H8SSLASH2218 datasheet(531/750 Pages) RENESAS

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Section 14 Universal Serial Bus (USB)

Rev.6.00 Jun. 03, 2008 Page 483 of 698

REJ09B0074-0600

14.3.18

USB Interrupt Flag Register 3 (UIFR3)

UIFR3 is an interrupt flag register indicating the USB status. If the corresponding bit is set to 1,

the corresponding

EXIRQ0, EXIRQ1, or IRQ6 interrupt is requested to the CPU. VBUSi, SPRSi,

SETC, SOF, and CK48READY flags can be cleared by writing 0 to them. Writing 1 to them 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. VBUSs and SPRSs are status bits and cannot be cleared.

Bit

Bit Name

Initial Value

R/W

Description

CK48READY 0

R/(W)* USB Operating Clock (48 MHz) Stabilization Detection

Set to 1 when the USB operating clock (48 MHz)

stabilization time has been automatically counted after

USB module stop mode cancellation. The

corresponding interrupt output is

EXIRQ0 or EXIRQ1.

CK48READY can also operate in the USB interface

software reset state (the UIFRST bit in UCTLR is set

to 1).

Refer to the UCKS3 to UCKS0 bits in section 14.3.1,

USB Control Register (UCTLR).

SOF

R/(W)* Start of Frame Packet Detection

Set to 1 if the Start of Frame (SOF) packet is

detected. The corresponding interrupt output is

EXIRQ0 or EXIRQ1.

SETC

R/(W)* Set_Configuration Command Detection

Set to 1 if the Set_Configuration command is

detected. The corresponding interrupt output is

EXIRQ0 or EXIRQ1.

—

Reserved

This bit is always read as 0 and cannot be modified.

SPRSs

Suspend/Resume Status

SPRSs indicates the suspend/resume status.

However, an interrupt cannot be requested by SPRSs.

0: Indicates that the bus is in the normal state.

1: Indicates that the bus is in the suspend state.

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