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Controller area network (bxCAN)
RM0008
Bit 0 INRQ : Initialization request
The software clears this bit to switch the hardware into normal mode. Once 11 consecutive
recessive bits have been monitored on the Rx signal the CAN hardware is synchronized and
ready for transmission and reception. Hardware signals this event by clearing the INAK bit in
the CAN_MSR register.
Software sets this bit to request the CAN hardware to enter initialization mode. Once
software has set the INRQ bit, the CAN hardware waits until the current CAN activity
(transmission or reception) is completed before entering the initialization mode. Hardware
signals this event by setting the INAK bit in the CAN_MSR register.
CAN master status register (CAN_MSR)
Address offset: 0x04
Reset value: 0x0000 0C02
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
Reserved
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
RX
SAMP
RXM
TXM
SLAKI
WKUI
ERRI
SLAK
INAK
Reserved.
Reserved
r
r
r
r
rc_w1
rc_w1
rc_w1
r
r
Bits 31:12
Reserved, forced by hardware to 0.
Bit 11 RX : CAN Rx signal
Monitors the actual value of the CAN_RX Pin.
Bit 10 SAMP : Last sample point
The value of RX on the last sample point (current received bit value).
Bit 9 RXM : Receive mode
The CAN hardware is currently receiver.
Bit 8 TXM : Transmit mode
The CAN hardware is currently transmitter.
Bits 7:5
Reserved, forced by hardware to 0.
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.
564/995
Doc ID 13902 Rev 9
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