T89C51CC02 Atmel, T89C51CC02 Datasheet - Page 75

• Manufacturer Part Number: T89C51CC02
• Description: 8-Bit MCU
• Manufacturer: Atmel

15.6. Fault Confinement
With respect to fault confinement, a unit may be in one of the three following statuses:
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 communication, 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.
Rev.A - May 17, 2001
error active,
error passive,
bus off.
TEC>127
REC>127
or
Passive
Error
TEC<127
REC<127
TEC>255
and
Active
Error
Init.
Figure 61. Line error mode
Preliminary
Bus
Off
128 occurrences
11 consecutive
recessive
of
bit
REC: Receive Error Counter
TEC: Transmit Error Counter
T89C51CC02
75