Z80 Datasheet, PDF (318/330 Pages) Zilog, Inc. – Z80 CPU PERIPHERALS

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Table 33. Residue Codes
I-Field Bits in
Residue Code Residue Code Residue Code I-Field Bits in Second
2
1
0
Previous Byte Previous Byte
0
1
1
0
8
1
1
1
1
8
0
0
0
2
8
I-Field bits are always right justified.
If a receive character length is different from eight bits is used for the I-
field, a table similar to the previous one may be constructed for each
different character length. For no residue, that is, when the last character
boundary coincides with the boundary of the I-field and CRC field, the
Residue codes are:
Table 34. Receive Character Length
Bits per Character Residue Code 2 Residue Code 1 Residue Code 0
8 Bits per Character 0
1
1
7 Bits per Character 0
0
0
6 Bits per Character 0
1
0
5 Bits per Character 0
0
1
UM008101-0601
Serial Input/Output