st7pmc2s6 STMicroelectronics, st7pmc2s6 Datasheet - Page 164

• Manufacturer Part Number: st7pmc2s6
• Description: 8-bit Mcu For Automotive With Nested Interrupts, Flash, 10-bit Adc, Brushless Motor Control, 5 Timers, Spi, Linsci?
• Manufacturer: STMicroelectronics

On-chip peripherals
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The time-out counter is enabled at each break detection. It is stopped in the following
situations:
If LHE bit is set due to this error during fields other than LIN synch field or if LASE bit is reset
then the current received header is discarded and the SCI searches for a new break field.
Note on LIN header time-out limit
According to the LIN specification, the maximum length of a LIN header which does not
cause a timeout is equal to 1.4 * (34 + 1) = 49 T
T
When checking this timeout, the slave node is desynchronized for the reception of the LIN
break and synch fields. Consequently, a margin must be allowed, taking into account the
worst case: This occurs when the LIN identifier lasts exactly 10 T
case, the LIN break and synch fields last 49 - 10 = 39 T
Assuming the slave measures these first 39 bits with a desynchronized clock of 15.5%. This
leads to a maximum allowed header length of:
39 x (1/0.845) T
A margin is provided so that the time-out occurs when the header length is greater than 57
T
occurs.
LIN header length
Even if no timeout occurs on the LIN header, it is possible to have access to the effective LIN
header length (T
condition given by the LIN protocol, at software level.
This feature is only available when LHDM bit = 1 or when LASE bit = 1.
Mute mode and errors
In mute mode when LHDM bit = 1, if an LHE error occurs during the analysis of the LIN
synch field or if a LIN header time-out occurs then the LHE bit is set but it does not wake up
from mute mode. In this case, the current header analysis is discarded. If needed, the
software has to reset LSF bit. Then the SCI searches for a new LIN header.
In mute mode, if a framing error occurs on data (which is not a break), it is discarded and the
FE bit is not set.
When LHDM bit = 1, any LIN header which respects the following conditions causes a
wake-up from mute mode:
BIT_MASTER
BIT_SLAVE
A LIN identifier field has been received
An LHE error occurred (other than a timeout error)
A software reset of LSF bit (transition from high to low) occurred during the analysis of
the LIN synch field
The LHE bit is set due to this error during the LIN synchr field (if LASE bit = 1) then the
SCI goes into a blocked state (LSF bit is set)
A valid LIN break field (at least 11 dominant bits followed by a recessive bit).
A valid LIN synch field (without deviation error).
A LIN identifier field without framing error. Note that a LIN parity error on the LIN
identifier field does not prevent wake-up from mute mode.
No LIN header time-out should occur during header reception.
periods. If it is less than or equal to 57 T
refers to the master baud rate.
BIT_MASTER
HEADER
ST7MC1K2-Auto, ST7MC1K6-Auto, ST7MC2S4-Auto, ST7MC2S6-Auto
) through the LHL register. This allows monitoring the T
+ 10 T
BIT_MASTER
= 56.15 T
BIT_MASTER
BIT_SLAVE
BIT_MASTER
BIT_SLAVE
.
periods, then no timeout
BIT_MASTER
periods.
periods. In this
FRAME_MAX