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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
Содержание M32170F3VFP
Страница 19: ...CHAPTER 1 CHAPTER 1 OVERVIEW 1 1 Outline of the 32170 1 2 Block Diagram 1 3 Pin Function 1 4 Pin Layout ...
Страница 42: ...1 1 24 Ver 0 10 OVERVIEW 1 4 Pin Layout This is a blank page ...
Страница 56: ...2 2 14 Ver 0 10 This is a blank page ...
Страница 88: ...3 3 32 Ver 0 10 ADDRESS SPACE 3 7 Notes on Address Space This is a blank page ...
Страница 192: ...6 6 58 Ver 0 10 INTERNAL MEMORY 6 9 Precautions to Be Taken When Rewriting Flash Memory This is a blank page ...
Страница 270: ...9 9 40 Ver 0 10 DMAC 9 4 Precautions about the DMAC This is a blank page ...
Страница 498: ...10 10 228 Ver 0 10 MULTIJUNCTION TIMERS 10 9 TOM Output related 16 bit Timer This is a blank page ...
Страница 550: ...11 11 52 Ver 0 10 A D CONVERTERS 11 4 Precautions on Using A D Converters This is a blank page ...
Страница 614: ...12 12 64 Ver 0 10 This is a blank page SERIAL I O 12 9 Precautions on Using UART Mode ...
Страница 710: ...14 14 16 Ver 0 10 REAL TIME DEBUGGER RTD 14 4 Typical Connection with the Host This is a blank page ...
Страница 746: ...16 16 20 Ver 0 10 WAIT CONTROLLER 16 3 Typical Operation of the Wait Controller This is a blank page ...
Страница 756: ...17 17 10 Ver 0 10 RAM BACKUP MODE 17 4 Exiting RAM Backup Mode Wakeup This is a blank page ...
Страница 757: ...CHAPTER 18 CHAPTER 18 OSCILLATION CIRCUIT 18 1 Oscillator Circuit 18 2 Clock Generator Circuit ...
Страница 762: ...18 18 6 Ver 0 10 OSCILLATION CIRCUIT 18 2 Clock Generator Circuit This is a blank page ...
Страница 798: ...19 19 36 Ver 0 10 JTAG 19 6 Precautions about Board Design when Connecting JTAG This is a blank page ...
Страница 830: ...21 21 24 Ver 0 10 PRELIMINARY PRELIMINARY This is a blank page ELECTRICAL CHARACTERISTICS 21 5 AC Characteristics ...
Страница 831: ...CHAPTER 22 CHAPTER 22 TYPICAL CHARACTERISTICS 22 1 A D Conversion Characteristics ...
Страница 833: ...Appendix 1 1 Dimensional Outline Drawing APPENDIX 1 APPENDIX 1 MECHANICAL SPECIFICATIONS ...
Страница 837: ...Appendix 2 1 32170 Instruction Processing Time APPENDIX 2 APPENDIX 2 INSTRUCTION PROCESSING TIME ...
Страница 841: ...Appendix 3 1 Precautions about Noise APPENDIX 3 APPENDIX 3 PRECAUTIONS ABOUT NOISE ...