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Chapter 14
FCAN Interface Function
Preliminary User’s Manual U15839EE1V0UM00
Figure 14-30:
Message Control Registers 00 to 31 (M_CTRL00 to M_CTRL31) (2/2)
Remarks: 1. m = 00 to 31
2. x = 1 to 4 for the derivatives µPD703129(A) and µPD703129(A1).
3. x = 1 to 2 for the derivative µPD703128(A).
Bit Position
Bit Name
Function
4
IE
Enables message buffer m related interrupts.
0: Interrupts related to message buffer m disabled.
1: Interrupts related to message buffer m enabled.
Remark:
If the message related interrupt is enabled, an interrupt is generated for
any of the following conditions:
An interrupt is not generated, even if enabled, for any of the following con-
ditions:
3
MOVR
Indicates a message buffer overwrite.
0: No overwriting occurred.
1: Message buffer contents have been overwritten at least once since the DN flag
of the M_STATm register has been cleared (0).
Remark:
If the OVM bit of the CxCTRL register is cleared (0) a message buffer
linked to this CAN module might be overwritten by new messages
although the DN flag is already set. Checking the MOVR bit additionally,
indicates whether the message buffer has been overwritten.
2
R1
Reserved bit (value of CAN bus bit r0 for receive message buffer)
1
R0
Reserved bit (value of CAN bus bit r1 for receive message buffer)
0
RTR
Specifies remote or data frame type of the message buffer.
0: Message received or to be sent is a data frame
1: Message received or to be sent is a remote frame.
Remark:
When the RTR bit is set (1) for a transmit message, a remote frame is
transmitted for the given identifier instead of a data frame. The RTR bit can
be read for a receive message to determine whether a data frame or a
remote frame was received.
Condition
Related Interrupt
Data frame or remote frame is transmitted from
transmit message buffer.
CANxTRX
Data frame or remote frame is received on
receive message buffer.
CANxREC
Remote frame is received on transmit message
without auto answering set (RMDE0 = 0).
Condition
Remote frame is received on a transmit message with auto answering
mode (RMDE0 = 1).
Remote frame is transmitted from receive message buffer.
Содержание mPD703128
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