PIC18F66K22-I Datasheet, PDF (338/550 Pages) Microchip Technology – PIC18F87K22 Family Data Sheet

PIC18F87K22 FAMILY
FIGURE 22-3:
EUSART TRANSMIT BLOCK DIAGRAM
TXxIE
TXxIF
MSb
(8)
Interrupt
TXEN Baud Rate CLK
BRG16
SPBRGHx SPBRGx
Baud Rate Generator
Data Bus
TXREGx Register
8

TSR Register
TX9
TX9D
LSb
0
Pin Buffer
and Control
TRMT
SPEN
TXx Pin
FIGURE 22-4:
Write to TXREGx
BRG Output
(Shift Clock)
TXx (pin)
TXxIF bit
(Transmit Buffer
Reg. Empty Flag)
TRMT bit
(Transmit Shift
Reg. Empty Flag)
ASYNCHRONOUS TRANSMISSION
Word 1
Start bit
bit 0
1 TCY
bit 1
Word 1
Word 1
Transmit Shift Reg
bit 7/8 Stop bit
FIGURE 22-5:
ASYNCHRONOUS TRANSMISSION (BACK-TO-BACK)
Write to TXREGx
BRG Output
(Shift Clock)
TXx (pin)
TXxIF bit
(Interrupt Reg. Flag)
TRMT bit
(Transmit Shift
Reg. Empty Flag)
Word 1
Word 2
1 TCY
Start bit
bit 0
Word 1
Transmit Shift Reg.
1 TCY
bit 1
Word 1
bit 7/8
Stop bit
Start bit
bit 0
Word 2
Word 2
Transmit Shift Reg.
Note: This timing diagram shows two consecutive transmissions.
DS39960D-page 338
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