of Steps

Flag

M

X

Y

K

L

F

T

C

S

Z

D

@D

Int.

Error

Zero

Carry

DATE-

DATE-P

S1

o

-

o

-

4

o

-

S2

o

-

o

-

D

o

-

o

-

o

-

o

-

When enabled, DATE- instruction subtracts clock date S2 from S1 and saves the result to the Destination.

If the result has (-)minus value, add 24 to the result.

For example, in case of 4:50:32 - 10:42:12, the result is 18:8:20. (Not -6:8:20)

If S1 and S2 are out or range, Error flag will be turned ON.

Example)

If X01 is ON, the DATERDP instruction writes a date value to D100 ~ D106 and then DATE-P instruction subtracts time data (D10~D12) from (D103~D105) and saves the result to the D200~D202.