PIC18F6390 Datasheet, PDF (225/412 Pages) Microchip Technology – 64/80-Pin Flash Microcontrollers with LCD Driver and nanoWatt Technology

PIC18F6390/6490/8390/8490
FIGURE 17-2:
Write to TXREG2
BRG Output
(Shift Clock)
TX2 (pin)
TX2IF 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 17-3:
ASYNCHRONOUS TRANSMISSION (BACK TO BACK)
Write to TXREG2
BRG Output
(Shift Clock)
Word 1
Word 2
TX2 (pin)
TX2IF 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 17-4: 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
PIR3
—
LCDIF RC2IF TX2IF
—
—
—
—
61
PIE3
—
LCDIE RC2IE TX2IE
—
—
—
—
61
IPR3
—
LCDIP RC2IP TX2IP
—
—
—
—
61
RCSTA2
SPEN
RX9
SREN CREN ADDEN FERR OERR RX9D
63
TXREG2 AUSART2 Transmit Register
63
TXSTA2
CSRC
TX9
TXEN SYNC
—
BRGH TRMT TX9D
63
SPBRG2 AUSART2 Baud Rate Generator Register
63
Legend: — = unimplemented locations read as ‘0’. Shaded cells are not used for asynchronous transmission.
 2004 Microchip Technology Inc.
Preliminary
DS39629B-page 223