Common Information For Subroutine Instructions - Panasonic FP7 Series Command Reference Manual

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3.34 Common Information for Subroutine Instructions

Program configuration

● Subroutine instructions are configured from a subroutine call instruction and a subroutine

● Describe subroutine programs in subprogram areas, and use the SBL instruction and RET

instruction to indicate the start and end positions of the subroutine program.

● Subroutine call instructions can be described in either the main program area or a

subprogram area (another subroutine program).

Types of call instructions

● There are four types of subroutine call instructions as follows:

CALL (local subroutine)

FCALL (output OFF type local subroutine call)

ECALL (subroutine call (with PB number specification))

EFCALL (forced output OFF type subroutine call (with PB number specification))

● Local subroutine call instructions (CALL, FCALL) start subroutine programs within the same

● Subroutine call instructions (ECALL, EFCALL) start subroutine programs for a specified PB

Flow of the program process

● When the execution condition is ON, the subroutine call instruction is executed to start the

subroutine program beginning with the SBL instruction with the specified number. When the

execution condition is OFF, nothing occurs.

● When the subroutine program is processed up to the RET instruction, the program will return

to the address next to the subroutine call instruction, and continue with processing of the

WUME-FP7CPUPGR-12

Subroutine program

Main program area

Subprogram area