H8SX1663 datasheet(829/1158 Pages) RENESAS

829 / 1158 page

Section 16 USB Function Module (USB)

Rev.1.00 Jun. 07, 2006 Page 777 of 1102

REJ09B0294-0100

Bit

Bit Name

Initial

Value

R/W

Description



Reserved

These bits are always read as 0. The write value

should always be 0.

RWUPS

Remote Wakeup Status

This status bit indicates remote wakeup command

from USB host is enabled or disabled.

This bit is set to 0 when remote wakeup command

from UBM host is disabled by

Device_Remote_Wakeup due to Set Feature or Clear

Feature request. This bit is set to 1 when remote

wakeup command is enabled.

RSME

R/W

Resume Enable

This bit releases the suspend state (or executes

remote wakeup). When RSME is set to 1, resume

request starts. If RSME is once set to 1, clear this bit

to 0 again afterwards. In this case, the value 1 set to

RSME must be kept for at least one clock period of

12-MHz clock.

PWMD

R/W

Bus Power Mode

This bit specifies the USB power mode. When PWMD

is set to 0, the self-power mode is selected for this

module. When set to 1, the bus-power mode is

selected.

ASCE

R/W

Automatic Stall Clear Enable

Setting the ASCE bit to 1 automatically clears the stall

setting bit (the EPxSTL (x

= 1, 2, or 3) bit in EPSTLR0

or EPSTR1) of the end point that has returned the

stall handshake to the host. The automatic stall clear

enable is common to the all end points. Thus the

individual control of the end point is not possible.

When the ASCE bit is set to 0, the stall setting bit is

not automatically cleared. This bit must be released

by the users. To enable this bit, make sure that the

ASCE bit should be set to 1 before the EPxSTL (x

= 1,

2, or 3) bit in EPSTL is set to 1.

—

Reserved

This bit is always read as 0. The write value should

always be 0.

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