r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 973

• Manufacturer Part Number: r4f2456
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

• EPIR04
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 16.2.
1. Endpoint number 0 and endpoint FIFO number 0 must have one-on-one relationship.
2. The maximum packet size for endpoint FIFO number 0 is limited to 16 bytes.
3. For endpoint FIFO number 0, only the maximum packet size can be specified and the data for
4. The maximum packet size for endpoint FIFO numbers 1 and 2 is limited to 64 bytes.
5. Only the bulk transfer method and out transfer direction can be specified for endpoint FIFO
6. Only the bulk transfer method and in transfer direction can be specified for endpoint FIFO
7. The maximum packet size for endpoint FIFO numbers 3 is limited to 16 bytes.
8. Only the interrupt transfer method and in transfer direction can be specified for endpoint FIFO
9. The maximum number of endpoint information settings is four.
10. Four endpoint information settings should be made.
11. Write 0 to the endpoints not in use.
Table 16.2 shows the limitations for the maximum packet size, the transfer method, and the
transfer direction.
Bit
7 to 0
the rest should be all 0.
numbers 1.
numbers 2.
numbers 3.
Bit Name
D7 to D0
Initial
Value
Undefined W
R/W
Description
Endpoint FIFO Number
[Possible setting range]
0 to 3
Rev. 1.00 Sep. 19, 2008 Page 943 of 1342
Section 16 USB Function Module (USB)
REJ09B0467-0100