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Section 22 USB Function Module (USB)
22.3.25 Endpoint Information Register (EPIR)
This register sets the information for each endpoint. Each endpoint needs five bytes to store the
information. Writing data should be done in sequence starting at logical endpoint 0. Do not write
data of more than 50 bytes (five bytes multiplied by ten endpoints) to this register. The
information should be written to this register only once at a power-on reset and no data should be
written after that. Description of writing data for one endpoint is shown below.
Although this register consists of one register to which data is written sequentially for one address,
the write data for the endpoint 0 is described as EPIR00 to EPIR05 (EPIR endpoint number in
write order) to make the explanation understood easier. Write should start at EPIR00.
• EPIR00
Bit
Bit Name
7 to 4
D7 to D4
3, 2
D3, D2
1, 0
D1, D0
Rev. 1.00 Mar. 12, 2008 Page 856 of 1178
REJ09B0403-0100
Initial
Value
R/W
Description
Undefined W
Endpoint Number
[Enable setting range]
0 to 3
Undefined W
Endpoint Configuration Number
[Enable setting range]
0 or 1
Undefined W
Endpoint Interface Number
[Enable setting range]
0 to 3
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