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CHAPTER 23 CAN CONTROLLER
23.16
Precautions when Using CAN Controller
Use of the CAN Controller requires the following cautions.
■
For -H Devices, e.q. MB90F394H and MB90V390H: Caution for Disabling Message
Buffers by BVAL Bits
The use of BVAL bits may affect malfunction of CAN Controller when messages buffers are set disabled
while CAN Controller is participating in CAN communication (the read value of the CSR: HALT bit is "0"
and CAN Controller is ready to transmit messages). This section shows the work around of this
malfunction.
●
Condition
When following two conditions occur at the same time, the CAN Controller will not perform to transmit
messages normally.
•
CAN Controller is participating in the CAN communication. (i.e. The read value of the CSR: HALT bit
is" 0" and CAN Controller is ready to transmit messages)
•
Message buffers are read when BVAL bits disable the message buffers.
●
Work around
Operation for suppressing transmission request
Do not use BVAL bit for suppressing transmission request, use TCAN bit instead of it.
Operation for composing transmission message
For composing a transmission message, it is necessary to disable the message buffer by BVAL bit of
Message Buffer Valid Register to change contents of ID and IDE registers. In this case, BVAL bit
should reset (BVAL=0) after checking if TREQ bit is "0" or after completion of the previous message
transmission (TC=1).
In case a buffer needs to be disabled, ensure that no transmission request is pending (if it was requested
before). Therefore, do not reset BVALx-Bit before testing, if a transmission is ongoing:
a) Cancel the transmission request (TCANx=1;), if necessary
b) and wait for the transmission completion (while (TREQx=1);) by polling or interrupt.
Only after that the transmission buffer can be disabled (BVALx=0;).
Note for case a), if transmission of that buffer has already started, canceling the request is ignored and
disabling the buffer is delayed until the end of the transmission.
Содержание MB90390 Series
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Страница 17: ...xiii APPENDIX D List of Interrupt Vectors 690 INDEX 695 ...
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Страница 132: ...104 CHAPTER 5 CLOCKS ...
Страница 152: ...124 CHAPTER 6 CLOCK MODULATOR ...
Страница 210: ...182 CHAPTER 11 TIME BASE TIMER ...
Страница 218: ...190 CHAPTER 12 WATCHDOG TIMER ...
Страница 264: ...236 CHAPTER 14 16 BIT RELOAD TIMER WITH EVENT COUNT FUNCTION ...
Страница 274: ...246 CHAPTER 15 WATCH TIMER ...
Страница 306: ...278 CHAPTER 17 DTP EXTERNAL INTERRUPTS ...
Страница 338: ...310 CHAPTER 18 8 10 BIT A D CONVERTER ...
Страница 364: ...336 CHAPTER 19 UART0 UART1 ...
Страница 398: ...370 CHAPTER 20 UART2 UART3 Figure 20 5 2 ORE Set Timing Receive data RDRF ORE ...
Страница 432: ...404 CHAPTER 20 UART2 UART3 ...
Страница 482: ...454 CHAPTER 22 SERIAL I O ...
Страница 560: ...532 CHAPTER 24 STEPPING MOTOR CONTROLLER ...
Страница 582: ...554 CHAPTER 27 ROM MIRRORING MODULE ...
Страница 632: ...604 CHAPTER 29 EXAMPLES OF SERIAL PROGRAMMING CONNECTION ...
Страница 722: ...694 APPENDIX ...
Страница 723: ...695 INDEX The index follows on the next page This is listed in alphabetic order ...
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