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 24-21: RXERRCNT: RECEIVE ERROR COUNT REGISTER

R-0

REC7

bit 7

R-0

REC6

R-0

REC5

R-0

REC4

R-0

REC3

R-0

REC2

R-0

REC1

R-0

REC0

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

REC<7:0>: Receive Error Counter bits

This register contains the receive error value as defined by the CAN specifications. When

RXERRCNT > 127, the module will go into an error-passive state. RXERRCNT does not have the

ability to put the module in “bus-off” state.

EXAMPLE 24-5: READING A CAN MESSAGE

; Need to read a pending message from RXB0 buffer.

; To receive any message, filter, mask and RXM1:RXM0 bits in RXB0CON registers must be

; programmed correctly.

;

; Make sure that there is a message pending in RXB0.

BTFSS RXB0CON, RXFUL

; Does RXB0 contain a message?

BRA

NoMessage

; No. Handle this situation...

; We have verified that a message is pending in RXB0 buffer.

; If this buffer can receive both Standard or Extended Identifier messages,

; identify type of message received.

BTFSS RXB0SIDL, EXID

; Is this Extended Identifier?

BRA

StandardMessage

; No. This is Standard Identifier message.

; Yes. This is Extended Identifier message.

; Read all 29-bits of Extended Identifier message.

...

; Now read all data bytes

MOVFF RXB0DO, MY_DATA_BYTE1

...

; Once entire message is read, mark the RXB0 that it is read and no longer FULL.

BCF

RXB0CON, RXFUL

; This will allow CAN Module to load new messages

; into this buffer.

...

© 2009 Microchip Technology Inc.

DS39637D-page 299

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