PIC18F2450 MICROCHIP [Microchip Technology], PIC18F2450 Datasheet - Page 165

• Manufacturer Part Number: PIC18F2450
• Description: 28/40/44-Pin, High-Performance, 12 MIPS, Enhanced Flash, USB Microcontrollers with nanoWatt Technology
• Manufacturer: MICROCHIP [Microchip Technology]

FIGURE 15-4:
FIGURE 15-5:
TABLE 15-5:
© 2006 Microchip Technology Inc.
INTCON
PIR1
PIE1
IPR1
RCSTA
TXREG
TXSTA
BAUDCON
SPBRGH
SPBRG
Legend: — = unimplemented locations read as ‘0’. Shaded cells are not used for asynchronous transmission.
Note:
(Interrupt Reg. Flag)
Reg. Empty Flag)
Reg. Empty Flag)
Write to TXREG
(Transmit Buffer
Name
Reg. Empty Flag)
(Transmit Shift
Write to TXREG
(Transmit Shift
BRG Output
(Shift Clock)
BRG Output
(Shift Clock)
TRMT bit
This timing diagram shows two consecutive transmissions.
TXIF bit
TRMT bit
TXIF bit
(pin)
TX
(pin)
EUSART Transmit Register
EUSART Baud Rate Generator Register High Byte
EUSART Baud Rate Generator Register Low Byte
GIE/GIEH PEIE/GIEL TMR0IE
ABDOVF
TX
SPEN
CSRC
Bit 7
REGISTERS ASSOCIATED WITH ASYNCHRONOUS TRANSMISSION
—
—
—
1 T
ASYNCHRONOUS TRANSMISSION
ASYNCHRONOUS TRANSMISSION (BACK TO BACK)
CY
Transmit Shift Reg.
Word 1
Transmit Shift Reg
Word 1
Word 1
Word 1
RCIDL
ADIE
ADIP
ADIF
Bit 6
RX9
TX9
1 T
CY
Start bit
Start bit
Word 2
SREN
TXEN
RCIF
RCIE
RCIP
Bit 5
—
Advance Information
1 T
CY
bit 0
bit 0
INT0IE
CREN
SYNC
SCKP
Bit 4
TXIF
TXIE
TXIP
bit 1
Word 1
bit 1
Word 1
ADDEN
SENDB
BRG16
RBIE
Bit 3
—
—
—
PIC18F2450/4450
TMR0IF
CCP1IF
CCP1IE
CCP1IP
BRGH
FERR
Bit 2
—
bit 7/8
bit 7/8
Word 2
Transmit Shift Reg.
TMR2IF
TMR2IE
TMR2IP
INT0IF
OERR
Stop bit
TRMT
WUE
Bit 1
Stop bit
Start bit
TMR1IE
TMR1IP
TMR1IF
ABDEN
RX9D
DS39760A-page 163
TX9D
RBIF
Bit 0
Word 2
on page
bit 0
Values
Reset
49
51
51
51
51
50
51
51
50
50