Data Sheet
54
Rev. 1.00
2017-07-31
TLE9262-3BQX
5.4.4.5
SBC Fail-Safe Mode with SWK
When SBC Fail-Safe Mode is entered the CAN transceiver is automatically set into WK Mode (wake capable)
without the selective wake function.
5.4.5
Wake-up
A wake-up via CAN leads to a restart out of SBC Sleep Mode and to an interrupt in SBC Normal Mode, and in
SBC Stop Mode. After the wake event the bit CAN_WU is set, and the details about the wake can be read out of
the bits WUP, WUF, SYSERR, and ECNT.
5.4.6
Configuration for SWK
The CAN protocol handler settings can be configured in following registers:
•
SWK_BTL1_CTRL
defines the number of time quanta in a bit time. This number depends also on the
internal clock settings performed in the register
SWK_CDR_CTRL2
;
•
SWK_BTL2_CTRL
defines the sampling point position;
• The respective receiver during frame detection mode can be selected via the bit
RX_WK_ SEL
;
• The clock and data recovery (see also
Chapter 5.4.8
) can be configured in the registers
SWK_CDR_CTRL1
,
SWK_CDR_CTRL2
,
SWK_CDR_LIMIT_HIGH_CTRL
and
SWK_CDR_LIMIT_LOW_CTRL
;
Table 13 CAN Modes change in case of Restart out of SBC Sleep Mode
CAN Mode in SBC
Sleep Mode
CAN Mode in
and after SBC
Restart Mode
CAN_
x
SYS
ERR
CAN_
WU
WUP WUF ECNT_
x
Reason for Restart
CAN OFF
CAN OFF
000
0
0
0
0
0
Wake on other wake
source
CAN WK Mode
CAN woken up 001
0
1
1
0
0
Wake (WUP) on CAN
CAN WK Mode
CAN WK Mode
001
0
0
0
0
0
Wake on other wake
source
CAN SWK Mode
CAN woken up 101
0
1
0/1
1)
1) In case there is a WUF detection within
t
SILENCE
then the WUP bit will not be set. Otherwise it will always be set together
with the WUF bit.
1
x
Wake (WUF) on CAN
CAN SWK Mode,
CAN woken up 101
1
1
0/1
2)
2) In some cases the WUP bit might stay cleared even after
t
SILENCE
, e.g. when the error counter expires without detecting
a wake up pattern
0
100000 Wake due to error
counter overflow
CAN SWK selected,
CAN WK active
CAN woken up. 101
1
1
1
0
0
Wake (WUP) on CAN,
config check was not
pass
CAN SWK Mode
CAN WK Mode
101
1
0
0/1
0
x
Wake on other wake
source
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