Microchip Technology IC MCU 8BIT PIC18F65K22-I/PT TQFP-64 MCP PIC18F65K22-I/PT Data Sheet
Product codes
PIC18F65K22-I/PT
PIC18F87K22 FAMILY
DS39960D-page 338
2009-2011 Microchip Technology Inc.
FIGURE 22-3:
EUSART TRANSMIT BLOCK DIAGRAM
FIGURE 22-4:
ASYNCHRONOUS TRANSMISSION
FIGURE 22-5:
ASYNCHRONOUS TRANSMISSION (BACK-TO-BACK)
TXxIF
TXxIE
Interrupt
TXEN
Baud Rate CLK
SPBRGx
Baud Rate Generator
TX9D
MSb
LSb
Data Bus
TXREGx Register
TSR Register
(8)
0
TX9
TRMT
SPEN
TXx Pin
Pin Buffer
and Control
8
SPBRGHx
BRG16
Word 1
Word 1
Transmit Shift Reg
Start bit
bit 0
bit 1
bit 7/8
Write to TXREGx
BRG Output
(Shift Clock)
TXx (pin)
TXxIF bit
(Transmit Buffer
Reg. Empty Flag)
TRMT bit
(Transmit Shift
Reg. Empty Flag)
1 T
CY
Stop bit
Word 1
Transmit Shift Reg.
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
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 T
CY
1 T
CY
Start bit