The arbitration process selects the winner among the active Tx Mailboxes at the end of
the scan according to both CAN_CTRL1[LBUF] and CAN_MCR[LPRIOEN] bits
settings.
50.5.2.1 Lowest-number Mailbox first
If CAN_CTRL1[LBUF] bit is asserted the first (lowest number) active Tx Mailbox found
is the arbitration winner. CAN_MCR[LPRIOEN] bit has no effect when
CAN_CTRL1[LBUF] is asserted.
50.5.2.2 Highest-priority Mailbox first
If CAN_CTRL1[LBUF] bit is negated, then the arbitration process searches the active Tx
Mailbox with the highest priority, which means that this Mailbox’s frame would have a
higher probability to win the arbitration on CAN bus when multiple external nodes
compete for the bus at the same time.
The sequence of bits considered for this arbitration is called the arbitration value of the
Mailbox. The highest-priority Tx Mailbox is the one that has the lowest arbitration value
among all Tx Mailboxes.
If two or more Mailboxes have equivalent arbitration values, the Mailbox with the lowest
number is the arbitration winner.
The composition of the arbitration value depends on CAN_MCR[LPRIOEN] bit setting.
50.5.2.2.1 Local Priority disabled
If CAN_MCR[LPRIOEN] bit is negated the arbitration value is built in the exact
sequence of bits as they would be transmitted in a CAN frame (see the following table) in
such a way that the Local Priority is disabled.
Table 50-10. Composition of the arbitration value when Local Priority is disabled
Format
Mailbox Arbitration Value (32 bits)
Standard (IDE = 0)
Standard ID (11
bits)
RTR (1 bit)
IDE (1 bit)
- (18 bits)
- (1 bit)
Extended (IDE = 1) Extended ID[28:18]
(11 bits)
SRR (1 bit)
IDE (1 bit)
Extended ID[17:0]
(18 bits)
RTR (1 bit)
Functional description
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
1436
NXP Semiconductors
Содержание KE1xF Series
Страница 2: ...Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 2 NXP Semiconductors...
Страница 60: ...SysTick Clock Configuration Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 60 NXP Semiconductors...
Страница 114: ...Initialization application information Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 114 NXP Semiconductors...
Страница 138: ...Usage Guide Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 138 NXP Semiconductors...
Страница 320: ...Private Peripheral Bus PPB memory map Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 320 NXP Semiconductors...
Страница 342: ...Functional Description Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 342 NXP Semiconductors...
Страница 360: ...Usage Guide Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 360 NXP Semiconductors...
Страница 490: ...Interrupts Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 490 NXP Semiconductors...
Страница 550: ...Memory map and register definition Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 550 NXP Semiconductors...
Страница 562: ...Boot Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 562 NXP Semiconductors...
Страница 662: ...Power supply supervisor Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 662 NXP Semiconductors...
Страница 694: ...On chip resource access control mechanism Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 694 NXP Semiconductors...
Страница 706: ...Usage Guide Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 706 NXP Semiconductors...
Страница 724: ...Application Information Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 724 NXP Semiconductors...
Страница 736: ...Usage Guide Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 736 NXP Semiconductors...
Страница 750: ...Debug and Security Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 750 NXP Semiconductors...
Страница 798: ...Functional description Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 798 NXP Semiconductors...
Страница 808: ...Functional description Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 808 NXP Semiconductors...
Страница 866: ...Usage Guide Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 866 NXP Semiconductors...
Страница 1164: ...Usage Guide Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 1164 NXP Semiconductors...
Страница 1178: ...Usage Guide Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 1178 NXP Semiconductors...
Страница 1380: ...Usage Guide Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 1380 NXP Semiconductors...
Страница 1472: ...Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 1472 NXP Semiconductors...
Страница 1482: ...Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 1482 NXP Semiconductors...