ST7MC1K2 datasheet(178/371 Pages) STMICROELECTRONICS

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LHL register coding:

THEADER_MAX =57

LHL (7:2) represents the mantissa of (57 - THEADER) (see Table 77)

LHL (1:0) represents the fraction (57 - THEADER) (see Table 78)

Table 76.

LHLR register description

Bit

Name

Function

7:0 LHLR[7:0]

LIN header length

This is a read-only register, which is updated by hardware if one of the following

conditions occurs:

After each break detection, it is loaded with ‘FFh’

If a timeout occurs on THEADER, it is loaded with 00h

After every successful LIN header reception (at the same time as the setting of

LHDF bit), it is loaded with a value (LHL) which gives access to the number of

bit times of the LIN header length (THEADER). The coding of this value is

explained below.

Table 77.

LIN header mantissa values

LHL[7:2]

Mantissa (57 - THEADER)

Mantissa (THEADER)

...

39h

3Ah

3Bh

Never occurs

...

3Eh

Never occurs

3Fh

Initial value

Table 78.

LIN header fractions

LHL[1:0]

Fraction (57 - THEADER)

1/4

1/2

3/4

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