Execution - 137 – Renesas 70 User Manual

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Chapter 7 Application Creation Guide

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7.1.1

System Calls from a Handler That Caused an Interrupt during Task Execution

Scheduling (task switching) is initiated by the ret_int service call

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(See Figure 7.1).

Scheduler

Interrupt

ret_int

iset_flg

TaskA

Interrupt handler

Save Registers

system call processing

OS

Restore Registers

SP <= User

Restore Registers

Task selection

TaskB

Figure 7.1 Processing Procedure for a System Call a Handler that caused an interrupt during Task

Execution

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The ret_int service call is issued automatically when OS-dependent handler is written in C language (when #pragma INTHANDLER

specified)

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