AN1278 datasheet(19/44 Pages) STMICROELECTRONICS

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LIN (LOCAL INTERCONNECT NETWORK) SOLUTIONS

#define BAUDRATE

#define BRR

#define ExPR

Note: Here is a list of baudrates and corresponding settings of (BRR,ExPR) depending on the

CPU frequency. Note that there are some small differences in the SCI prescaler between for

example the ST72324/321/521 and ST72314/334 derivatives. As a result the value of BRR

and ExPR may also depend on the MCU derivative.

Table 8. Example of (BRR,ExPR) values versus baudrate and fCPU

(*): fCPU=fOSC/2 if PLL is not used

#define ID_TABLE_SIZE

#define

BAUDRATE

Description

LIN communication speed in bit/s

#define

BRR, ExPR

Description

Needs to be defined only if SCI is defined.

Set both registers to obtain the baudrate previously

defined. BRR is the “baudrate register” and ExPR

will set the same value for both the “extended re-

ceive prescaler division register” and the “extended

transmit prescaler division register”. Refer to the

datasheet of the MCU you are using (“Serial Com-

munication Interface” chapter).

ST72x314/334/124

ST72x324/321/521

fCPU(*)

8MHz

4MHz2MHz8MHz4MHz2MHz

bit rate(bit/s)

(0xD2,0x00)

(0xC9,0x00) (0xC0,0x00) (0xDB,0x00) (0xD2,0x00) (0xC9,0x00)

4,8k

9,6k

(0xC9,0x00)

(0xC0,0x00) (0x00,0x0D) (0xD2,0x00) (0xC9,0x00) (0xC0,0x00)

19,2k

(0xC0,0x00)

(0x00,0x0D)

high quantifi-

cation error

(0xC9,0x00) (0xC0,0x00)

high quantifi-

cation error

20k

(0x00,0x19)

high quantifi-

cation error

high quantifi-

cation error

(0x00,0x19)

high quantifi-

cation error

high quantifi-

cation error

#define

ID_TABLE_SIZE

description

number of LIN frames to be handled by the applica-

tion. See Section 3.4

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