7641 datasheet(70/385 Pages) RENESAS

70 / 385 page

Rev.2.00

Aug 28, 2006

page 53 of 113

7641 Group

REJ09B0336-0200

HARDWARE

FUNCTIONAL DESCRIPTION

[USB Frame Number Registers Low and High ]

USBSOFL, USBFOFH

These 11-bit registers contain the frame number of the SOF token

received from the host computer. These are read-only registers.

[USB Endpoint Index Register] USBINDEX

This register specifies the accessible endpoint. It serves as an in-

dex to endpoint-specific USB Endpoint x IN Control Register, USB

Endpoint x OUT Control Register, USB Endpoint x IN Max. Packet

Size Register, USB Endpoint x OUT Max. Packet Size Register,

USB Endpoint x OUT Write Count Register, and USB FIFO Mode

Selection Register (x = 0 to 4).

USB frame number register Low (address 005616)

USBSOFL

Low-order 8 bits of SOF token

High-order 3 bits of SOF token

Reserved bit (“0” at read)

USB frame number register High (address 005716)

USBSOFH

USB endpoint index register (address 005816)

USBINDEX

Endpoint index bit (EPINDEX)

b2b1b0

0 0 0: Endpoint 0

0 0 1: Endpoint 1

0 1 0: Endpoint 2

0 1 1: Endpoint 3

1 0 0: Endpoint 4

1 0 1: Not used

1 1 0: Not used

1 1 1: Not used

Reserved bit (“0” at read/write)

AUTO_FLUSH bit (AUTO_FL)

0: Auto FIFO flush disabled

1: Auto FIFO flush enabled

ISO_UPDATE bit (ISO_UPD)

0: ISO_UPDATE disabled

1: ISO_UPDATE enabled

000

Fig. 44 Structure of USB frame number registers

Fig. 45 Structure of USB frame number registers

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