m30833fjgp Renesas Electronics Corporation., m30833fjgp Datasheet - Page 371

• Manufacturer Part Number: m30833fjgp
• Description: Renesas 16/32-bit Single-chip Microcomputer M16c Family / M32c/80 Series
• Manufacturer: Renesas Electronics Corporation.

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22.1.16.5 RSPLOCK Bit
22.1.16.6 REMOTE Bit
22.1.16.7 RECREQ Bit
22.1.16.8 TRMREQ Bit
The RSPLOCK bit is valid only when remote frame reception shown in Table 22.4 is selected. The
RSPLOCK bit determines whether the received remote frame is processed or not.
When the RSPLOCK bit is set to "0" (automatic answering of the remote frame enabled), the slot
automatically changes to a transmit slot after the remote frame is received, and the message stored
into the message slot is automatically transmitted as the data frame.
When the RSPLOCK bit is set to "1" (automatic answering of the remote frame disabled), message is
not automatically transmitted upon receiving the remote frame.
Set the RSPLOCK bit to "0" to select any transmit/receive mode other than the remote frame recep-
tion.
The REMOTE bit selects transmit/receive mode shown in Table 22.4. Set the REMOTE bit to "0" to
transmit or receive data frame. Set to "1" to transmit or receive remote frame.
The followings occur during remote frame transmission or reception.
The RECREQ bit selects transmit/receive mode shown in Table 22.4. 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).
The TRMREQ bit selects transmit/receive mode shown in Table 22.4. 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).
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• Transmitting the remote frame
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• Receiving the remote frame
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A message stored into the message slot i (i=0 to 15) is transmitted as the remote frame. After
transmission, the slot automatically becomes ready to receive data frame.
If the data frame is received before the remote frame is transmitted, the data frame is stored into
the message slot i. The remote frame is not transmitted.
The message slot receives the remote frame. The RSPLOCK bit determines whether or not to
process the received remote frame.
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22. CAN Module