Zilog Z16C35 Instrukcja Użytkownika Pobierz pdf (Strona 82)

100

101

ISCC

User Manual

UM011002-0808

Figure 4–28. Changing Character Length

Most bit-oriented protocols allow an arbitrary number of bits between opening and clos-

ing flags. The ISCC allows for this by providing three bits of Residue Code in RR1 that

indicates which bits

in the last three bytes transferred fro the recieve data FIFO by the pro-

cessor are actually valid data bits (and not part of the frame check sequence or CRC).

Table 4-12 gives the meanings of the differe

nt codes for the four different character length

options. The valid data bits are right-justified, that is to say if the number of valid bits

given by the table is less than the character length, then the bits that are valid are the right-

most or least significant bits. It should also be noted that the Residue Code is only valid at

the time when the End of Frame bit in RR1 is set to 1.

654321

Receive Data Buffer

111098761213

19 18 17 16 15 142021

27 26 25 24 23 222829

32 31 30 29 28 273334

37 36 35 34 33 323839

Time

Change from Five to Eight

Change from Eight to Five

5 Bits

8 Bits

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