參數資料
型號: 16F871
廠商: Microchip Technology Inc.
英文描述: CAT 5E CROSSOVER PATCH CORD CABLE GREEN 6 FT
中文描述: 28/40-Pin 8位CMOS閃存微控制器
文件頁數: 71/156頁
文件大?。?/td> 2816K
代理商: 16F871
1999 Microchip Technology Inc.
Preliminary
DS30569A-page 71
PIC16F870/871
9.2.3
SETTING UP 9-BIT MODE WITH ADDRESS
DETECT
Steps to follow when setting up an Asynchronous
Reception with Address Detect Enabled:
Initialize the SPBRG register for the appropriate
baud rate. If a high speed baud rate is desired, set
bit BRGH.
Enable the asynchronous serial port by clearing
bit SYNC and setting bit SPEN.
If interrupts are desired, then set enable bit RCIE.
Set bit RX9 to enable 9-bit reception.
Set ADDEN to enable address detect.
Enable the reception by setting enable bit CREN.
Flag bit RCIF will be set when reception is com-
plete, and an interrupt will be generated if enable
bit RCIE was set.
Read the RCSTA register to get the ninth bit and
determine if any error occurred during reception.
Read the 8-bit received data by reading the
RCREG register, to determine if the device is
being addressed.
If any error occurred, clear the error by clearing
enable bit CREN.
If the device has been addressed, clear the
ADDEN bit to allow data bytes and address bytes
to be read into the receive buffer, and interrupt the
CPU.
FIGURE 9-6:
USART RECEIVE BLOCK DIAGRAM
x64 Baud Rate CLK
SPBRG
Baud Rate Generator
RC7/RX/DT
Pin Buffer
and Control
SPEN
Data
Recovery
CREN
OERR
FERR
RSR register
MSb
LSb
RX9D
RCREG Register
FIFO
Interrupt
RCIF
RCIE
Data Bus
8
÷
64
÷
16
or
Stop
Start
(8)
7
1
0
RX9
RX9
ADDEN
RX9
ADDEN
RSR<8>
Enable
Load of
Receive
Buffer
8
8
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