H8SSLASH2218 datasheet(526/750 Pages) RENESAS

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Section 14 Universal Serial Bus (USB)

Rev.6.00 Jun. 03, 2008 Page 478 of 698

REJ09B0074-0600

14.3.10

USB Endpoint Data Register 0o (UEDR0o)

UEDR0o is a data register for endpoint 0 (for Control_out transfer). UEDR0o stores data received

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

UESZ0o.

When 1 byte is read from UEDR0o, UESZ0o is decremented by1.

UEDR0o is a byte register to which 4-byte address area is assigned. Accordingly, UEDR0o 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 Control_out transfer

14.3.11

USB Endpoint Data Register 3 (UEDR3)

UEDR3 is a data register for endpoint 3 (for Interrupt_in transfer). UEDR3 stores data to be sent to

the host. The number of data items to be written continuously must be the maximum packet size or

less.

UEDR3 is a byte register to which 4-byte address area is assigned. Accordingly, UEDR3 allows

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

details, see section 2.9.4, Accessing Registers Containing Write-Only Bits.

Bit

Bit Name

Initial Value

R/W

Description

7 to 0 D7 to D0

All 0

These bits store data for Interrupt_in transfer

14.3.12

USB Endpoint Data Register 1 (UEDR1)

UEDR1 is a data register for endpoint 1 (for Bulk_in transfer). UEDR1 stores data to be sent to the

host. The number of data items to be written continuously must be the maximum packet size or

less.

UEDR1 is a byte register to which 4-byte address area is assigned. Accordingly, UEDR1 allows

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

details, see section 2.9.4, Accessing Registers Containing Write-Only Bits.

Bit

Bit Name

Initial Value

R/W

Description

7 to 0 D7 to D0

All 0

These bits store data for Bulk_in transfer

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