M32CSLASH86 datasheet(375/505 Pages) RENESAS

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Page 352

23. CAN Module

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23.1.20.7 RECREQ Bit

The RECREQ bit selects transmit/receive mode shown in Table 23.4. Set the RECREQ bit to "1"

(receive requested) when data frame or remote frame is received. Set the RECREQ bit to "0" (no

receive requested) when data frame or remote frame is transmitted.

When a data frame is automatically transmitted after a remote frame is received, the RECREQ bit

remains set to "1". Set the RECREQ bit to "0" to transmit a remote frame. After a remote frame is

transmitted, a data frame is automatically received while the RECREQ bit remains set to "0".

When setting the TRMREQ bit to "1" (transmit requested), do not set the RECREQ bit to "1" (receive

requested).

23.1.20.8 TRMREQ Bit

The TRMREQ bit selects transmit/receive mode shown in Table 23.4. Set the TRMREQ bit to "1"

(transmit requested) when data frame or remote frame is transmitted.

Set the TRMREQ bit to "0" (no request to transmit the frame) when data frame or remote frame is

received.

When the data frame is automatically received after the remote frame is transmitted, the TRMREQ bit

remains set to "1". Set the TRMREQ bit to "0" to receive the remote frame. After the remote frame is

received, data frame is automatically transmitted while the TRMREQ bit remains set to "0".

If the RECREQ bit is set to "1" (request to receive the frame), do not set the TRMREQ bit to "1" (

request to transmit the frame).

NOTES:

1. If some message slots are requested to transmit the data frame or remote frame, the message

slot, having the smallest slot number starts transmitting.

2. In single-shot mode, the CiMCTLj register is set to "0016" when data transmission is failed, due

to the arbitration lost or transmission error.

M32C/86 데이터시트(PDF) 375 Page - Renesas Technology Corp