T89C51CC01 Atmel, T89C51CC01 Datasheet - Page 92
T89C51CC01
Manufacturer Part Number
T89C51CC01
Description
Enhanced 8-Bit Microcontroller
Manufacturer
Atmel
Datasheet
1.T89C51CC01.pdf
(170 pages)
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Fault Confinement
92
T89C51CC01
With respect to fault confinement, a unit may be in one of the three following status:
•
•
•
An error active unit takes part in bus communication and can send an active error frame
when the CAN macro detects an error.
An error passive unit cannot send an active error frame. It takes part in bus communica-
tion, but when an error is detected, a passive error frame is sent. Also, after a
transmission, an error passive unit will wait before initiating further transmission.
A bus off unit is not allowed to have any influence on the bus.
For fault confinement, two error counters (TEC and REC) are implemented.
See CAN Specification for details on Fault confinement.
Figure 49. Line Error Mode
error active
error passive
bus off
REC>127
TEC>127
or
Passive
Error
REC<127
TEC<127
TEC>255
and
Active
Error
Init.
Bus
Off
128 occurrences
11 consecutive
recessive
of
bit
REC: Receive Error Counter
TEC: Transmit Error Counter
4129K–CAN–01/05
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