PIC18F25K20T-ISO Datasheet, PDF (238/456 Pages) Microchip Technology – 28/40/44-Pin Flash Microcontrollers with nanoWatt XLP Technology

PIC18F2XK20/4XK20
FIGURE 18-2:
EUSART RECEIVE BLOCK DIAGRAM
CREN
OERR
RCIDL
RX/DT pin
Pin Buffer
and Control
Data
Recovery
Baud Rate Generator
BRG16
+1
SPBRGH SPBRG
FOSC
÷n
Multiplier x4 x16 x64 ⁿ
SYNC 1 X 0 0 0
BRGH X 1 1 0 0
BRG16 X 1 0 1 0
The operation of the EUSART module is controlled
through three registers:
• Transmit Status and Control (TXSTA)
• Receive Status and Control (RCSTA)
• Baud Rate Control (BAUDCON)
These registers are detailed in Register 18-1,
Register 18-2 and Register 18-3, respectively.
For all modes of EUSART operation, the TRIS control
bits corresponding to the RX/DT and TX/CK 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 RX or TX pin may be used for
general purpose input and output.
MSb
Stop (8)
RSR Register
7 ••• 1
LSb
0 START
RX9
FERR
RX9D
RCREG Register
FIFO
8
Data Bus
RCIF
RCIE
Interrupt
DS41303G-page 238
 2010 Microchip Technology Inc.