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M32C/8A Datasheet(PDF) 357 Page - Renesas Technology Corp |
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M32C/8A Datasheet(HTML) 357 Page - Renesas Technology Corp |
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357 / 372 page  M32C/8A Group 24. Usage Notes Rev.1.00 Jul 15, 2007 Page 340 of 352 REJ09B0385-0100 24.5.4 Changing Interrupt Control Register To change the Interrupt Control Register while an interrupt request is disabled, use the following instructions. Changing IR bit: The IR bit may not be changed to 0 (interrupt not requested) by writing, depending on which instruction is used. If this causes a problem, use MOV instruction to change the register. (Technical update: TN-M16C-85-0204) Changing any bits other than IR bit: If an interrupt request is generated while writing to the corresponding Interrupt Control Register with instructions such as MOV, the IR bit may not become 1 (interrupt requested) and the interrupt is not acknowledged. If this causes a problem, use the following instructions to write to the register: AND, OR, BCLR, BSET 24.5.5 Changing RLVL Register The DMAII bit in the RLVL register is undefined after reset. To use interrupt priority level 7 for an interrupt, set it to 0 before setting the Interrupt Control Register. |
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