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RX4000V4 Datasheet

  • RX4000V4

  • RX4000(uITRON4.0) Basics User＇s Manual | User＇s Manual[02/...

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CHAPTER 8 INTERRUPT MANAGEMENT
8.5.5
Terminating interrupt service routines
An interrupt service routine is terminated by C language return or equivalent processing. A return value is not
required. Control therefore returns to either the next interrupt service routine to be activated or to the point at which
ivsta_isr was issued.
8.5.6
PID
If PID (Position Independent Data) is used for the code created when the interrupt service routine program is
compiled or assembled, the address that is to be the base of an interrupt service routine when it is created must be
assigned as a parameter (gp of the interrupt service routine creation packet T_CISR). The assigned address is set in
the gp register when the interrupt service routine is activated.
Note that this base address is unconditionally set in the gp register regardless of its attribute, etc., and therefore
must be set for programs that reference the gp register. If the gp register is not referenced, set NULL = 0.
8.5.7
Use of coprocessor in interrupt service routine
To use the coprocessor in an interrupt service routine, the save and restore processing for the registers related to
the coprocessor (FPR0 to FPR31, FRC31) must be described in the interrupt service routine鈥檚 activate and end
sections, respectively. Furthermore, to assign FCR31 (control/status register) uniquely to the interrupt service routine,
describe processing to set this register in the activate section of the interrupt service routine.
8.5.8
Issuance of service calls from interrupt service routines
Service calls in the form of ixxx_yyy starting with i and service calls in the form of sns_yyy can be issued from an
interrupt service routine. Service calls in the form of xxx_yyy without i can also be issued from an interrupt service
routine. For example, even if act_tsk, from which the i of iact_tsk is omitted, is issued, an error does not occur, and
the same processing as that of iact_tsk is performed. For details, refer to
13.8.
User鈥檚 Manual U14833EJ2V0UM
95

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