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Ver.0.10
13.7.2 Remote Frame Transmit Operation
The following describes remote frame transmit operation. The operations described below are
automatically performed in hardware.
(1) Setting the RA (Remote Active) bit
At the same time H'A0 (Transmit Request, Remote) is written to the CAN Message Slot Control
Register, the RA (Remote Active) bit is set to 1, indicating that the corresponding slot is to handle
remote frames.
(2) Selecting a transmit frame
The CAN module checks slots which have transmit requests (including data frame transmit slots)
every intermission to determine the frame to transmit. If there are multiple transmit slots, frames
are transmitted in order of slot numbers beginning with the smallest.
(3) Transmitting a remote frame
After determining the transmit slot, the CAN module sets the corresponding CAN Message Slot
Control Register's TRSTAT (Transmit/Receive Status) bit to 1, thereby starting transmission.
(4) If the CAN module lost bus arbitration or a CAN bus error occurs
If the CAN module lost bus arbitration or a CAN bus error occurs while transmitting, the CAN
module clears the CAN Message Slot Control Register's TRSTAT (Transmit/Receive Status) bit
to 0. If the CAN module requested a transmit abort, the transmit abort is accepted and writing to
the message slot is enabled.
(5) Completion of remote frame transmission
When remote frame transmission is completed, a time stamp count value at the time
transmission was completed is written to the CAN Message Slot Time Stamp (C0MSLnTSP) and
the CAN Message Slot Control Register's RA (Remote Active) bit is cleared to 0. Also, the CAN
Slot Interrupt Status bit is set to 1 by completion of transmission, but the CAN Message Slot
Control Register's TRFIN (Transmit/Receive Finished) bit is not set to 1. If the CAN slot interrupt
has been enabled, an interrupt request is generated upon completion of transmission.
(6) Receiving a data frame
When remote frame transmission is completed, the slot automatically starts functioning as a data
frame receive slot.
(7) Acceptance filtering
When the CAN module finished receiving data, it starts searching for the slot that satisfies
conditions for receiving the received message sequentially from slot 0 (up to slot 15).
CAN MODULE
13.7 Transmitting Remote Frames
Summary of Contents for M32170F3VFP
Page 42: ...1 1 24 Ver 0 10 OVERVIEW 1 4 Pin Layout This is a blank page ...
Page 56: ...2 2 14 Ver 0 10 This is a blank page ...
Page 88: ...3 3 32 Ver 0 10 ADDRESS SPACE 3 7 Notes on Address Space This is a blank page ...
Page 270: ...9 9 40 Ver 0 10 DMAC 9 4 Precautions about the DMAC This is a blank page ...
Page 614: ...12 12 64 Ver 0 10 This is a blank page SERIAL I O 12 9 Precautions on Using UART Mode ...
Page 756: ...17 17 10 Ver 0 10 RAM BACKUP MODE 17 4 Exiting RAM Backup Mode Wakeup This is a blank page ...
Page 762: ...18 18 6 Ver 0 10 OSCILLATION CIRCUIT 18 2 Clock Generator Circuit This is a blank page ...
Page 831: ...CHAPTER 22 CHAPTER 22 TYPICAL CHARACTERISTICS 22 1 A D Conversion Characteristics ...
Page 833: ...Appendix 1 1 Dimensional Outline Drawing APPENDIX 1 APPENDIX 1 MECHANICAL SPECIFICATIONS ...
Page 841: ...Appendix 3 1 Precautions about Noise APPENDIX 3 APPENDIX 3 PRECAUTIONS ABOUT NOISE ...