H8SXSLASH1663M datasheet(1026/1504 Pages) RENESAS

1026 / 1504 page

Section 20 USB Function Module (USB)

Rev. 2.00 Sep. 24, 2008 Page 994 of 1468

REJ09B0412-0200

• EPIR04

Bit

Bit Name

Initial

Value

R/W

Description

7 to 0

D7 to D0

Undefined

Endpoint FIFO Number

[Possible setting range]

0 to 3

The endpoint number is the endpoint number the USB host uses. The endpoint FIFO number

corresponds to the endpoint number described in this manual. Thus data transfer between the USB

host and the endpoint FIFO can be enabled by putting the endpoint number and the endpoint FIFO

number in one-to-one correspondence. Note that the setting value is subject to a limitation

described below.

Since each endpoint FIFO number is optimized by the exclusive software that corresponds to the

transfer system, direction, and the maximum packet size, make sure to set the endpoint FIFO

number to the data described in table 20.2.

1. The endpoint FIFO number 1 cannot designate other than the maximum packet size of 64

bytes, bulk transfer method, and out transfer direction.

endpoint number 0 and the endpoint FIFO number must have one-on one relationship.

3. The maximum packet size for the endpoint FIFO number 0 is 8 bytes only.

4. The endpoint FIFO number 0 can specify only the maximum packet size and the data for the

rest should be all 0.

5. The maximum packet size for the endpoint FIFO numbers 1 and 2 is limited to 64 bytes.

6. The maximum packet size for the endpoint FIFO numbers 3 is limited to 8 bytes.

7. The maximum number of endpoint information setting is ten.

8. Up to ten endpoint information setting should be made.

9. Write 0 to the endpoints not in use.

Table 20.2 shows the example of limitations for the maximum packet size, the transfer method,

and the transfer direction.

Table 20.2

Example of Limitations for Setting Values

Endpoint FIFO Number

Maximum Packet Size

Transfer Method

Transfer Direction

8 bytes

Control



64 bytes

Bulk

Out

64 bytes

Bulk

8 bytes

Interrupt

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