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PIC18F4520E/MLQTP Datasheet(PDF) 214 Page - Microchip Technology

Part # PIC18F4520E/MLQTP
Description  28/40/44-Pin Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology
PDF  390 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC18F4520E/MLQTP Datasheet(HTML) 214 Page - Microchip Technology

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PIC18F2420/2520/4420/4520
DS39631A-page 212
Preliminary
 2004 Microchip Technology Inc.
FIGURE 18-4:
ASYNCHRONOUS TRANSMISSION
FIGURE 18-5:
ASYNCHRONOUS TRANSMISSION (BACK TO BACK)
TABLE 18-5:
REGISTERS ASSOCIATED WITH ASYNCHRONOUS TRANSMISSION
Word 1
Word 1
Transmit Shift Reg
Start bit
bit 0
bit 1
bit 7/8
Write to TXREG
BRG Output
(Shift Clock)
TX (pin)
TXIF bit
(Transmit Buffer
Reg. Empty Flag)
TRMT bit
(Transmit Shift
Reg. Empty Flag)
1 TCY
Stop bit
Word 1
Transmit Shift Reg.
Write to TXREG
BRG Output
(Shift Clock)
TX (pin)
TXIF bit
(Interrupt Reg. Flag)
TRMT bit
(Transmit Shift
Reg. Empty Flag)
Word 1
Word 2
Word 1
Word 2
Stop bit
Start bit
Transmit Shift Reg.
Word 1
Word 2
bit 0
bit 1
bit 7/8
bit 0
Note: This timing diagram shows two consecutive transmissions.
1 TCY
1 TCY
Start bit
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
49
PIR1
PSPIF(1)
ADIF
RCIF
TXIF
SSPIF
CCP1IF
TMR2IF
TMR1IF
52
PIE1
PSPIE(1)
ADIE
RCIE
TXIE
SSPIE
CCP1IE
TMR2IE
TMR1IE
52
IPR1
PSPIP(1)
ADIP
RCIP
TXIP
SSPIP
CCP1IP
TMR2IP
TMR1IP
52
RCSTA
SPEN
RX9
SREN
CREN
ADDEN
FERR
OERR
RX9D
51
TXREG
EUSART Transmit Register
51
TXSTA
CSRC
TX9
TXEN
SYNC
SENDB
BRGH
TRMT
TX9D
51
BAUDCON
ABDOVF
RCIDL
—
SCKP
BRG16
—
WUE
ABDEN
51
SPBRGH
EUSART Baud Rate Generator Register, High Byte
51
SPBRG
EUSART Baud Rate Generator Register, Low Byte
51
Legend: — = unimplemented locations read as ‘0’. Shaded cells are not used for asynchronous transmission.
Note 1:
Reserved in 28-pin devices; always maintain these bits clear.



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