H8SSLASH2218 datasheet(528/750 Pages) RENESAS

部件名	H8S/2218

功能描述	16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series

PDF	750 Pages

Scroll/Zoom	100%

制造商	RENESAS [Renesas Technology Corp]

网页	http://www.renesas.com

标志

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.

H8S/2218 数据表(PDF) 528 Page - Renesas Technology Corp