Sub Routine Calls Between Program Files

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

Sub Routine Calls Between Program Files: ECALL, ECALLP, SBRT, RET

 

Instruction

Device address

No. of Steps

Flag

M

X

Y

K

L

F

T

C

S

Z

D

@D

Int.

Error

Zero

Carry

ECALL (P)

ID

-

-

-

-

-

-

-

-

-

-

-

-

o

3

-

-

-

n

-

-

-

-

-

-

-

-

-

-

-

-

o

SBRT

n

-

-

-

-

-

-

-

-

-

-

-

-

o

1

-

-

-

RET

-

-

-

-

-

-

-

-

-

-

-

-

-

-

1

-

-

-

 

 

Functions

When the input condition for the ECALL ID No. n instruction is turned ON, it moves to the corresponding sub routine ID program and executes the called operations between SBRT n and RET inside the sub routine program according to the ECALL ID No. n instruction. 

ECALL ID No. n can be used by nesting.

The SBRT n and RET program must have the number corresponding to the ECALL ID No. n.

 

Conditions processed as an error:

When a value of n is entered other than 0 ~ 127.

When the ECALL ID No. n instruction exists without the corresponding program file.

When the SBRT n or the RET instruction stands alone.

 

It is possible to CALL or ECALL another SBRT within a SBRT.

 

Example)

When the input condition (M02) for the ECALL 3 (Program ID) 2 (Sub Routine) is turned ON, it moves to the corresponding sub routine program ID ‘3’ and executes the called operations between the SBRT 2 and the RET according to the ECALL 3 2 instruction.