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The interrupt management function provides a function to process requested external interrupts in real time. 

The interrupt management service calls provided by the MR308 kernel include the following: 

• 

Returns from interrupt handler (ret_int) 

The ret_int service call activates the scheduler to switch over tasks as necessary when returning from 
the interrupt handler. 
When using the C language,

, this function is automatically called at completion of the handler func-

tion. In this case, therefore, there is no need to invoke this service call. 
 

Figure 3.43 shows an interrupt processing flow. Processing a series of operations from task selection to register 
restoration is called a "scheduler.". 

 

Interrupt

TaskA

Save Registers

Handler Processing

iwup_tsk

ret_int

Task Selection

Restore Registers

TaskB

#pragma INTHANDLER Declare
(C language)

 

 

                                                      

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  In the case that the interruput handler is specified by "#pragma INTHANDLER".