PIC18F23K20 Datasheet, PDF (233/420 Pages) Microchip Technology – 28/40/44-Pin Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

PIC18F2XK20/4XK20
FIGURE 18-4:
Write to TXREG
BRG Output
(Shift Clock)
RC4/C2OUT/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 18-1: 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
GIE/GIEH PEIE/GIEL TMR0IE INT0IE RBIE TMR0IF INT0IF RBIF
57
PSPIF⁽¹⁾ ADIF
RCIF
TXIF
SSPIF CCP1IF TMR2IF TMR1IF
60
PSPIE⁽¹⁾ ADIE
RCIE
TXIE SSPIE CCP1IE TMR2IE TMR1IE 60
PSPIP⁽¹⁾ ADIP
RCIP
TXIP SSPIP CCP1IP TMR2IP TMR1IP 60
RCSTA
SPEN
RX9
SREN CREN ADDEN FERR OERR RX9D
59
TXREG
EUSART Transmit Register
59
TXSTA
CSRC
TX9
TXEN SYNC SENDB BRGH TRMT TX9D
59
BAUDCTL ABDOVF RCIDL DTRXP CKTXP BRG16
—
WUE ABDEN
59
SPBRGH EUSART Baud Rate Generator Register, High Byte
59
SPBRG
EUSART Baud Rate Generator Register, Low Byte
59
Legend: — = unimplemented locations read as ‘0’. Shaded cells are not used for asynchronous transmission.
Note 1: Reserved in PIC18F2XK20 devices; always maintain these bits clear.
© 2007 Microchip Technology Inc.
Advance Information
DS41303B-page 231