參數(shù)資料
型號(hào): PIC16F787
廠商: Microchip Technology Inc.
英文描述: Enhanced FLASH 8-Bit CMOS Microcontroller with A/D Converter and EEPROM Data Memory(帶ADC轉(zhuǎn)換器和EEPROM數(shù)據(jù)存儲(chǔ)器的閃速CMOS微控制器)
中文描述: 增強(qiáng)型閃存8位CMOS微控制器與A / D轉(zhuǎn)換器和EEPROM數(shù)據(jù)存儲(chǔ)器(帶ADC的轉(zhuǎn)換器和EEPROM的數(shù)據(jù)存儲(chǔ)器的閃速的CMOS微控制器)
文件頁數(shù): 77/170頁
文件大?。?/td> 4191K
代理商: PIC16F787
2003 Microchip Technology Inc.
Preliminary
DS40300C-page 75
PIC16F62X
FIGURE 12-5:
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 12.1)
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.
6.
If 9-bit transmission is selected, the ninth bit
should be loaded in bit TX9D.
7.
Load data to the TXREG register (starts
transmission).
FIGURE 12-6:
ASYNCHRONOUS 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
RB2/TX/CK pin
Pin Buffer
and Control
8
2 2 2
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)
RB2/TX/CK (pin)
TXIF bit
(Transmit buffer
reg. empty flag)
TRMT bit
(Transmit shift
reg. empty flag)
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