PIC18F2420/2520/4420/4520
REGISTER 18-3: BAUDCON: BAUD RATE CONTROL REGISTER
R/W-0
R-1
R/W-0
R/W-0
R/W-0
U-0
—
R/W-0
WUE
R/W-0
ABDOVF
RCIDL
RXDTP
TXCKP
BRG16
ABDEN
bit 7
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
bit 6
bit 5
ABDOVF: Auto-Baud Acquisition Rollover Status bit
1= A BRG rollover has occurred during Auto-Baud Rate Detect mode (must be cleared in software)
0= No BRG rollover has occurred
RCIDL: Receive Operation Idle Status bit
1= Receive operation is Idle
0= Receive operation is active
RXDTP: Data/Receive Polarity Select bit
Asynchronous mode:
1= Receive data (RX) is inverted (active-low)
0= Receive data (RX) is not inverted (active-high)
Synchronous mode:
1= Data (DT) is inverted (active-low)
0= Data (DT) is not inverted (active-high)
bit 4
TXCKP: Clock and Data Polarity Select bit
Asynchronous mode:
1= Idle state for transmit (TX) is a low level
0= Idle state for transmit (TX) is a high level
Synchronous mode:
1= Idle state for clock (CK) is a high level
0= Idle state for clock (CK) is a low level
bit 3
BRG16: 16-Bit Baud Rate Register Enable bit
1= 16-bit Baud Rate Generator – SPBRGH and SPBRG
0= 8-bit Baud Rate Generator – SPBRG only (Compatible mode), SPBRGH value ignored
bit 2
bit 1
Unimplemented: Read as ‘0’
WUE: Wake-up Enable bit
Asynchronous mode:
1= EUSART will continue to sample the RX pin – interrupt generated on falling edge; bit cleared in
hardware on following rising edge
0= RX pin not monitored or rising edge detected
Synchronous mode:
Unused in this mode.
bit 0
ABDEN: Auto-Baud Detect Enable bit
Asynchronous mode:
1= Enable baud rate measurement on the next character. Requires reception of a Sync field (55h);
cleared in hardware upon completion.
0= Baud rate measurement disabled or completed
Synchronous mode:
Unused in this mode.
DS39631E-page 204
© 2008 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
