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Chapter 23 LIN Controller (LINFlex)
MPC5606BK Microcontroller Reference Manual, Rev. 2
426
Freescale Semiconductor
23.5.1
Initialization mode
The software can be initialized while the hardware is in Initialization mode. To enter this mode the
software sets the INIT bit in the LINCR1.
To exit Initialization mode, the software clears the INIT bit.
While in Initialization mode, all message transfers to and from the LIN bus are stopped and the status of
the LIN bus output LINTX
is recessive (high).
Entering Initialization mode does not change any of the configuration registers.
To initialize the LINFlex controller, the software selects the mode (LIN Master, LIN Slave or UART), sets
up the baud rate register and, if LIN Slave mode with filter activation is selected, initializes the identifier
list.
23.5.2
Normal mode
Once initilization is complete, software clears the INIT bit in the LINCR1 to put the hardware into Normal
mode.
23.5.3
Low power mode (Sleep)
To reduce power consumption, LINFlex has a low power mode called Sleep mode. To enter Sleep mode,
software sets the SLEEP bit in the LINCR1. In this mode, the LINFlex clock is stopped. Consequently, the
LINFlex will not update the status bits but software can still access the LINFlex registers.
LINFlex can be awakened (exit Sleep mode) either by software clearing the SLEEP bit or on detection of
LIN bus activity if automatic wake-up mode is enabled (AWUM bit is set).
On LIN bus activity detection, hardware automatically performs the wake-up sequence by clearing the
SLEEP bit if the AWUM bit in the LINCR1 is set. To exit from Sleep mode if the AWUM bit is cleared,
software clears the SLEEP bit when a wake-up event occurs.
23.6
Test modes
Two test modes are available to the user: Loop Back mode and Self Test mode. They can be selected by
the LBKM and SFTM bits in the LINCR1. These bits must be configured while LINFlex is in Initialization
mode. Once one of the two test modes has been selected, LINFlex must be started in Normal mode.
23.6.1
Loop Back mode
LINFlex can be put in Loop Back mode by setting the LBKM bit in the LINCR. In Loop Back mode, the
LINFlex treats its own transmitted messages as received messages.
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