PIC16LF18854 Datasheet, PDF (567/668 Pages) Microchip Technology – C Compiler Optimized RISC Architecture

PIC16(L)F18856/76
33.3.5 RECEIVING A BREAK CHARACTER
The Enhanced EUSART module can receive a Break
character in two ways.
The first method to detect a Break character uses the
FERR bit of the RC1STA register and the received data
as indicated by RCREG. The Baud Rate Generator is
assumed to have been initialized to the expected baud
rate.
A Break character has been received when:
• RCIF bit is set
• FERR bit is set
• RCREG = 00h
The second method uses the Auto-Wake-up feature
described in Section 33.3.3 “Auto-Wake-up on
Break”. By enabling this feature, the EUSART will
sample the next two transitions on RX/DT, cause an
RCIF interrupt, and receive the next data byte followed
by another interrupt.
Note that following a Break character, the user will
typically want to enable the Auto-Baud Detect feature.
For both methods, the user can set the ABDEN bit of
the BAUD1CON register before placing the EUSART in
Sleep mode.
FIGURE 33-9:
SEND BREAK CHARACTER SEQUENCE
Write to TXREG
BRG Output
(Shift Clock)
TX (pin)
TXIF bit
(Transmit
Interrupt Flag)
TRMT bit
(Transmit Shift
Empty Flag)
SENDB
(send Break
control bit)
Dummy Write
Start bit
bit 0
bit 1
Break
SENDB Sampled Here
bit 11 _{Stop bit}
Auto Cleared
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Preliminary
DS40001824A-page 567