PIC18F-LF1XK50 Datasheet, PDF (185/420 Pages) Microchip Technology – 20-Pin USB Flash Microcontrollers

PIC18F/LF1XK50
FIGURE 16-3:
ASYNCHRONOUS TRANSMISSION
Write to TXREG
BRG Output
(Shift Clock)
RB7/TX/CK
pin
TXIF bit
(Transmit Buffer
Reg. Empty Flag)
Word 1
Start bit
bit 0
1 TCY
bit 1
Word 1
TRMT bit
(Transmit Shift
Reg. Empty Flag)
Word 1
Transmit Shift Reg
bit 7/8 _{Stop bit}
FIGURE 16-4:
Write to TXREG
BRG Output
(Shift Clock)
RB7/TX/CK
pin
TXIF bit
(Interrupt Reg. Flag)
TRMT bit
(Transmit Shift
Reg. Empty Flag)
ASYNCHRONOUS TRANSMISSION (BACK-TO-BACK)
Word 1
Word 2
1 TCY
Start bit
Word 1
Transmit Shift Reg
bit 0
1 TCY
bit 1
Word 1
bit 7/8 _{Stop bit}
Start bit
bit 0
Word 2
Word 2
Transmit Shift Reg
Note:
This timing diagram shows two consecutive transmissions.
TABLE 16-1: REGISTERS ASSOCIATED WITH ASYNCHRONOUS TRANSMISSION
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Reset
Values
on page
INTCON
PIR1
PIE1
IPR1
RCSTA
TXREG
TXSTA
GIE/GIEH PEIE/GIEL TMR0IE INT0IE RABIE TMR0IF INT0IF RABIF 285
—
ADIF
RCIF
TXIF
SSPIF CCP1IF TMR2IF TMR1IF 288
—
ADIE
RCIE
TXIE SSPIE CCP1IE TMR2IE TMR1IE 288
—
ADIP
RCIP
TXIP SSPIP CCP1IP TMR2IP TMR1IP 288
SPEN
RX9
SREN CREN ADDEN FERR OERR RX9D
287
EUSART Transmit Register
287
CSRC
TX9
TXEN SYNC SENDB BRGH TRMT TX9D
287
BAUDCON ABDOVF RCIDL DTRXP CKTXP BRG16
—
WUE ABDEN 287
SPBRGH EUSART Baud Rate Generator Register, High Byte
287
SPBRG
EUSART Baud Rate Generator Register, Low Byte
287
Legend: — = unimplemented locations read as ‘0’. Shaded cells are not used for asynchronous transmission.
 2010 Microchip Technology Inc.
Preliminary
DS41350E-page 185