PIC18F2480/2580/4480/4580
REGISTER 24-4: COMSTAT: COMMUNICATION STATUS REGISTER
R/C-0
R/C-0
R-0
R-0
R-0
R-0
R-0
R-0
Mode 0
Mode 1
Mode 2
RXB0OVFL RXB1OVFL
TXBO
TXBP
RXBP
TXWARN
RXWARN
EWARN
R/C-0
—
R/C-0
R-0
R-0
R-0
R-0
R-0
R-0
RXBnOVFL
TXB0
TXBP
RXBP
TXWARN
RXWARN
EWARN
R/C-0
R/C-0
R-0
R-0
R-0
R-0
R-0
R-0
FIFOEMPTY RXBnOVFL
bit 7
TXBO
TXBP
RXBP
TXWARN
RXWARN
EWARN
bit 0
Legend:
C = Clearable bit
W = Writable bit
‘1’ = Bit is set
R = Readable bit
-n = Value at POR
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared x = Bit is unknown
bit 7
Mode 0:
RXB0OVFL: Receive Buffer 0 Overflow bit
1= Receive Buffer 0 overflowed
0= Receive Buffer 0 has not overflowed
Mode 1:
Unimplemented: Read as ‘0’
Mode 2:
FIFOEMPTY: FIFO Not Empty bit
1= Receive FIFO is not empty
0= Receive FIFO is empty
bit 6
Mode 0:
RXB1OVFL: Receive Buffer 1 Overflow bit
1= Receive Buffer 1 overflowed
0= Receive Buffer 1 has not overflowed
Mode 1, 2:
RXBnOVFL: Receive Buffer n Overflow bit
1= Receive Buffer n has overflowed
0= Receive Buffer n has not overflowed
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
TXBO: Transmitter Bus-Off bit
1= Transmit error counter > 255
0= Transmit error counter ≤ 255
TXBP: Transmitter Bus Passive bit
1= Transmit error counter > 127
0= Transmit error counter ≤ 127
RXBP: Receiver Bus Passive bit
1= Receive error counter > 127
0= Receive error counter ≤ 127
TXWARN: Transmitter Warning bit
1= Transmit error counter > 95
0= Transmit error counter ≤ 95
RXWARN: Receiver Warning bit
1= 127 ≥ Receive error counter > 95
0= Receive error counter ≤ 95
EWARN: Error Warning bit
This bit is a flag of the RXWARN and TXWARN bits.
1= The RXWARN or the TXWARN bits are set
0= Neither the RXWARN or the TXWARN bits are set
© 2009 Microchip Technology Inc.
DS39637D-page 287
MICROCHIP [ MICROCHIP ]
