HD6417320 RENESAS [Renesas Technology Corp], HD6417320 Datasheet - Page 885

• Manufacturer Part Number: HD6417320
• Description: Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

25.3.22 EP4 Data Register (EPDR4)
EPDR4 is a 128-byte receive FIFO buffer for endpoint 4. EPDR4 has a dual-buffer configuration,
and has a capacity of twice the maximum packet size. The number of receive byte is displayed in
the EP4 receive data size register. The receive data is fixed when an SOF packet is received.
Accordingly, all receive data must be read until the next SOF packet is received. When the next
SOF packet is received, the FIFO side is automatically switched over, and the previous data will
not be possible to be read. This FIFO buffer can be initialized by means of EP4CLR in the FCLR1
register.
25.3.23 EP5 Data Register (EPDR5)
EPDR5 is a 128-byte transmit FIFO buffer for endpoint 5. EPDR5 has a dual-buffer configuration,
and has a capacity of twice the maximum packet size. When transmit data is written to this FIFO
buffer and an SOF packet is received, one packet of transmit data is fixed, and the dual-FIFO
buffer is switched over. This FIFO buffer can be initialized by means of EP5CLR and EP5CCLR
in the FCLR1 register. (EP5CLR initializes both FIFOs and EP5CCLR initializes one FIFO which
is connected to the CPU.)
25.3.24 EP0o Receive Data Size Register (EPSZ0o)
EPSZ0o is a receive data size resister for endpoint 0o. EPSZ0o indicates the number of bytes
received from the host.
Bit
7 to 0 D7 to D0
Bit
7 to 0 D7 to D0
Bit
7 to 0 
Bit Name
Bit Name
Bit Name
Initial Value R/W
All 0
Undefined
Undefined
Initial Value R/W Description
Initial Value R/W Description
R
R
W
Description
Number of receive data for endpoint 0
Data register for endpoint 4 transfer
Data register for endpoint 5 transfer
Section 25
Rev. 3.00 Jan. 18, 2008 Page 823 of 1458
USB Function Controller (USBF)
REJ09B0033-0300