PIC18F4539-I/ML【PDF 230/322 页】IC MCU FLASH 12KX16 EE A/D 44QFN

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Sheet目录3882

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2009 Microchip Technology Inc.

DS39761C-page 305

PIC18F2682/2685/4682/4685

23.2.3.2

Message Acceptance Filters

and Masks

This section describes the message acceptance filters

and masks for the CAN receive buffers.

REGISTER 23-37: RXFnSIDH: RECEIVE ACCEPTANCE FILTER n STANDARD IDENTIFIER FILTER

REGISTERS, HIGH BYTE [0

≤ n ≤ 15](1)

R/W-x

SID10

SID9

SID8

SID7

SID6

SID5

SID4

SID3

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7-0

SID10:SID3: Standard Identifier Filter bits (if EXIDEN = 0)

Extended Identifier Filter bits EID28:EID21 (if EXIDEN = 1).

Note 1:

Registers RXF6SIDH:RXF15SIDH are available in Mode 1 and 2 only.

REGISTER 23-38: RXFnSIDL: RECEIVE ACCEPTANCE FILTER n STANDARD IDENTIFIER FILTER

REGISTERS, LOW BYTE [0

≤ n ≤ 15](1)

R/W-x

U-0

R/W-x

U-0

R/W-x

SID2

SID1

SID0

—

EXIDEN(2)

—EID17

EID16

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7-5

SID2:SID0: Standard Identifier Filter bits (if EXIDEN = 0)

Extended Identifier Filter bits EID20:EID18 (if EXIDEN = 1).

bit 4

Unimplemented: Read as ‘0’

bit 3

EXIDEN: Extended Identifier Filter Enable bit(2)

1 = Filter will only accept extended ID messages

0 = Filter will only accept standard ID messages

bit 2

Unimplemented: Read as ‘0’

bit 1-0

EID17:EID16: Extended Identifier Filter bits

Note 1:

Registers RXF6SIDL:RXF15SIDL are available in Mode 1 and 2 only.

In Mode 0, this bit must be set/cleared as required, irrespective of corresponding mask register value.

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