PIC18F25K80 MICROCHIP [Microchip Technology], PIC18F25K80 Datasheet - Page 416
PIC18F25K80
Manufacturer Part Number
PIC18F25K80
Description
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18F25K80.pdf
(628 pages)
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PIC18F66K80 FAMILY
REGISTER 27-21: RXERRCNT: RECEIVE ERROR COUNT REGISTER
EXAMPLE 27-5:
DS39977C-page 416
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 7-0
REC7
; 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
BRA
; 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
BRA
; Read all 29-bits of Extended Identifier message.
...
; Now read all data bytes
MOVFF
...
; Once entire message is read, mark the RXB0 that it is read and no longer FULL.
BCF
...
R-0
RXB0CON, RXFUL
NoMessage
RXB0SIDL, EXID
StandardMessage
RXB0DO, MY_DATA_BYTE1
RXB0CON, RXFUL
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.
REC6
R-0
READING A CAN MESSAGE
W = Writable bit
‘1’ = Bit is set
REC5
R-0
REC4
R-0
Preliminary
; Does RXB0 contain a message?
; No. Handle this situation...
; Is this Extended Identifier?
; No. This is Standard Identifier message.
; Yes. This is Extended Identifier message.
; This will allow CAN Module to load new messages
; into this buffer.
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
REC3
R-0
REC2
R-0
2011 Microchip Technology Inc.
x = Bit is unknown
REC1
R-0
REC0
R-0
bit 0
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