7641 datasheet(73/385 Pages) RENESAS

73 / 385 page

Rev.2.00

Aug 28, 2006

page 56 of 113

7641 Group

REJ09B0336-0200

HARDWARE

FUNCTIONAL DESCRIPTION

[USB Endpoint x (x = 1 to 4) OUT Control Register] OUT_CSR

This register contains the information and status of the respective

OUT endpoints 1 to 4. In the endpoint 0, all bits are reserved and

cannot be used (they will all be read out as “0”). The USB FCU

sets the OUT_PKT_RDY flag to “1” after a data packet has been

received into the OUT FIFO. After reading the data packet in the

OUT FIFO, clear this flag to “0”. However, if there is still data in the

OUT FIFO, the flag cannot be cleared even by writing “0” by soft-

ware.

USB endpoint x OUT control register (address 005A16)

OUT_CSR

OUT_PKT_RDY flag (OUTXCSR0)

0: Except the following condition (Note 3)

1: End of a data packet reception (Note 2)

OVER RUN flag (OUTXCSR1) (In isochronous data transfer)

0: No FIFO overrun (Note 2)

1: FIFO overrun occurred (Note 1)

SEND_STALL bit (OUTXCSR2) (Note 2)

0: Except the following condition

1: Transmitting STALL handshake signal

ISO/TOGGLE_INIT bit (OUTXCSR3) (Note 2)

0: Except the following condition

1: Initializing to endpoint used for isochronous transfer;

Enabling reception of DATA0 and DATA1 as PID (Initializing the

toggle)

FORCE_STALL flag (OUTXCSR4)

0: Except the following condition (Note 2)

1: Protocol error detected (Note 1)

DATA_ERR flag (OUTXCSR5)

0: Except the following condition (Note 2)

1: CRC or bit stuffing error detected in transferring isochronous data

(Note 1)

FLUSH bit (OUTXCSR6)

0: Except the following condition (Note 1)

1: Flush FIFO. (Note 2)

AUTO_CLR bit (OUTXCSR7) (Note 2)

0: AUTO_CLR disabled

1: AUTO_CLR enabled

Notes 1: This bit is automatically set to “1” or cleared to “0”.

2: The user must program to “1” or “0”.

3: When AUTO_CLR bit is “0”, the user must clear to “0”. When AUTO_CLR bit is “1”, this

bit is automatically cleared to “0”.

Fig. 48 Structure of USB endpoint x (x = 1 to 4) OUT control register

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