PIC18F2420 MICROCHIP [Microchip Technology], PIC18F2420 Datasheet - Page 214

• Manufacturer Part Number: PIC18F2420
• Description: 28/40/44-Pin Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18F2420/2520/4420/4520
FIGURE 18-4:
FIGURE 18-5:
TABLE 18-5:
DS39631A-page 212
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 1:
Note: This timing diagram shows two consecutive transmissions.
(Interrupt Reg. Flag)
Reg. Empty Flag)
Reg. Empty Flag)
Write to TXREG
(Transmit Buffer
Reg. Empty Flag)
Name
(Transmit Shift
Write to TXREG
(Transmit Shift
BRG Output
(Shift Clock)
BRG Output
(Shift Clock)
TRMT bit
TX (pin)
TXIF bit
TRMT bit
Reserved in 28-pin devices; always maintain these bits clear.
TX (pin)
TXIF bit
EUSART Transmit Register
EUSART Baud Rate Generator Register, High Byte
EUSART Baud Rate Generator Register, Low Byte
GIE/GIEH PEIE/GIEL TMR0IE
ABDOVF
PSPIF
PSPIE
PSPIP
CSRC
SPEN
Bit 7
REGISTERS ASSOCIATED WITH ASYNCHRONOUS TRANSMISSION
1 T
(1)
(1)
(1)
ASYNCHRONOUS TRANSMISSION
ASYNCHRONOUS TRANSMISSION (BACK TO BACK)
CY
Word 1
Transmit Shift Reg
Transmit Shift Reg.
Word 1
Word 1
Word 1
RCIDL
ADIF
ADIE
ADIP
Bit 6
RX9
TX9
1 T
CY
Start bit
Start bit
Word 2
SREN
TXEN
RCIE
RCIP
RCIF
Bit 5
—
1 T
CY
bit 0
bit 0
Preliminary
INT0IE
CREN
SYNC
SCKP
Bit 4
TXIF
TXIE
TXIP
bit 1
Word 1
bit 1
Word 1
ADDEN
SENDB
BRG16
SSPIF
SSPIE
SSPIP
RBIE
Bit 3
TMR0IF
CCP1IE
CCP1IP
CCP1IF
BRGH
FERR
Bit 2
—
bit 7/8
bit 7/8
Word 2
Transmit Shift Reg.
TMR2IE
TMR2IP
TMR2IF
Stop bit
INT0IF
OERR
TRMT
 2004 Microchip Technology Inc.
WUE
Bit 1
Stop bit
Start bit
TMR1IF
TMR1IE
TMR1IP
ABDEN
RX9D
TX9D
RBIF
Bit 0
Word 2
on page
Values
bit 0
Reset
49
52
52
52
51
51
51
51
51
51