ST7MC1K2-Auto datasheet(166/371 Pages) STMICROELECTRONICS

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Three registers are used internally to manage the auto-update of the LIN divider (LDIV):

●

LDIV_NOM (nominal value written by software at LPR/LPFR addresses).

●

LDIV_MEAS (results of the field synch measurement).

●

LDIV (used to generate the local baud rate).

The control and interactions of these registers is explained in Figure 70 and Figure 71. It

depends on the LDUM bit setting (LIN divider update method)

Note:

As explained in Figure 70 and Figure 71, LDIV can be updated by two concurrent actions: a

transfer from LDIV_MEAS at the end of the LIN sync field and a transfer from LDIV_NOM

due to a software write of LPR. If both operations occur at the same time, the transfer from

LDIV_NOM has priority.

Figure 70.

LDIV read/write operations when LDUM = 0

MANT(7:0)

LDIV

FRAC(3:0)

LDIV_NOM

Baud rate generation

Read LPR

Write LPFR

Update

at end of

synch field

FRAC(3:0)

MANT(7:0)

LDIV_MEAS

FRAC(3:0)

MANT(7:0)

Write LPR

Read LPFR

LIN sync field

measurement

Write LPR

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ST7MC1K2-Auto Datasheet(PDF) 166 Page - STMicroelectronics

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