MC68HC05V12 Datasheet, PDF (149/246 Pages) Freescale Semiconductor, Inc – HCMOS Microcontreller Unit

Freescale Semiconductor, Inc.
Byte Data Link Controller – Digital (BDLC–D)
BDLC MUX Interface
Normalization Bit (NB)
The NB symbol has the same property as a logic 1 or a logic 0. It is
only used in IFR message responses.
Break Signal (BREAK)
The BREAK signal is defined as a passive-to-active transition
followed by an active period of at least 240 µs (see Figure 14-7(c)).
Start-of-Frame Symbol (SOF)
The SOF symbol is defined as passive-to-active transition followed by
an active period 200 µs in length (see Figure 14-7(d)). This allows the
data bytes which follow the SOF symbol to begin with a passive bit,
regardless of whether it is a logic 1 or a logic 0.
End-of-Data Symbol (EOD)
The EOD symbol is defined as an active-to-passive transition
followed by a passive period 200 µs in length (see Figure 14-7(e)).
End-of-Frame Symbol (EOF)
The EOF symbol is defined as an active-to-passive transition followed
by a passive period 280 µs in length (see Figure 14-7(f)). If no IFR
byte is transmitted after an EOD symbol is transmitted, after another
80 µs the EOD becomes an EOF, indicating completion of the
message.
Inter-Frame Separation Symbol (IFS)
The IFS symbol is defined as a passive period 300 µs in length. The
20-µs IFS symbol contains no transition, since when it is used it
always appends to a 280-µs EOF symbol (see Figure 14-7(g)).
Idle
An idle is defined as a passive period greater than 300 µs in length.
MC68HC05V12 — Rev. 2.0
Byte Data Link Controller – Digital (BDLC–D)
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Technical Data