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13.4 Initializing the CAN Module
13.4.1 Initialization of the CAN Module
Before you perform communication, set up the CAN module as described below.
(1) Selecting pin functions
The CAN transmit data output pin (CTX) and CAN data receive input pin (CRX) are shared with
input/output ports, so be sure to select the functions of these pins. (Refer to Chapter 8, "Input/
Output Ports and Pin Functions."
(2) Setting the interrupt controller (ICU)
When you use CAN module interrupts, set the interrupt priority.
(3) Setting CAN Error Interrupt Mask and CAN Slot Interrupt Mask Registers
When you use CAN bus error interrupts, CAN error passive interrupts, CAN error bus-off
interrupts, or CAN slot interrupts, set each corresponding bit to 1 to enable interrupt requests.
(4) Setting bit timing and the number of times sampled
Using the CAN Configuration Register and CAN Baud Rate Prescaler, set the bit timing and the
number of times the CAN bus is sampled.
➀
Setting the bit timing
Determine the period Tq that is the base of bit timing, the configuration of Propagation
Segment, Phase Segment1, and Phase Segment2, and reSynchronization Jump Width.
The equation to calculate Tq is shown below.
Tq = (1) /CPU clock
The baud rate is determined by the number of Tq's that comprise one bit. The equation to
calculate the baud rate is shown below.
Number of Tq's for 1 bit = Synchronization S
Propagation S
Phase Segment 1 +
Phase Segment 2
Baud rate (bps) =
1
Tq period
×
number of Tq's for 1 bit
CAN MODULE
13.4 Initializing the CAN Module
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 ...