CANx_IFLAG1 field descriptions (continued)
Field
Description
5
BUF5I
Buffer MB5 Interrupt Or "Frames available in Rx FIFO"
When the RFEN bit in the MCR is cleared (Rx FIFO disabled), this bit flags the interrupt for MB5.
NOTE: This flag is cleared by the FlexCAN whenever the bit MCR[RFEN] is changed by CPU writes.
When MCR[RFEN] is set (Rx FIFO enabled), the BUF5I flag represents "Frames available in Rx FIFO"
and indicates that at least one frame is available to be read from the Rx FIFO. When the MCR[DMA] bit is
enabled, this flag generates a DMA request and the CPU must not clear this bit by writing 1 in BUF5I.
0
No occurrence of MB5 completing transmission/reception when MCR[RFEN]=0, or of frame(s)
available in the FIFO, when MCR[RFEN]=1
1
MB5 completed transmission/reception when MCR[RFEN]=0, or frame(s) available in the Rx FIFO
when MCR[RFEN]=1. It generates a DMA request in case of MCR[RFEN] and MCR[DMA] are
enabled.
4–1
BUF4TO1I
Buffer MB
i
Interrupt Or "reserved"
When the RFEN bit in the CAN_MCR register is cleared (Rx FIFO disabled), these bits flag the interrupts
for MB4 to MB1.
NOTE: These flags are cleared by the FlexCAN whenever the bit CAN_MCR[RFEN] is changed by CPU
writes.
The BUF4TO1I flags are reserved when CAN_MCR[RFEN] is set.
0
The corresponding buffer has no occurrence of successfully completed transmission or reception
when MCR[RFEN]=0.
1
The corresponding buffer has successfully completed transmission or reception when MCR[RFEN]=0.
0
BUF0I
Buffer MB0 Interrupt Or Clear FIFO bit
When the RFEN bit in MCR is cleared (Rx FIFO disabled), this bit flags the interrupt for MB0. If the Rx
FIFO is enabled, this bit is used to trigger the clear FIFO operation. This operation empties FIFO contents.
Before performing this operation the CPU must service all FIFO related IFLAGs. When the bit MCR[DMA]
is enabled this operation also clears the BUF5I flag and consequently abort the DMA request. The clear
FIFO operation occurs when the CPU writes 1 in BUF0I. It is only allowed in Freeze Mode and is blocked
by hardware in other conditions.
0
The corresponding buffer has no occurrence of successfully completed transmission or reception
when MCR[RFEN]=0.
1
The corresponding buffer has successfully completed transmission or reception when MCR[RFEN]=0.
50.4.12 Control 2 register (CANx_CTRL2)
This register complements Control1 Register providing control bits for memory write
access in Freeze Mode, for extending FIFO filter quantity, and for adjust the operation of
internal FlexCAN processes like matching and arbitration.
The contents of this register are not affected by soft reset.
Chapter 50 CAN (FlexCAN)
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
NXP Semiconductors
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