FlexRay Communication Controller (FlexRAY)
PXN20 Microcontroller Reference Manual, Rev. 1
26-74 Freescale Semiconductor
Table 26-79. MBCCSRn Field Descriptions
Field Description
Message Buffer Configuration
MCM Message Buffer Commit Mode — This bit configures the commit mode of a double buffered message buffer.
0 Streaming commit mode.
1 Immediate commit mode.
MBT Message Buffer Type — This bit configures the buffering type of a transmit message buffer.
0 Single buffered message buffer.
1 Double buffered message buffer.
MTD Message Buffer Transfer Direction — This bit configures the transfer direction of a message buffer.
0 Receive message buffer.
1 Transmit message buffer.
Message Buffer Control
CMT Commit for Transmission — This bit indicates if the transmit message buffer data are ready for transmission.
0 Message buffer data not ready for transmission.
1 Message buffer data ready for transmission.
EDT Enable/Disable Trigger — If the application writes 1 to this bit, a message buffer enable or disable is triggered,
depending on the current value EDS status bit is 0.
0 No effect.
1 Message buffer enable or disable is triggered.
LCKT Lock/Unlock Trigger — If the application writes 1 to this bit, a message buffer lock or unlock is triggered,
depending on the current value of the LCKS status bit.
0 No effect.
1 Message buffer lock or unlock is triggered.
MBIE Message Buffer Interrupt Enable — This control bit defines whether the message buffer will generate an
interrupt request when its MBIF flag is set.
0 Interrupt request generation disabled.
1 Interrupt request generation enabled.
Message Buffer Status
DUP Data Updated — This status bit indicates whether the frame header in the message buffer header field and the
data in the message buffer data field were updated after a frame reception.
0 Frame Header and Message buffer data field not updated.
1 Frame Header and Message buffer data field updated.
DVAL Data Valid — For receive message buffers this status bit indicates whether the message buffer data field
contains valid frame data. For transmit message buffers the status bit indicates if a message is transferred again
due to the state transmission mode of the message buffer.
0 receive message buffer contains no valid frame data / message is transmitted for the first time.
1 receive message buffer contains valid frame data / message will be transferred again.
EDS Enable/Disable Status — This status bit indicates whether the message buffer is enabled or disabled.
0 Message buffer is disabled.
1 Message buffer is enabled.
LCKS Lock Status — This status bit indicates the current lock status of the message buffer.
0 Message buffer is not locked by the application.
1 Message buffer is locked by the application.
MBIF Message Buffer Interrupt Flag — This flag is set when the slot status field of the message buffer was updated
after frame transmission or reception, or when a transmit message buffer was just enabled by the application.
0 No such event.
1 Slot status field updated or transmit message buffer just enabled.
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