ST72561 datasheet(206/262 Pages) STMICROELECTRONICS

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ST72561

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beCAN CONTROLLER (Cont’d)

CAN FILTER MODE REGISTER (CFMR1)

All bits of this register are set and cleared by soft-

ware.

Read / Write

Reset Value: 0000 0000 (00h)

Bit 7:4 = Reserved. Forced to 0 by hardware.

Bit 3 = FMH5 Filter Mode High

Mode of the high registers of Filter 5.

0: High registers are in mask mode

1: High registers are in identifier list mode

Bit 2 = FML5 Filter Mode Low

Mode of the low registers of filter 5.

0: Low registers are in mask mode

1: Low registers are in identifier list mode

Bit 1 = FMH4 Filter Mode High

Mode of the high registers of filter 4.

0: High registers are in mask mode

1: High registers are in identifier list mode

Bit 0 = FML4 Filter Mode Low

Mode of the low registers of filter 4.

0: Low registers are in mask mode

1: Low registers are in identifier list mode

FILTER x REGISTER[7:0] (CFxR[7:0])

Read / Write

Reset Value: Undefined

In all configurations:

Bit 7:0 = FB[7:0] Filter Bits

Identifier

Each bit of the register specifies the level of the

corresponding bit of the expected identifier.

0: Dominant bit is expected

1: Recessive bit is expected

Mask

Each bit of the register specifies whether the bit of

the associated identifier register must match with

the corresponding bit of the expected identifier or

not.

0: Don’t care, the bit is not used for the comparison

1: Must match, the bit of the incoming identifier

must have the same level has specified in the

corresponding identifier register of the filter.

Note: Each filter x is composed of 8 registers,

CFxR[7:0]. Depending on the scale and mode

configuration of the filter the function of each reg-

ister can differ. For the filter mapping, functions

description and mask registers association, refer

to Section 10.9.4.3Identifier Filtering.

A Mask/Identifier register in mask mode has the

same bit mapping as in identifier list mode.

Note: To modify these registers, the correspond-

ing FACT bit in the CFCR register must be

cleared.

FMH5

FML5

FMH4

FML4

FB7

FB6

FB5

FB4

FB3

FB2

FB1

FB0

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