參數(shù)資料
型號(hào)： 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(shù)： 65/156頁
文件大?。?/td> 2816K
代理商： 16F871
1999 Microchip Technology Inc.
Preliminary
DS30569A-page 65
PIC16F870/871
9.1
USART Baud Rate Generator (BRG)
The BRG supports both the asynchronous and syn-
chronous modes of the USART. It is a dedicated 8-bit
baud rate generator. The SPBRG register controls the
period of a free running 8-bit timer. In asynchronous
mode, bit BRGH (TXSTA<2>) also controls the baud
rate. In synchronous mode, bit BRGH is ignored.
Table 9-1 shows the formula for computation of the
baud rate for different USART modes which only apply
in master mode (internal clock).
Given the desired baud rate and Fosc, the nearest inte-
ger value for the SPBRG register can be calculated
using the formula in Table 9-1. From this, the error in
baud rate can be determined.
It may be advantageous to use the high baud rate
(BRGH = 1) even for slower baud clocks. This is
because the F
OSC
/(16(X + 1)) equation can reduce the
baud rate error in some cases.
Writing a new value to the SPBRG register causes the
BRG timer to be reset (or cleared). This ensures the
BRG does not wait for a timer overflow before output-
ting the new baud rate.
9.1.1
SAMPLING
The data on the RC7/RX/DT pin is sampled three times
by a majority detect circuit to determine if a high or a
low level is present at the RX pin.
TABLE 9-1:
BAUD RATE FORMULA
TABLE 9-2:
REGISTERS ASSOCIATED WITH BAUD RATE GENERATOR
SYNC
BRGH = 0 (Low Speed)
BRGH = 1 (High Speed)
0
1
(Asynchronous) Baud Rate = F
OSC
/(64(X+1))
(Synchronous) Baud Rate = F
OSC
/(4(X+1))
X = value in SPBRG (0 to 255)
Baud Rate= F
OSC
/(16(X+1))
NA
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on:
POR,
BOR
Value on all
other
resets
98h
18h
99h
Legend:
x
= unknown,
-
= unimplemented read as '0'. Shaded cells are not used by the BRG.
TXSTA
RCSTA
SPBRG
CSRC
SPEN
Baud Rate Generator Register
TX9
RX9
TXEN
SREN
SYNC
CREN
—
BRGH
FERR
TRMT
OERR RX9D
0000 000x
TX9D
0000 -010
0000 -010
ADDEN
0000 000x
0000 0000
0000 0000
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