PIC18F248-E/L MICROCHIP [Microchip Technology], PIC18F248-E/L Datasheet - Page 233

• Manufacturer Part Number: PIC18F248-E/L
• Description: 28/40-Pin High-Performance, Enhanced Flash Microcontrollers with CAN Module
• Manufacturer: MICROCHIP [Microchip Technology]

FIGURE 19-5:
© 2006 Microchip Technology Inc.
Move Message into RXB0
according to which Filter
Criteria was met
Set RXRDY = 1
Set FILHIT <0>
RXFUL = 0?
RXIE = 1?
INTERNAL MESSAGE RECEPTION FLOWCHART
Is
Is
Yes
No
The RXFUL bit determines if the
receive register is empty and able
to accept a new message.
No
Yes
Generate Overrun Error:
Generate
Frame
Error
RX0DBEN = 1?
Set RXB0OVFL
Yes, meets criteria
for RXBO
Is
The RXB0DBEN bit determines if
RXB0 can rollover into RXB1 if it is
full.
Set CANSTAT <3:0> according
No
to which Receive Buffer the
Message Assembly Buffer (MAB)
Message was loaded into
No
Begin Loading Message into
No
ERRIE = 1?
Identifier meets a
Generate
Yes
Interrupt
Filter Criteria?
Yes
Received?
Message?
Go to Start
Message
Message
Is
Start of
Detect
Valid
Start
Yes
Yes
Generate Overrun Error:
No
Set RXB1OVFL
Go to Start
No
Yes, meets criteria
for RXB1
Yes
No
Move Message into RXB1
according to which Filter
PIC18FXX8
Set FILHIT <2:0>
Criteria was met
Set RXRDY = 1
RXFUL = 0?
Yes
RXIE = 1?
Is
Is
No
DS41159E-page 231