PIC18F4580ISOSQTP 查看數據表（PDF） - Microchip Technology

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PIC18F4580ISOSQTP

28/40/44-Pin Enhanced Flash Microcontrollers with ECAN™ Technology, 10-Bit A/D and nanoWatt Technology

Microchip Technology 

PIC18F2480/2580/4480/4580

REGISTER 24-14: RXB1CON: RECEIVE BUFFER 1 CONTROL REGISTER (CONTINUED)

bit 2-0

Mode 0:

FILHIT<2:0>: Filter Hit bits

These bits indicate which acceptance filter enabled the last message reception into Receive Buffer 1.

111 = Reserved

110 = Reserved

101 = Acceptance Filter 5 (RXF5)

100 = Acceptance Filter 4 (RXF4)

011 = Acceptance Filter 3 (RXF3)

010 = Acceptance Filter 2 (RXF2)

001 = Acceptance Filter 1 (RXF1), only possible when RXB0DBEN bit is set

000 = Acceptance Filter 0 (RXF0), only possible when RXB0DBEN bit is set

Mode 1, 2:

FILHIT<2:0> Filter Hit bits <2:0>

These bits, in combination with FILHIT<4:3>, indicate which acceptance filter enabled the message

reception into this receive buffer.

01111 = Acceptance Filter 15 (RXF15)

01110 = Acceptance Filter 14 (RXF14)

...

00000 = Acceptance Filter 0 (RXF0)

Note 1: This bit is set by the CAN module upon receiving a message and must be cleared by software after the

buffer is read. As long as RXFUL is set, no new message will be loaded and buffer will be considered full.

REGISTER 24-15: RXBnSIDH: RECEIVE BUFFER n STANDARD IDENTIFIER REGISTERS,

HIGH BYTE [0 ≤ n ≤ 1]

R-x

SID10

bit 7

R-x

SID9

R-x

SID8

R-x

SID7

R-x

SID6

R-x

SID5

R-x

SID4

R-x

SID3

bit 0

Legend:

R = Readable bit

-n = Value at POR

W = Writable bit

‘1’ = Bit is set

U = Unimplemented bit, read as ‘0’

‘0’ = Bit is cleared

x = Bit is unknown

bit 7-0

SID<10:3>: Standard Identifier bits (if EXID (RXBnSIDL<3>) = 0)

Extended Identifier bits, EID<28:21> (if EXID = 1).

DS39637D-page 296

© 2009 Microchip Technology Inc.

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