Basic Can Mode - Renesas M16C/60 Series Hardware Manual

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M16C/6N5 Group

Basic CAN Mode

When the BasicCAN bit of the C0CTLR register is set to "1", slots 14 and 15 correspond to Basic CAN
mode. When slots 14 and 15 are defined as reception slots in Basic CAN mode, received messages are
stored in slots 14 and 15 alternately.
Figure 1.19.25 shows the operation of slots 14 and 15 in Basic CAN mode.
Slot 14
Slot 15
Figure 1.19.25 Operation of Slots 14 and 15 in Basic CAN Mode
When configuring Basic CAN mode, note the following points.
(1) Selection of Basic CAN mode has to be done in reset/initialization mode.
(2) Select the same ID for slots 14 and 15. Also, configuration of the C0LMAR register and that of the
C0LMBR register has to be the same.
(3) Define slots 14 and 15 as reception slot only.
(4) There is no protection available against message overwrite. A message can be overwritten by a new
message.
(5) Slots 0 to 13 can be used in the same way as in normal CAN operation mode.
Rev.1.00 2003.05.30 page 222
Empty
Msg n
Locked (empty) Locked (empty)
Msg n Msg n+1
(Msg n) Msg n+2 (Msg n lost)
Locked
Locked (Msg n+1)
Msg n + 1
Msg n+2
CAN Module