Receiving Remote Frames; Remote Frame Receive Procedure - Renesas M32R/ECU Series User Manual

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13.8 Receiving Remote Frames

13.8.1 Remote Frame Receive Procedure

The following describes the procedure for receiving remote frames.
(1) Initializing the CAN Message Slot Control Register
Initialize the CAN Message Slot Control Register for the slot in which to receive by writing H'00 to the register.
(2) Confirming that reception is idle
Read the CAN Message Slot Control Register that has just been initialized and check the TRSTAT (Transmit/
Receive Status) bit to see that reception has stopped and remains idle. If this bit = "1", it means that the CAN
module is accessing the message slot. Therefore, wait until the bit is cleared to "0".
(3) Setting the receive ID
Set the desired receive ID in the message slot.
(4) Setting the Extended ID Register
Set the corresponding bit in the Extended ID Register to "0" if a standard frame is to be received, or "1" if an
extended frame is to be received.
(5) Setting the CAN Message Slot Control Register
1) When automatic response (data frame transmission) for remote frame reception is desired
Write H'60 to the CAN Message Slot Control Register to set the RR (Receive Request) bit and RM
(Remote) bit to "1".
2) When automatic response (data frame transmission) for remote frame reception is to be disabled
Write H'70 to the CAN Message Slot Control Register to set the RR (Receive Request) bit, RM (Remote)
bit and RL (Automatic Response Enable) bit to "1".
Note: • During BasicCAN mode, slots 14 and 15, although capable of receiving remote frames,
cannot automatically respond to remote frame reception.
13.8 Receiving Remote Frames
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CAN MODULE
32180 Group User's Manual (Rev.1.0)