Controller area network (bxCAN) RM0351
1598/1830 DocID024597 Rev 5
CAN transmit status register (CAN_TSR)
Address offset: 0x08
Reset value: 0x1C00 0000
Bit 4 SLAKI: Sleep acknowledge interrupt
When SLKIE=1, this bit is set by hardware to signal that the bxCAN has entered Sleep
Mode. When set, this bit generates a status change interrupt if the SLKIE bit in the
CAN_IER register is set.
This bit is cleared by software or by hardware, when SLAK is cleared.
Note: When SLKIE=0, no polling on SLAKI is possible. In this case the SLAK bit can be
polled.
Bit 3 WKUI
: Wakeup interrupt
This bit is set by hardware to signal that a SOF bit has been detected while the CAN
hardware was in Sleep mode. Setting this bit generates a status change interrupt if the
WKUIE bit in the CAN_IER register is set.
This bit is cleared by software.
Bit 2 ERRI: Error interrupt
This bit is set by hardware when a bit of the CAN_ESR has been set on error detection and
the corresponding interrupt in the CAN_IER is enabled. Setting this bit generates a status
change interrupt if the ERRIE bit in the CAN_IER register is set.
This bit is cleared by software.
Bit 1 SLAK: Sleep acknowledge
This bit is set by hardware and indicates to the software that the CAN hardware is now in
Sleep mode. This bit acknowledges the Sleep mode request from the software (set SLEEP
bit in CAN_MCR register).
This bit is cleared by hardware when the CAN hardware has left Sleep mode (to be
synchronized on the CAN bus). To be synchronized the hardware has to monitor a
sequence of 11 consecutive recessive bits on the CAN RX signal.
Note: The process of leaving Sleep mode is triggered when the SLEEP bit in the CAN_MCR
register is cleared. Refer to the AWUM bit of the CAN_MCR register description for
detailed information for clearing SLEEP bit
Bit 0 INAK
: Initialization acknowledge
This bit is set by hardware and indicates to the software that the CAN hardware is now in
initialization mode. This bit acknowledges the initialization request from the software (set
INRQ bit in CAN_MCR register).
This bit is cleared by hardware when the CAN hardware has left the initialization mode (to
be synchronized on the CAN bus). To be synchronized the hardware has to monitor a
sequence of 11 consecutive recessive bits on the CAN RX signal.
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
LOW2 LOW1 LOW0 TME2 TME1 TME0 CODE[1:0] ABRQ2 Res. Res. Res. TERR2 ALST2 TXOK2 RQCP2
r r r r r r r r rs rc_w1 rc_w1 rc_w1 rc_w1
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
ABRQ1 Res. Res. Res. TERR1 ALST1 TXOK1 RQCP1 ABRQ0 Res. Res. Res. TERR0 ALST0 TXOK0 RQCP0
rs rc_w1 rc_w1 rc_w1 rc_w1 rs rc_w1 rc_w1 rc_w1 rc_w1
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