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Chapter 13
FCAN Interface Function
Preliminary User’s Manual U14913EE1V0UM00
Figure 13-34: CAN 1 to 3 Control Registers (C1CTRL to C3CTRL) (2/4)
Read (2/3)
11
BOFF
Indicates a bus-off status of the CAN module.
0: CAN module is not in bus-off state (transmission error counter < 256)
1: CAN module is in bus-off state (transmission error counter = 256)
10
TSTAT
Indicates the transmission status.
0: No transmission activity on the CAN bus.
1: Transmission activity on the CAN bus.
9
RSTAT
Indicates the reception status.
0: No reception activity on the CAN bus.
1: Reception activity on the CAN bus.
8
ISTAT
Indicates the initialisation mode.
0: CAN module is in normal operation mode.
1: CAN module is stopped and set into initialisation mode.
Remarks:
1. The ISTAT bit is set when the setting of the INIT bit is acknowledged by
the CAN protocol layer. It is cleared automatically when the INIT bit is
cleared.
2. In initialisation mode the level of the corresponding CAN transmit out-
put is recessive (logical high).
3. Data manipulation of the CxSYNC and CxBRP registers is only possi-
ble during INIT state.
4. In INIT state the transmission and reception error counters are
cleared and any error status is reset.
6
DLEVR
Specifies the dominant level of the CAN receive input pin.
0: Low level at the receive input is interpreted as a dominant bit (0).
1: High level at the receive input is interpreted as a dominant bit (0).
Remark:
From software point of view a dominant bit is always a “0” value.
5
DLEVT
Specifies the dominant level of the CAN transmit output pin.
0: A dominant bit (0) results in a low level output.
1: A dominant bit (0) results in a high level output.
Remark:
From software point of view a dominant bit is always a “0” value.
4
OVM
Specifies the CAN message buffer overwrite mode.
0: A new CAN message overwrites a message buffer with DN flag set (1).
1: A new CAN message is discarded, if it would be stored in a message buffer with
DN bit set (1).
Remark:
The OVM bit determines how to handle a receive message in case this
message would overwrite the corresponding receive message buffer.
3
TMR
Specifies the time stamp mode for reception.
0: CGTSC counter is captured into the corresponding M_TIMEm register at SOF
signal of the receive message.
1: CGTSC counter is captured into the corresponding M_TIMEm register, when
the valid receive message is copied into the message buffer.
Remark:
For details refer to chapter 13.2.5 Time
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