Datasheet

PIC18F2XK20/4XK20
DS41303G-page 248  2010 Microchip Technology Inc.
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 R/W-0
ABDOVF RCIDL DTRXP CKTXP BRG16 — WUE ABDEN
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 7 ABDOVF: Auto-Baud Detect Overflow bit
Asynchronous mode
:
1 = Auto-baud timer overflowed
0 = Auto-baud timer did not overflow
Synchronous mode
:
Don’t care
bit 6 RCIDL: Receive Idle Flag bit
Asynchronous mode
:
1 = Receiver is Idle
0 = Start bit has been detected and the receiver is active
Synchronous mode
:
Don’t care
bit 5 DTRXP: 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 CKTXP: Clock/Transmit Polarity Select bit
Asynchronous mode
:
1 = Idle state for transmit (TX) is low
0 = Idle state for transmit (TX) is high
Synchronous mode
:
1 = Data changes on the falling edge of the clock and is sampled on the rising edge of the clock
0 = Data changes on the rising edge of the clock and is sampled on the falling edge of the clock
bit 3 BRG16: 16-bit Baud Rate Generator bit
1 = 16-bit Baud Rate Generator is used (SPBRGH:SPBRG)
0 = 8-bit Baud Rate Generator is used (SPBRG)
bit 2 Unimplemented: Read as ‘0’
bit 1 WUE: Wake-up Enable bit
Asynchronous mode
:
1 = Receiver is waiting for a falling edge. No character will be received but RCIF will be set on the falling
edge. WUE will automatically clear on the rising edge.
0 = Receiver is operating normally
Synchronous mode
:
Don’t care
bit 0 ABDEN: Auto-Baud Detect Enable bit
Asynchronous mode
:
1 = Auto-Baud Detect mode is enabled (clears when auto-baud is complete)
0 = Auto-Baud Detect mode is disabled
Synchronous mode
:
Don’t care