mc68hc908as60 Freescale Semiconductor, Inc, mc68hc908as60 Datasheet - Page 355
mc68hc908as60
Manufacturer Part Number
mc68hc908as60
Description
Mc68hc908as60 Microcontroller
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC908AS60.pdf
(454 pages)
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MC68HC908AS60 — Rev. 1.0
CRC Error
Symbol Error
Framing Error
Bus Fault
A cyclical redundancy check (CRC) error is detected when the data
bytes and CRC byte of a received message are processed and the
CRC calculation result is not equal. The CRC code will detect any
single and 2-bit errors, as well as all 8-bit burst errors and almost all
other types of errors. The CRC error flag (in BSVR) is set when a CRC
error is detected (see
A symbol error is detected when an abnormal (invalid) symbol is
detected in a message being received from the J1850 bus. The invalid
symbol is set when a symbol error is detected (see
State Vector
A framing error is detected if an EOD or EOF symbol is detected on a
non-byte boundary from the J1850 bus. A framing error also is
detected if the BDLC is transmitting the EOD and instead receives an
active symbol. The symbol invalid, or the out-of-range flag, is set
when a framing error is detected (see
Register).
If a bus fault occurs, the response of the BDLC will depend upon the
type of bus fault.
If the bus is shorted to battery, the BDLC will wait for the bus to fall to
a passive state before it will attempt to transmit a message. As long
as the short remains, the BDLC will never attempt to transmit a
message onto the J1850 bus.
If the bus is shorted to ground, the BDLC will see an idle bus, begin
to transmit the message, and then detect a transmission error (in
BSVR), since the short to ground would not allow the bus to be driven
to the active (dominant) SOF state. The BDLC will abort that
transmission and wait for the next CPU command to transmit.
Freescale Semiconductor, Inc.
For More Information On This Product,
Byte Data Link Controller-Digital (BDLC-D)
Go to: www.freescale.com
Register).
21.7.4 BDLC State Vector
Byte Data Link Controller-Digital (BDLC-D)
21.7.4 BDLC State Vector
BDLC Protocol Handler
Register).
21.7.4 BDLC
Technical Data
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