PIC18C242 MICROCHIP [Microchip Technology], PIC18C242 Datasheet - Page 158

• Manufacturer Part Number: PIC18C242
• Description: High-Performance Microcontrollers with 10-Bit A/D
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18CXX2
FIGURE 15-2: ASYNCHRONOUS TRANSMISSION
FIGURE 15-3: ASYNCHRONOUS TRANSMISSION (BACK TO BACK)
TABLE 15-6:
DS39026B-page 158
Name
INTCON
PIR1
PIE1
IPR1
RCSTA
TXREG
TXSTA
SPBRG
Legend: x = unknown, - = unimplemented locations read as '0'.
Note 1: The PSPIF, PSPIE and PSPIP bits are reserved on the PIC18C2X2 devices. Always maintain these bits
TXIF bit
(interrupt reg. flag)
RC6/TX/CK (pin)
RC6/TX/CK (pin)
TRMT bit
(Transmit shift
reg. empty flag)
Write to TXREG
Write to TXREG
TXIF bit
(Transmit buffer
reg. empty flag)
TRMT bit
(Transmit shift
reg. empty flag)
BRG output
(shift clock)
BRG output
(shift clock)
clear.
Shaded cells are not used for Asynchronous Transmission.
USART Transmit Register
Baud Rate Generator Register
GIE/GIEH
PSPIE
PSPIP
PSPIF
CSRC
SPEN
Bit 7
REGISTERS ASSOCIATED WITH ASYNCHRONOUS TRANSMISSION
(1)
(1)
(1)
Note: This timing diagram shows two consecutive transmissions.
PEIE/
GIEL
ADIF
ADIE
ADIP
Bit 6
RX9
Transmit Shift Reg.
TX9
WORD 1
Transmit Shift Reg
WORD 1
Word 1
Word 1
TMR0IE INT0IE RBIE TMR0IF
SREN
TXEN
RCIE
RCIP
RCIF
Bit 5
Start Bit
Start Bit
Word 2
CREN
SYNC
Bit 4
TXIF
TXIE
TXIP
Bit 0
Bit 0
Preliminary
SSPIE CCP1IE TMR2IE TMR1IE 0000 0000 0000 0000
SSPIP CCP1IP TMR2IP TMR1IP 0000 0000 0000 0000
SSPIF CCP1IF TMR2IF TMR1IF 0000 0000 0000 0000
Bit 3
—
—
Bit 1
WORD 1
BRGH
FERR
Bit 2
Bit 1
WORD 1
INT0IF
OERR
TRMT
Bit 1
Bit 7/8
RX9D
TX9D
WORD 2
Transmit Shift Reg.
RBIF
Bit 0
Bit 7/8
Stop Bit
7/99 Microchip Technology Inc.
0000 000x 0000 000u
0000 -00x 0000 -00x
0000 0000 0000 0000
0000 -010 0000 -010
0000 0000 0000 0000
Value on
Stop Bit
POR,
BOR
Start Bit
WORD 2
Value on
all other
Resets
Bit 0