mc9s12vr48 Freescale Semiconductor, Inc, mc9s12vr48 Datasheet - Page 440

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

LIN Physical Layer (S12LINPHYV1)
15.4.4
The interrupt vector requested by the LIN Physical Layer is listed in
interrupt priority is defined at MCU level.
The module internal interrupt sources are combined into one module interrupt source.
15.4.4.1
The output low side FET (transmitter) is protected against over-current. In case of an over-current
condition occurring within a time frame called t
through the transmitter is limited (the transmitter is not shut down), the transmitted data is lost and the bit
LPOC remains at 0. If an over-current occurs out of this time frame, the transmitter is shut down and the
bit LPOC in the LPSR register is set as long as the condition is present. The inhibition of an over-current
within the time frame t
the LIN bus during transition phases.
The bit LPOCIF is set to 1 when the status of LPOC changes and it remains set until it has been cleared
by writing a 1. If the bit LPOCIE is set in the LPIE register, an interrupt will be requested.
As long as LPOC is 1, the transmitter is disable.
15.5
15.5.1
In case of an over-current condition, the transmitter is switched off. The transmitter will stay disabled until
the condition is gone. At this moment it is up to the software to activate again the transmitter through the
RXONLY bit.
However, if the over-current occurs within a transition phase, the transmitter is internally limiting the
current but no over-current event will be reported. Indeed, charging/discharging the bus can cause
over-current events at each transition, which should not be reported. The time frame during which an
over-current is not reported is equal to t
440
Module Interrupt Source
Application Information
LIN Interrupt (LPI)
Interrupts
Over-current handling
Over-Current Interrupt
On entering Standby Mode (stop mode at the device level), the LPOCIF bit
is not cleared.
OCLIM
is meant to avoid “false” over-current conditions due to charging/discharging
MC9S12VR Family Reference Manual,
Preliminary - Subject to Change Without Notice
Table 15-12. Interrupt Vectors
Module Internal Interrupt
LIN Over-Current Interrupt
OCLIM
(LPOCI)
Source
starting from a rising or a falling edge of txd.
OCLIM
NOTE
starting from a transition on TXD, the current
LPOCIE = 1; available only in Normal Mode
Rev. 2.2
Table
15-12. Vector address and
Local Enable
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