參數(shù)資料
型號： PIC16CR7X
廠商： Microchip Technology Inc.
英文描述： 28/40-Pin, 8-Bit CMOS ROM Microcontrollers
中文描述： 28/40-Pin，8位微控制器的CMOS光盤
文件頁數(shù)： 76/172頁
文件大?。?/td> 1506K
代理商： PIC16CR7X
PIC16CR7X
DS21993C-page 74
2007 Microchip Technology Inc.
FIGURE 10-1:
USART TRANSMIT BLOCK DIAGRAM
Steps to follow when setting up an Asynchronous
Transmission:
1.
Initialize the SPBRG register for the appropriate
baud rate. If a high speed baud rate is desired,
set bit BRGH (
Section 10.1 “USART Baud
Rate Generator (BRG)”
).
2.
Enable the asynchronous serial port by clearing
bit SYNC and setting bit SPEN.
3.
If interrupts are desired, then set enable bit
TXIE.
4.
If 9-bit transmission is desired, then set transmit
bit TX9.
5.
Enable the transmission by setting bit TXEN,
which will also set bit TXIF.
If 9-bit transmission is selected, the ninth bit
should be loaded in bit TX9D.
Load data to the TXREG register (starts
transmission).
If using interrupts, ensure that GIE and PEIE in
the INTCON register are set.
6.
7.
8.
FIGURE 10-2:
ASYNCHRONOUS MASTER TRANSMISSION
TXIF
TXIE
Interrupt
TXEN
Baud Rate CLK
SPBRG
Baud Rate Generator
TX9D
MSb
(8)
LSb
0
Data Bus
TXREG Register
TSR Register
TX9
TRMT
SPEN
RC6/TX/CK pin
Pin Buffer
and Control
8
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)
RC6/TX/CK (pin)
TXIF bit
(Transmit Buffer
Reg. Empty Flag)
TRMT bit
(Transmit Shift
Reg. Empty Flag)
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