TLE9221SX Datasheet, PDF (29/91 Pages) Infineon Technologies AG – FlexRay Transceiver

TLE9221SX
Wake-up Detector
uBus
wake-up symbol
wake-up pattern
wake-up symbol
“Data_1”
“Data_1”
“Data_0”
dWU_0Detect
dWU_IdleDetect
dWU_Timeout
“Data_0”
dWU_0Detect
t
uData0_LP
dWU_IdleDetect
dWU_Interrupt
Figure 20 Wake-up by payload
7.3
Wake-up Flag and Wake-up Bits
The wake-up flag and the SIR latch the wake-up event and allow an external microcontroller to read out the wake-
up source. The TLE9221SX provides three bits in the SIR for the wake-up information:
• The local wake-up bit (bit 0)
• The remote wake-up bit (bit 1)
• The wake-up source bit (bit 12)
Even if the Wake-up detector is active in every operation mode, the wake-up bits can only be set in low power
mode or in the BD_GoToSleep command. In every other operation mode no wake-up bit is set (see Table 10).
The local wake-up bit is set in case the TLE9221SX detects a local wake-up event and in case of a remote wake-
up event the remote wake-up bit is set. A remote wake-up can be a wake-up either by a standard pattern, a wake-
up by an alternative pattern or a wake-up by payload.
In case the TLE9221SX detects a local and a remote wake-up event, both entries in the SIR bits are set.
Table 10 Setting the wake-up flag and the wake-up bits
Modes of Operation Wake-up Event Local
Remote
Wake-up Bit¹⁾ Wake-up Bit¹⁾
BD_GoToSleep
Remote
“high”
“low”
Local
“low”
“high”
BD_Standby
Remote
“high”
“low”
Local
“low”
“high”
BD_Sleep
Remote
“high”
“low”
Local
“low”
“high”
1) Not set = logical “high”, Set = logical “low”
Wake-up
Source Bit¹⁾
“low”
“high”
“low”
“high”
“low”
“high”
Wake-up Flag¹⁾
“low”
“low”
“low”
“low”
“low”
“low”
Concurrent with the local wake-up bit or with the remote wake-up bit, the wake-up source bit and the wake-up flag
are set. The wake-up source bit is “high” when detecting a local wake-up event and “low” when a remote wake-up
Data Sheet
29
Rev. 1.10, 2013-07-15