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

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13.6 Receiving Data Frames

13.6.1 Data Frame Receive Procedure

The following describes the procedure for receiving data 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
Write H'40 to the CAN Message Slot Control Register to set the RR (Receive Request) bit to "1".
13.6 Receiving Data Frames
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CAN MODULE
32180 Group User's Manual (Rev.1.0)