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PIC16F688-E/ST bảng dữ liệu(PDF) 89 Page - Microchip Technology

tên linh kiện PIC16F688-E/ST
Giải thích chi tiết về linh kiện  14-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology
PDF  174 Pages
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nhà sản xuất  MICROCHIP [Microchip Technology]
Trang chủ  http://www.microchip.com
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 2004 Microchip Technology Inc.
Preliminary
DS41203B-page 87
PIC16F688
FIGURE 10-2:
USART TRANSMIT BLOCK DIAGRAM
FIGURE 10-3:
ASYNCHRONOUS TRANSMISSION
FIGURE 10-4:
ASYNCHRONOUS TRANSMISSION (BACK TO BACK)
TXIF
TXIE
Interrupt
TXEN
Baud Rate CLK
SPBRG
Baud Rate Generator
TX9D
MSb
LSb
Data Bus
TXREG Register
TSR Register
(8)
0
TX9
TRMT
SPEN
RC4/C2OUT/TX/CK pin
Pin Buffer
and Control
8
• • •
SPBRGH
BRG16
Word 1
Stop bit
Word 1
Transmit Shift Reg
Start bit
bit 0
bit 1
bit 7/8
Write to TXREG
Word 1
BRG Output
(Shift Clock)
RC4/C2OUT/TX/CK
TXIF bit
(Transmit Buffer
Reg. Empty Flag)
TRMT bit
(Transmit Shift
Reg. Empty Flag)
1 TCY
pin
Transmit Shift Reg.
Write to TXREG
BRG Output
(Shift Clock)
RC4/C2OUT/TX/CK
TXIF bit
(Interrupt Reg. Flag)
TRMT bit
(Transmit Shift
Reg. Empty Flag)
Word 1
Word 2
Word 1
Word 2
Start bit
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
pin



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