PIC18F45J50-I/SOSQTP 查看數據表（PDF） - Microchip Technology

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PIC18F45J50-I/SOSQTP

28/44-Pin, Low-Power, High-Performance USB Microcontrollers with nanoWatt XLP Technology

Microchip Technology 

PIC18F46J50 FAMILY

FIGURE 20-3:

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 20-4:

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 20-5:

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.

DS39931D-page 334

 2011 Microchip Technology Inc.

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