4.2.6.4
Controlling interrupt level
The CC-RH can manipulate the interrupts of the RH850 family as follows in a C source.
- | By controlling interrupt level |
- | By enabling or disabling acknowledgment of maskable interrupts (by masking interrupts) |
In other words, the interrupt control register can be manipulated.
(1) | Controlling the interrupt priority level |
For this purpose, the "__ set_il" function is used. Specify this function as follows to manipulate the interrupt priority level.
__set_il_rh(int interrupt-priority-level, void* address of interrupt control register);
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Integer values 1 to 16 can be specified as the interrupt priority level. With RH850, sixteen steps, from 0 to 15, can be specified as the interrupt priority level. To set the interrupt priority level to "5", therefore, specify the interrupt priority level as "6" by this function.
(2) | Enable or disable acknowledgement of maskable interrupts (interrupt mask) |
Specify the __ set_il function as follows to enable or disable acknowledgment of a maskable interrupt.
__set_il_rh(int enables/disables maskable interrupt, void* address of interrupt control register);
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Integer values -3 to 0 can be specified to enable or disable the maskable interrupt.
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0
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Enables acknowledgement of maskable interrupt (unmasks interrupt).
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-1
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Disables acknowledgment of maskable interrupt (masks interrupt).
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-2
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To use direct branching (standard specification) as the interrupt vector method
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-3
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To use table lookup (extended specification) as the interrupt vector method
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Caution | This facility can be used only when the -Xcpu={g3m|g3k|g3mh|g3kh} option is specified. In other cases, a value should be directly written to the interrupt control register without using this facility. |