mc9s12vr48 Freescale Semiconductor, Inc, mc9s12vr48 Datasheet - Page 439

• Manufacturer Part Number: mc9s12vr48
• Description: S12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

15.4.3.2
The full functionality is available. Both receiver and transmitter are enabled. Per default (LPPUE = 1), the
internal pull-up resistor is the standard LIN slave specified pull-up (30kΩ). If LPPUE = 0, this resistor is
replaced by a high ohmic one (330kΩ).
If an over-current condition occurs, or if RXONLY is set to 1, the module is leaving the Normal Mode to
enter the Receive Only mode.
If the MCU goes into stop mode, the LIN Physical Layer goes into Standby Mode.
15.4.3.3
This mode has been entered because an over-current condition occurred, or because RXONLY has been
set to 1.The transmitter is disabled in this mode.
If this mode has been entered because of an over-current condition, RXONLY is set to 1 and can not be
cleared till the condition is gone( LPOC=0).
The receiver is running in full performance mode in all cases.
To return to Normal mode it is mandatory to set the RXONLY bit to 0.
Going into stop makes the module leave the Receive Only mode to enter the Standby Mode.
15.4.3.4
The transmitter of the physical layer is disabled. Like in the Normal and Receive Only Modes, the internal
pull-up resistor can be selected to be 30kΩ or 330kΩ to maintain the LIN Bus pin in the recessive state.
The receiver enters a low power mode.
If LPWUE is set to 0, no wake up feature is available and the Standby Mode has the same electrical
properties (current consumption, etc.) as the Shutdown Mode. This allows a low-power consumption when
the wake-up feature is not needed.
If LPWUE is set to 1 the receiver is able to pass wake-up events to the SCI (Serial Communication
Interface). If the LIN is receiving a dominant level longer than t
send a pulse to the SCI which generates a wake-up interrupt.
Once the MCU exits the stop mode, the LIN Physical Layer is going back to Normal or Receive Only mode
depending on the status of the bits LPOC and RXONLY.
Freescale Semiconductor
Normal Mode
Receive Only Mode
Standby Mode with wake-up feature
Since the wake-up interrupt is requested by the SCI, no wake-up feature is
available if the SCI is not used. (For example when using with a timer for
bit banging)
MC9S12VR Family Reference Manual, Rev. 2.2
Preliminary - Subject to Change Without Notice
NOTE
WUFR
followed by a rising edge, it will
LIN Physical Layer (S12LINPHYV1)
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