H8SSLASH2218 datasheet(548/750 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

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548 / 750 page

Section 14 Universal Serial Bus (USB)

Rev.6.00 Jun. 03, 2008 Page 500 of 698

REJ09B0074-0600

(3) USB Cable Disconnection (When USB module stop or power-down mode is not used)

If the USB cable enters the disconnection state from the connection state in an application (self

powered) where USB module stop or power-down mode is not used, perform the operation as

shown in figure 14.5. In bus-powered mode, the power is automatically turned off when the

USB cable is disconnected and the following processing is not required.

Disconnect the USB cable

VBUS interrupt occurs

USB function

Firmware

Reset the UDC core

Clear VBUSi in UIFR3 to 0

Check if VBUSs in UIFR3

is cleared to 0

Cancel D + pull-up by

port 36 (P36)

Wait for USB cable connection

Reset the UDC core

Write UDCRST in UCTLR to 1

EXIRQx

Note:

VBUS interrupts in the USB module cannot be detected in power-down mode

or in the USB module stop state.

Figure 14.5 USB Cable Disconnection

(When USB Module Stop or Power-Down Mode Is not Used)

H8S/2218 数据表(PDF) 548 Page - Renesas Technology Corp