Data Sheet
52
Rev. 1.00
2017-07-31
TLE9262-3BQX
Note:
When SYSERR is set then WUF frames will not be detected, i.e. the selective wake function is not
activated (no SWK), but the MSB of CAN mode is not changed in the register.
5.4.4.3
SBC Sleep Mode with SWK
In SBC Sleep Mode the CAN Transceiver can be switched into the following CAN Modes
• CAN OFF
• CAN WK Mode (without SWK)
• CAN SWK Mode
To enable “CAN SWK Mode” the CAN has to be switched to “CAN Normal Mode with SWK”, “CAN Receive Only
Mode with SWK” or to “CAN SWK Mode” in SBC Normal Mode before sending the device to SBC Sleep Mode.
The table shows the change of CAN mode when switching from SBC Normal Mode to Sleep Mode.
A wake from Sleep Mode with Selective Wake (Valid WUF) leads to Restart Mode. In Restart Mode the CFG_VAL
bit will be cleared by the SBC, the SYSERR bit is not set. In the register CAN_x the programmed CAN SWK Mode
(101) can be read.
To enable the CAN SWK Mode again and to enter SBC Sleep Mode the following sequence can be used;
Program a CAN Mode different from CAN SWK Mode (101, 110, 111), set the CFG_VAL, CLEAR SYSERR bit, Set
CAN_x bits to CAN SWK Mode (101), switch SBC to Sleep Mode.
To enable the CAN WK Mode or CAN SWK Mode again after a wake on CAN a rearming is required for the CAN
transceiver to be wake capable again. The rearming is done by programming the CAN into a different mode
with the CAN_x bit and back into the CAN WK Mode or CAN SWK Mode. To avoid lock-up when switching the
SBC into Sleep Mode with an already woken CAN transceiver, the SBC does an automatic rearming of the CAN
transceiver when switching into Sleep Mode. So after switching into Sleep Mode the CAN transceiver is either
in CAN SWK Mode or CAN WK Mode depending on CAN_x setting and SYSERR bit (If CAN is switched to OFF
Mode it is also OFF in Sleep Mode)
Table 10 CAN Modes change when switching from SBC Normal Mode to SBC Stop Mode
Programmed CAN Mode in SBC
Normal Mode
CAN_x
bits
SYSERR
bit
CAN Mode in SBC Stop Mode
CAN_x
bits
CAN OFF
000
0
CAN OFF
000
CAN WK Mode (no SWK)
001
0
CAN WK Mode (no SWK)
001
CAN Receive Only (no SWK)
010
0
CAN Receive Only (no SWK)
010
CAN Normal Mode (no SWK)
011
0
CAN WK Mode (no SWK)
011
CAN OFF
100
0
CAN OFF
100
CAN SWK Mode
101
0
CAN SWK Mode
101
CAN SWK Mode
101
1
CAN WK Mode (no SWK)
101
CAN Receive Only with SWK
110
0
CAN Receive Only with SWK
110
CAN Receive Only with SWK
110
1
CAN Receive Only (no SWK)
110
CAN Normal Mode with SWK
111
0
CAN Normal Mode with SWK
111
CAN Normal Mode with SWK
111
1
CAN Normal Mode (no SWK)
111
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