Fujitsu F2MC-16LX Hardware Manual page 291

[bit 8, bit 7] Reserved bit
It is reserved bit. Please write "0".
The bit always reads "0" when read.
[bit 6 to bit 0] PKS0:Packet size end point 0 set bit
It specifies the maximum number of transfer bytes per packet. The maximum number of transfer bytes
per packet that EndPoint0 can specify is 64 bytes, which is a setting common to IN and OUT.
<Example> "08
Note:
Setting a value not less than the maximum number of transfer bytes (40
"→8 Byte, "40 "→64 Byte (maximum specified value)
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CHAPTER 13 USB FUNCTION
) and "00 " is forbidden.
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