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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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H8S/2218 Scheda tecnica(PDF) 528 Page - Renesas Technology Corp |
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H8S/2218 Scheda tecnica(HTML) 528 Page - Renesas Technology Corp |
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528 / 750 page  Section 14 Universal Serial Bus (USB) Rev.6.00 Jun. 03, 2008 Page 480 of 698 REJ09B0074-0600 14.3.16 USB Interrupt Flag Register 0 (UIFR0) UIFR0 is an interrupt flag register indicating the setup command reception, EP0 and EP3 transmission/reception, and bus reset state. If the corresponding bit is set to 1, the corresponding EXIRQ0 or EXIRQ1 interrupt is requested to the CPU. A bit in this register can be cleared by writing 0 to it. Writing 1 to a bit is invalid and causes no operation. Consequently, to clear a flag, write 0 to the corresponding bit and 1 to all the other bits. (For example, write H'DF to clear bit 5.) The bit-clear instruction is a read/modify/write instruction, so if a new flag is set between the read and write operations, there is a danger that it may be cleared erroneously. Therefore, do not use the bit-clear instruction to clear bits in this interrupt flag resister. |
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