AN2283 Freescale Semiconductor / Motorola, AN2283 Datasheet - Page 28

• Manufacturer Part Number: AN2283
• Description: Scalable Controller Area Network (MSCAN)
• Manufacturer: Freescale Semiconductor / Motorola

AN2283/D
28
WARNING/ERROR
ERROR ACTIVE)
(NODE STATE:
NO
NOTE:
TEC = 0 AND REC = 0 AFTER 128 OCCURRENCES OF 11 CONSECUTIVE RESSIVE [1] BITS ARE MONITORED
96 <= TEC < 128
96 <= REC <128
REC < 96
TEC < 96
AND
Motorola Scalable Controller Area Network (MSCAN) Interrupts
OR
The node’s receiver has three states depending on the value of the REC:
The node’s transmitter has four states depending on the value of the TEC:
The Bus Off State is entered only when TEC > 255.
Keeping track of error counts allows the user to decide whether further
diagnostics or actions are required. The warnings and errors are directed to the
CRFLG register (see
that an error/warning has occurred.
WUPIF
1. No Warning/Error State
2. Receiver Warning State
3. Receiver Error Passive State
1. No Warning State
2. Transmitter Warning State
3. Transmitter Error Passive State
4. Bus Off State
Freescale Semiconductor, Inc.
Bit 7
For More Information On This Product,
TRANSMITTER
(NODE STATE:
RECEIVER/
WARNING
ACTIVE)
ERROR
RWRNIF
Figure 21. MSCAN Receiver Flag Register (CRFLG)
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Figure 20. Node States
6
128 <= TEC <= 255
128 <= REC <= 255
Figure
TWRNIF
96 <= TEC < 128
96 <= REC <128
5
OR
AND
21) where the flags will be set accordingly to notify
RERRIF
ERROR PASSIVE
4
TRANSMITTER
(NODE STATE:
RECEIVER/
PASSIVE)
ERROR
TERRIF
3
TEC > 255
BOFFIF
2
OVRIF
(NODE STATE:
BUS OFF)
1
BUS OFF
MOTOROLA
Bit 0
RXF