SCL

Owned by CIMON (Unlicensed)
Jul 06, 2023
3 min read

SCL, SCLP, DSCL, DSCLP

 

SCL instruction scales number of source according to condition of T and saves the scaled value to the Destination.

 

S

Source

D

Destination

P

Scale condition Table

n

Number of data to scale

 

 

Instruction

Device address

No. of Steps

Flag

M

X

Y

K

L

F

T

C

S

Z

D

@D

Int.

Error

Zero

Carry

SCL(P)

DSCL(P)

S

o

o

o

o

o

o

o

o

-

o

o

o

o

5

o

-

-

D

o

-

o

o

o

-

-

-

-

o

o

o

-

P

o

-

-

o

o

-

-

-

-

o

o

o

-

n

o

o

o

o

o

o

o

o

-

o

o

o

o

 

SCL

SCL instruction scales number of word source according to condition of P and saves the scaled value to the Destination.

Scale condition (P)

P

Minimum value of source to be scaled (Start Source)

P + 1

Maximum value of source to be scaled (Last Source)

P + 2

Scaled minimum value of destination (Start Dest.)

P + 3

Scaled maximum value of destination (Last Dest.)

 

DSCL

DSCL instruction scales number of double word source according to condition of P and saves the scaled value to the Destination.

Scale condition (P)

P, P + 1

Minimum value of source to be scaled (Start Source)

P + 2, P + 3

Maximum value of source to be scaled (Last Source)

P + 4, P + 5

Scaled minimum value of destination (Start Dest.)

P + 6, P + 7

Scaled maximum value of destination (Last Dest.)

 

Reference

Scale formula

Destination = Source x Gradient(2) + Offset(3)

 

Gradient =

 

Offset (Y intercept) = Last Dest. – Gradient(2) x Last source

 

Scale graph

 

 

Scale Range

  • If the source data is out of range, its value becomes the maximum and minimum value of Destination.

Source 1 is scaled to Starting value of destination and Source 2 is scaled to Last value of destination.

 

 

  • If the last source is less than starting source and the last destination is less than starting destination, its scaled value is opposite. (In case that Gradient has minus (-) value)

 

 

Example)

If X00 is ON, SCL instruction scales 10 words (D0~D9) according to scale condition (D200 to D203) and saves the scaled value to D100~D109.

 

 

 

 

 

  • Scale condition

D200

0 : minimum value of source

D201

160000 : maximum value of source

D202

1000 : minimum scaled value

D203

5000 : maximum scaled value