AT90SCR100 datasheet(164/433 Pages) ATMEL

164 / 433 page

164

TPR0327AY–SMS–30Jan09

AT90SCR100

Figure 14-5.

Receiving Data Packets

14.8

USB Device Registers Description

14.8.1

USBCR - USB Control Register

• Bit 7 - URMWU : USB Remote Wake up bit

When in suspend mode, setting this bit to one generates a wake-up command to the host,

according to USB2.0 specifications.

This bit must be cleared by software when USBGS.RSMON is cleared. See “Remote Wake-up”

on page 162.

• Bit 6 - Res : Reserved Bit

This bit is reserved bits in the AT90SCR100 and is always read as zero.

• Bit 5 - UPUC : USB Pull-Up Connection Bit

This bit is set (one) and cleared (zero) by software.

It directly acts on the connection of the USB pull-up attachment resistors between USB bus sig-

nal D+ and VREG.

If set (one) the pull-up is connected. If cleared (zero) the pull-up is not connected.

• Bit 4..2 - Res : Reserved Bits

These bits are reserved bits in the AT90SCR100 and are always read as zero.

USBCSEX.RCVD = 1 ?

(POLLING or INTERRUPT)

READ register

USBDBCEX -> NbBytes

READ DPRAM to get

NbBytes Bytes of data

CLEAR UCSEX.RCVD

END

Bit

7654

$0000E0

URMWU

UPUC

USBE

USBCR

Read/write

R/W

Initial value

0000

0x00

AT90SCR100 Datasheet(PDF) 164 Page - ATMEL Corporation

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