NEC V850E/IA1 mPD703116 User Manual page 553

Bit Position Bit Name
5 ATS
4 IE
3 MOVR
0 RTR
Remark DN: Bit 2 of M_STATn register (see 11.10 (8) CAN message status registers 00 to 31
(M_STAT00 to M_STAT31))
CHAPTER 11 FCAN CONTROLLER
Specifies whether or not to add a time stamp when transmitting.
0: Time stamp not added when transmitting
1: Time stamp added when transmitting
Cautions 1. The ATS bit is used only for transmit messages.
2. When the ATS bit has been set (to 1) and the data length code specifies
at least two bytes, the last two bytes are replaced by a time stamp (see
Table 11-3). The added time stamp counter value is sent over the bus
via the SOF of the message. When this occurs, the last two bytes
(which are defined as a data field) are ignored.
Specifies the enable/disable setting for interrupt requests.
0: Interrupt requests disabled
1: Interrupt requests enabled
Cautions 1. An interrupt request is generated when interrupts are enabled under
the following conditions.
• • • • When a message is transmitted from the transmit message buffer
• • • • When a message is received by the receive message buffer
• • • • When a remote frame is transmitted from the receive message
buffer
• • • • When a remote frame is received by the transmit message buffer
when the auto acknowledge function has not been set (RMDE0 bit = 0)
2. An interrupt request is not generated when interrupts are enabled
under the following conditions.
• • • • When a remote frame is received by the transmit message buffer
when the auto acknowledge function has been set (RMDE0 bit = 1)
3. An interrupt request is generated under the following conditions even if
interrupts are disabled.
• • • • When a remote frame is received by the receive message buffer when
the auto acknowledge function has not been set (RMDE0 bit = 0)
This is the flag that indicates a message buffer overwrite.
0: Overwrite does not occur after DN bit is cleared
1: Overwrite occurs at least once after DN bit is cleared
Caution An overwrite of the message buffer occurs when the CAN module writes
new data to the message buffer or when the DN bit has already been set
(to 1). The MOVR bit is updated each time new data is stored in the
message buffer.
Specifies frame type.
0: Data frame transmit/receive
1: Remote frame transmit/receive
Caution When the RTR bit has been set (to 1) for a transmit message, a remote
frame is transmitted instead of a data frame.
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