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13-54
32180 Group User’s Manual (Rev.1.0)
CAN MODULE
13.2 CAN Module Related Registers
123456b7(b15)(b8)b0
RMRRTR RL RA ML TRSTAT TRFIN
00000000
<After reset: H’00>
b Bit Name Function R W
0 TR 0: Do not use the message slot as transmit slot R W
Transmit request bit 1: Use the message slot as transmit slot
1 RR 0: Do not use the message slot as receive slot R W
Receive request bit 1: Use the message slot as receive slot
2 RM 0: Transmit/receive data frame R W
Remote bit 1: Transmit/receive remote frame
3 RL 0: Enable automatic response for remote frame R W
Automatic response inhibit bit 1: Disable automatic response for remote frame
4 RA During BasicCAN mode R –
Remote active bit 0: Receive data frame (status)
1: Receive remote frame (status)
During normal mode
0: Data frame
1: Remote frame
5 ML 0: No message was lost R(Note 1)
Message lost bit 1: Message was lost
6 TRSTAT During a transmit slot R –
Transmit/receive status bit 0: Transmission idle
1: Transmit request accepted
During a receive slot
0: Reception idle
1: Storing received data
7 TRFIN During a transmit slot R(Note 1)
Transmission/reception completed 0: Not transmitted yet
1: Finished transmitting
During a receive slot
0: Not received yet
1: Finished receiving
Note 1: Only writing "0" is effective. Writing "1" has no effect; the bit retains the status it had before the write.
Notes: • If a transmit request is written to this register while the CAN module is reset (CANnCNT FRST
or RST bit = "1"), it starts sending upon detecting 11 consecutive recessive bits on the CAN bus
after exiting the reset state.
• If data/remote frame transmit requests are issued for two or more slots, the slot with the small-
est slot number sends a frame. If data/remote frame receive requests are issued for two or
more slots, the slot with the smallest slot number receives a frame.
• If transmission failed when single-shot mode is selected, this register is cleared to H’00.
(1) TR (Transmit Request) bit (Bit 0)
To use the message slot as a transmit slot, set this bit to "1". To use the message slot as a data frame or
remote frame receive slot, set this bit to "0".
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