參數(shù)資料
型號： KSZ8851-16MLL TR
廠商： Micrel Inc
文件頁數(shù)： 71/84頁
文件大?。?/td> 0K
描述： IC MAC CTLR 1PORT W/BUS 48LQFP
產(chǎn)品培訓(xùn)模塊： KSZ8851 10/100 Embedded Controllers
標(biāo)準(zhǔn)包裝： 1,000
控制器類型： 以太網(wǎng)控制器，MAC/PHY
接口： 總線
電源電壓： 1.8V，2.5V，3.3V
工作溫度： 0°C ~ 70°C
安裝類型： 表面貼裝
封裝/外殼： 48-LQFP
供應(yīng)商設(shè)備封裝： 48-LQFP（7x7）
包裝： 帶卷 (TR)
2002 Microchip Technology Inc.
DS30325B-page 71
PIC16F7X
10.1
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 10-1 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
integer value for the SPBRG register can be calculated
using the formula in Table 10-1. 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 FOSC/(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.
10.1.1
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 10-1:
BAUD RATE FORMULA
TABLE 10-2:
REGISTERS ASSOCIATED WITH BAUD RATE GENERATOR
SYNC
BRGH = 0 (Low Speed)
BRGH = 1 (High Speed)
0
1
(Asynchronous) Baud Rate = FOSC/(64(X+1))
(Synchronous) Baud Rate = FOSC/(4(X+1))
Baud Rate = FOSC/(16(X+1))
N/A
X = value in SPBRG (0 to 255)
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
TXSTA
CSRC
TX9
TXEN
SYNC
—
BRGH
TRMT
TX9D
0000 -010
18h
RCSTA
SPEN
RX9
SREN
CREN
—
FERR
OERR RX9D 0000 -00x
0000 -00x
99h
SPBRG
Baud Rate Generator Register
0000 0000
Legend: x = unknown, - = unimplemented, read as '0'. Shaded cells are not used by the BRG.
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