STM8S datasheet(390/467 Pages) STMICROELECTRONICS

390 / 467 page

Controller area network (beCAN)

RM0016

390/467

DocID14587 Rev 14

Note:

In 32-bit configuration, the FMLx and FMHx bits must have the same value to ensure that

the four Mask/Identifier registers are in the same mode.

When a standard identifier is received (IDE bit is zero), the extended part of 32-bit or 16-bit

filters is not compared.

To filter a group of identifiers, configure the Mask/Identifier registers in mask mode.

To select single identifiers, configure the Mask/Identifier registers in identifier list mode.

Filters not used by the application should be left deactivated.

Each filter within a filter bank is numbered (called the Filter Number) from 0 to a maximum

dependent on the mode and the scale of each of the 6 filter banks.

For the filter configuration, refer to Figure 148 through Figure 151.

Figure 148. 32-bit filter bank configuration (FSCx bits = 0b11 in CAN_FCRx register)

Figure 149. 16-bit filter bank configuration (FSCx bits = 0b10 in CAN_FCRx register)

Filter registers

Filter mode1

Mapping

STID[10:3] /

EXID[28:21]

STID [2:0] /

EXID[20:18]

EXID

[17:15]

EXID [14:7]

EXID[6:0]

FMHx = 0

FMLx = 0

FMHx = 1

FMLx = 1

Identifier

CAN_FxR1

CAN_FxR2

CAN_FxR3

CAN_FxR4

Identifier/Mask

CAN_FxR5

CAN_FxR6

CAN_FxR7

CAN_FxR8

n+1

ID= Identifier

M = Mask

n = Filter number

x = Filter bank number

1 The FMHx and FMLx bits are located in the CAN_FMR1 and CAN_FMR2 registers

Filter registers

Filter mode1

Mapping

STID[10:3] /

EXID[28:21]

STID [2:0]

/ EXID

[20:18]

EXID

[17:15]

FMHx = 0

FMLx = 0

FMHx = 0

FMLx = 1

FMHx = 1

FMLx = 0

FMHx = 1

FMLx = 1

Identifier

CAN_FxR1

CAN_FxR2

nID

Identifier/Mask

CAN_FxR3

CAN_FxR4

n+1

Identifier

CAN_FxR5

CAN_FxR6

n+1

n+2

n+1

n+2

Identifier/Mask

CAN_FxR7

CAN_FxR8

n+2

n+3

ID= Identifier

M = Mask

n = Filter number

x = Filter bank number

1 The FMHx and FMLx bits are located in the CAN_FMR1 and CAN_FMR2 registers

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