PIC18CXX2_13 Datasheet, PDF (156/304 Pages) Microchip Technology – High Performance Microcontrollers with 10-bit A/D

PIC18CXX2
FIGURE 15-2:
Write to TXREG
BRG Output
(shift clock)
RC6/TX/CK (pin)
TXIF bit
(Transmit buffer
reg. empty flag)
ASYNCHRONOUS TRANSMISSION
Word 1
START Bit
Bit 0
Bit 1
Word 1
TRMT bit
(Transmit shift
reg. empty flag)
Word 1
Transmit Shift Reg
Bit 7/8 _{STOP Bit}
FIGURE 15-3:
Write to TXREG
BRG Output
(shift clock)
RC6/TX/CK (pin)
TXIF bit
(interrupt reg. flag)
ASYNCHRONOUS TRANSMISSION (BACK TO BACK)
Word 1
Word 2
START Bit _{Bit 0}
Bit 1
Word 1
Bit 7/8
STOP Bit ^{START Bit}
Bit 0
Word 2
TRMT bit
(Transmit shift
reg. empty flag)
Word 1
Transmit Shift Reg.
Note: This timing diagram shows two consecutive transmissions.
Word 2
Transmit Shift Reg.
TABLE 15-6: REGISTERS ASSOCIATED WITH ASYNCHRONOUS TRANSMISSION
Name
Bit 7
Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1
Bit 0
Value on
POR,
BOR
Value on
all other
RESETS
INTCON
PIR1
PIE1
IPR1
GIE/GIEH
PSPIF⁽¹⁾
PSPIE⁽¹⁾
PSPIP⁽¹⁾
PEIE/
GIEL
ADIF
ADIE
ADIP
TMR0IE INT0IE
RCIF
RCIE
RCIP
TXIF
TXIE
TXIP
RBIE
SSPIF
SSPIE
SSPIP
TMR0IF INT0IF
CCP1IF TMR2IF
CCP1IE TMR2IE
CCP1IP TMR2IP
RBIF
TMR1IF
TMR1IE
TMR1IP
0000 000x 0000 000u
0000 0000 0000 0000
0000 0000 0000 0000
0000 0000 0000 0000
RCSTA
SPEN RX9 SREN CREN ADDEN FERR OERR RX9D 0000 -00x 0000 -00x
TXREG USART Transmit Register
0000 0000 0000 0000
TXSTA
CSRC TX9 TXEN SYNC — BRGH TRMT TX9D 0000 -010 0000 -010
SPBRG Baud Rate Generator Register
0000 0000 0000 0000
Legend: x = unknown, - = unimplemented locations read as '0'.
Shaded cells are not used for Asynchronous Transmission.
Note 1: The PSPIF, PSPIE and PSPIP bits are reserved on the PIC18C2X2 devices. Always maintain these bits
clear.
DS39026D-page 156
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