PIC18F6390 Datasheet, PDF (209/412 Pages) Microchip Technology – 64/80-Pin Flash Microcontrollers with LCD Driver and nanoWatt Technology

PIC18F6390/6490/8390/8490
FIGURE 16-4:
Write to TXREG1
BRG Output
(Shift Clock)
TX1 (pin)
TX1IF bit
(Transmit Buffer
Reg. Empty Flag)
TRMT bit
(Transmit Shift
Reg. Empty Flag)
ASYNCHRONOUS TRANSMISSION
Word 1
Start bit
bit 0
1 TCY
bit 1
Word 1
Word 1
Transmit Shift Reg
bit 7/8 _{Stop bit}
FIGURE 16-5:
ASYNCHRONOUS TRANSMISSION (BACK TO BACK)
Write to TXREG1
BRG Output
(Shift Clock)
Word 1
Word 2
TX1 (pin)
TX1IF bit
(Interrupt Reg. Flag)
TRMT bit
(Transmit Shift
Reg. Empty Flag)
1 TCY
Start bit
bit 0
Word 1
Transmit Shift Reg.
1 TCY
Note: This timing diagram shows two consecutive transmissions.
bit 1
Word 1
bit 7/8 Stop bit
Start bit
bit 0
Word 2
Word 2
Transmit Shift Reg.
TABLE 16-5: 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
GIE/GIEH PEIE/GIEL TMR0IE INT0IE RBIE TMR0IF INT0IF
RBIF
59
PIR1
—
ADIF
RC1IF TX1IF SSPIF CCP1IF TMR2IF TMR1IF
61
PIE1
—
ADIE RC1IE TX1IE SSPIE CCP1IE TMR2IE TMR1IE 61
IPR1
—
ADIP RC1IP TX1IP SSPIP CCP1IP TMR2IP TMR1IP 61
RCSTA1
SPEN
RX9
SREN CREN ADDEN FERR OERR RX9D
61
TXREG1 EUSART1 Transmit Register
61
TXSTA1
CSRC
TX9
TXEN SYNC SENDB BRGH TRMT TX9D
61
BAUDCON1 ABDOVF RCIDL
—
SCKP BRG16
—
WUE ABDEN 62
SPBRGH1 EUSART1 Baud Rate Generator Register High Byte
62
SPBRG1 EUSART1 Baud Rate Generator Register Low Byte
61
Legend: — = unimplemented locations read as ‘0’. Shaded cells are not used for asynchronous transmission.
 2004 Microchip Technology Inc.
Preliminary
DS39629B-page 207