CANx_MCR field descriptions (continued)
Field
Description
This read-only bit indicates that FlexCAN is in Freeze mode and its prescaler is stopped. The Freeze
mode request cannot be granted until current transmission or reception processes have finished.
Therefore the software can poll the FRZACK bit to know when FlexCAN has actually entered Freeze
mode. If Freeze Mode request is negated, then this bit is negated after the FlexCAN prescaler is running
again. If Freeze mode is requested while FlexCAN is in a low power mode, then the FRZACK bit will be
set only when the low-power mode is exited. See Section "Freeze Mode". This bit is not affected by soft
reset.
NOTE: FRZACK will be asserted within 178 CAN bits from the freeze mode request by the CPU, and
negated within 2 CAN bits after the freeze mode request removal (see
).
0
FlexCAN not in Freeze mode, prescaler running.
1
FlexCAN in Freeze mode, prescaler stopped.
23
SUPV
Supervisor Mode
This bit configures the FlexCAN to be either in Supervisor or User mode. The registers affected by this bit
are marked as S/U in the Access Type column of the module memory map. Reset value of this bit is 1, so
the affected registers start with Supervisor access allowance only. This bit can be written only in Freeze
mode because it is blocked by hardware in other modes.
0
FlexCAN is in User mode. Affected registers allow both Supervisor and Unrestricted accesses.
1
FlexCAN is in Supervisor mode. Affected registers allow only Supervisor access. Unrestricted access
behaves as though the access was done to an unimplemented register location.
22
SLFWAK
Self Wake Up
This bit enables the Self Wake Up feature when FlexCAN is in a low-power mode other than Disable
mode. When this feature is enabled, the FlexCAN module monitors the bus for wake up event, that is, a
recessive-to-dominant transition.
If a wake up event is detected during Stop mode, then FlexCAN generates, if enabled to do so, a Wake
Up interrupt to the CPU so that it can exit Stop mode globally and FlexCAN can request to resume the
clocks.
When FlexCAN is in a low-power mode other than Disable mode, this bit cannot be written as it is blocked
by hardware.
0
FlexCAN Self Wake Up feature is disabled.
1
FlexCAN Self Wake Up feature is enabled.
21
WRNEN
Warning Interrupt Enable
When asserted, this bit enables the generation of the TWRNINT and RWRNINT flags in the Error and
Status Register 1 (ESR1). If WRNEN is negated, the TWRNINT and RWRNINT flags will always be zero,
independent of the values of the error counters, and no warning interrupt will ever be generated. This bit
can be written in Freeze mode only because it is blocked by hardware in other modes.
0
TWRNINT and RWRNINT bits are zero, independent of the values in the error counters.
1
TWRNINT and RWRNINT bits are set when the respective error counter transitions from less than 96
to greater than or equal to 96.
20
LPMACK
Low-Power Mode Acknowledge
This read-only bit indicates that FlexCAN is in a low-power mode (Disable mode, Stop mode). A low-
power mode cannot be entered until all current transmission or reception processes have finished, so the
CPU can poll the LPMACK bit to know when FlexCAN has actually entered low power mode. This bit is
not affected by soft reset.
Table continues on the next page...
Memory map/register definition
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
1394
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...