Renesas M3T-MR100 Manuel d'utilisateur télécharger pdf (Page 278)

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10. Stack Size Calculation Method

10.1 Stack Size Calculation Method

The MR100 provides two kinds of stacks: the system stack and the user stack. The stack size calculation method differ be-

tween the stacks.

z User stack

This stack is provided for each task. Therefore, writing an application by using the MR100 requires to allocate

the stack area for each stack.

z System stack

This stack is used inside the MR100 or during the execution of the handler.

When a task issues a service call, the MR100 switches the user stack to the system stack. (See Figure

10.1:System

Stack and User Stack)

The system stack uses interrupt stack(ISP).

Stack switching

Service call

rocessing

Task Selection

Stack switching

ister return

XXX_XXX()

MR100 Service Call Processing Position

User Stack

System Stack

(interruput stack)

Task

Figure 10.1:System Stack and User Stack

The sections of the system stack and user stack each are located in the manner shown below. However, the diagram shown

below applies to the case where the stack areas for all tasks are located in the stack section during configuration.

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Renesas M3T-MR100 Manuel d'utilisateur Page 278