Datasheet

PIC18(L)F2X/4XK22
DS41412F-page 268  2010-2012 Microchip Technology Inc.
FIGURE 16-2: EUSART RECEIVE BLOCK DIAGRAM
The operation of the EUSART module is controlled
through three registers:
• Transmit Status and Control (TXSTAx)
• Receive Status and Control (RCSTAx)
• Baud Rate Control (BAUDCONx)
These registers are detailed in Register 16-1,
Register 16-2 and Register 16-3, respectively.
For all modes of EUSART operation, the TRIS control
bits corresponding to the RXx/DTx and TXx/CKx pins
should be set to ‘1’. The EUSART control will
automatically reconfigure the pin from input to output, as
needed.
When the receiver or transmitter section is not enabled
then the corresponding RXx/DTx or TXx/CKx pin may be
used for general purpose input and output.
RXx/DTx pin
Pin Buffer
and Control
Data
Recovery
CREN OERR
FERR
RSR Register
MSb
LSb
RX9D
RCREGx Register
FIFO
Interrupt
RCxIF
RCxIE
Data Bus
8
Stop
START
(8) 7 1 0
RX9
• • •
SPBRGxSPBRGHx
BRG16
RCIDL
FOSC
÷ n
n
+ 1
Multiplier x4 x16 x64
SYNC 1X00 0
BRGH X110 0
BRG16 X101 0
Baud Rate Generator