H8SSLASH2218 datasheet(527/750 Pages) RENESAS

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Section 14 Universal Serial Bus (USB)

Rev.6.00 Jun. 03, 2008 Page 479 of 698

REJ09B0074-0600

14.3.13

USB Endpoint Data Register 2 (UEDR2)

UEDR2 is a data register for endpoint 2 (for Bulk_out transfer). UEDR2 stores data received from

the host. The number of data items to be read must be the number of bytes specified by UESZ2.

When 1 byte is read from UEDR2, UESZ2 is decremented by1.

UEDR2 is a byte register to which 4-byte address area is assigned. Accordingly, UEDR2 allows

the user to read 2-byte or 4-byte data continuously by word transfer or longword transfer.

Bit

Bit Name

Initial Value

R/W

Description

7 to 0 D7 to D0

—

These bits store data for Bulk_out transfer

14.3.14

USB Endpoint Receive Data Size Register 0o (UESZ0o)

UESZ0o is a receive data size register for endpoint 0 (for Control_out transfer). UESZ0o indicates

the number of bytes of data to be received from the host.

Note that UESZ0o is decremented by 1 every time when 1 byte is read from UEDR0o.

Bit

Bit Name

Initial Value

R/W

Description

—

Reserved

6 to 0 D6 to D0

—

These bits indicate the size of data to be received in

Control_out transfer

14.3.15

USB Endpoint Receive Data Size Register 2 (UESZ2)

UESZ2 is a receive data size register for endpoint 2 (for Bulk_out transfer). UESZ2 indicates the

number of bytes of data to be received from the host.

Note that UESZ2 is decremented by 1 every time when 1 byte is read from UEDR2.

The FIFO for endpoint 2 (for Bulk_out transfer) has a dual-FIFO configuration. The data size

indicated by this register refers to the currently selected FIFO.

Bit

Bit Name

Initial Value

R/W

Description

—

Reserved

6 to 0 D6 to D0

—

These bits indicate the size of data to be received in

Bulk_out transfer

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