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SA-1100 Developer’s Manual 11-67
Peripheral Control Module
11.8.6 UDC IN Max Packet Register
The UDC IN max packet register holds the value of the number of bytes the UDC core is to
transmit minus one. This is done in order to accommodate maximum packets of 256 bytes, without
going to a max packet field of more than 8 bits. In order to transmit packets of 256 bytes, a value of
0xff (255) should be written into the IN max packet register. At reset the IN max packet register
contains 0x08, and will therefore transmit packets of length 9 bits.
Address: 0h 8000 000C UDCIMP Read/Write
Bit76543210
Max Packet Size - 1
Reset00001000
Bit Name Description
7..0 IN MaxP
IN max packet size.
8-bit field containing the value of the number of bytes to transmit minus one.