PIC18F2331 MICROCHIP [Microchip Technology], PIC18F2331 Datasheet - Page 233

• Manufacturer Part Number: PIC18F2331
• Description: 28/40/44-Pin Enhanced Flash Microcontrollers with nanoWatt Technology, High Performance PWM and A/D
• Manufacturer: MICROCHIP [Microchip Technology]

FIGURE 19-2:
FIGURE 19-3:
FIGURE 19-4:
 2003 Microchip Technology Inc.
(Interrupt Reg. Flag)
Reg. Empty Flag)
Reg. Empty Flag)
Note:
Reg. Empty Flag)
Write to TXREG
(Transmit Buffer
RC6/TX/CK/SS
Write to TXREG
(Transmit Shift
RC6/TX/CK/SS
(Transmit Shift
BRG Output
(Shift Clock)
BRG Output
(Shift Clock)
BRG16
TRMT bit
TRMT bit
TXIF bit
TXIF bit
This timing diagram shows two consecutive transmissions.
TXIE
(pin)
(pin)
Interrupt
SPBRGH
Baud Rate Generator
TXEN
TXIF
USART TRANSMIT BLOCK DIAGRAM
ASYNCHRONOUS TRANSMISSION
ASYNCHRONOUS TRANSMISSION (BACK TO BACK)
1 T
Word 1
Transmit Shift Reg
CY
Word 1
Transmit Shift Reg.
Word 1
Word 1
Baud Rate CLK
SPBRG
1 T
CY
Start bit
Start bit
Word 2
MSb
(8)
PIC18F2331/2431/4331/4431
1 T
TX9D
CY
TXREG Register
bit 0
bit 0
TSR Register
TX9
Preliminary
8
Data Bus
bit 1
Word 1
bit 1
Word 1
LSb
0
TRMT
bit 7/8
Pin Buffer
and Control
bit 7/8
SPEN
Word 2
Transmit Shift Reg.
Stop bit
Stop bit
RC6/TX/CK/SS pin
Start bit
DS39616B-page 231
Word 2
bit 0