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MC68336/376
REGISTER SUMMARY
MOTOROLA
USER’S MANUAL
Rev. 15 Oct 2000
D-92
STUFFERR — Bit Stuff Error
The STUFFERR bit indicates whether or not the bit stuffing which occurred in the last
transmitted or received message was correct.
0 = No bit stuffing error was detected since the last read of this register.
1 = A bit stuffing error was detected since the last read of this register.
TXWARN — Transmit Error Status Flag
The TXWARN status flag reflects the status of the TouCAN transmit error counter.
0 = Transmit error counter
< 96.
1 = Transmit error counter
≥ 96.
RXWARN — Receiver Error Status Flag
The RXWARN status flag reflects the status of the TouCAN receive error counter.
0 = Receive error counter
< 96.
1 = Receive error counter
≥ 96.
IDLE — Idle Status
The IDLE bit indicates when there is activity on the CAN bus.
0 = The CAN bus is not idle.
1 = The CAN bus is idle.
TX/RX — Transmit/Receive Status
The TX/RX bit indicates when the TouCAN module is transmitting or receiving a mes-
sage. TX/RX has no meaning when IDLE = 1.
0 = The TouCAN is receiving a message if IDLE = 0.
1 = The TouCAN is transmitting a message if IDLE = 0.
FCS[1:0] — Fault Confinement State
The FCS[1:0] field describes the state of the TouCAN. Refer to Table D-63.
If the SOFTRST bit in CANMCR is asserted while the TouCAN is in the bus off state,
the error and status register is reset, including FCS[1:0]. However, as soon as the
TouCAN exits reset, FCS[1:0] bits will again reflect the bus off state. Refer to
13.4.4Error Counters for more information on entry into and exit from the various fault
confinement states.
BOFFINT — Bus Off Interrupt
The BOFFINT bit is used to request an interrupt when the TouCAN enters the bus off
state.
0 = No bus off interrupt requested.
1 = When the TouCAN state changes to bus off, this bit is set, and if the BOFFMSK
bit in CANCTRL0 is set, an interrupt request is generated. This interrupt is not
requested after reset.
Table D-63 Fault Confinement State Encoding
FCS[1:0]
Bus State
00
Error active
01
Error passive
1X
Bus off