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MC68HC08AS32A Datasheet(PDF) 74 Page - Motorola, Inc

No. de Pieza. MC68HC08AS32A
Descripción  Microcontrollers
Descarga  296 Pages
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Fabricante  MOTOROLA [Motorola, Inc]
Página de inicio  http://www.freescale.com
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MC68HC08AS32A Datasheet(HTML) 74 Page - Motorola, Inc

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Byte Data Link Controller-Digital (BDLC-D)
Data Sheet
MC68HC08AS32A — Rev. 1
74
Byte Data Link Controller-Digital (BDLC-D)
MOTOROLA
Figure 4-8. J1850 VPW Symbols with Nominal Symbol Times
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 4-8(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 4-8(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 4-8(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 used it always appends to an EOF
symbol (see Figure 4-8(g)).
Idle
An idle is defined as a passive period greater than 300
µs in length.
128
µs
ACTIVE
PASSIVE
64
µs
OR
(A) LOGIC 0
128
µs
ACTIVE
PASSIVE
64
µs
OR
(B) LOGIC 1
200
µs
ACTIVE
PASSIVE
(D) START OF FRAME
ACTIVE
PASSIVE
(F) END OF FRAME
≥ 240 µs
(C) BREAK
200
µs
(E) END OF DATA
280
µs
(G) INTER-FRAME
20
µs
300
µs
IDLE > 300
µs
(H) IDLE
SEPARATION
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com


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