Renesas 70 - Manual (Page 148)

Chapter 7 Application Creation Guide
- 138 -
7.1.2 System Calls from a Handler That Caused an Interrupt during System Call
Processing
Scheduling (task switching) is initiated after the system returns to the interrupted service call processing (See
Figure 7.2).
wup_tsk
ret_int
iset_flg
Interrupt
TaskA
Interrupt handler
Save Registers
system call processing
OS
Restore Registers
SP <= User
Restore Registers
Task selection
TaskB
Save Registers
SP <= System
Figure 7.2 Processing Procedure for a System Call from a Handler that caused an interrupt during
System Call Processing