參數(shù)資料
型號: ATTINY13V-10SUR
廠商: Atmel
文件頁數(shù): 34/176頁
文件大?。?/td> 0K
描述: MCU AVR 1KB FLASH 10MHZ 8SOIC
產(chǎn)品培訓模塊: tinyAVR Introduction
標準包裝: 2,000
系列: AVR® ATtiny
核心處理器: AVR
芯體尺寸: 8-位
速度: 10MHz
外圍設備: 欠壓檢測/復位,POR,PWM,WDT
輸入/輸出數(shù): 6
程序存儲器容量: 1KB(512 x 16)
程序存儲器類型: 閃存
EEPROM 大小: 64 x 8
RAM 容量: 64 x 8
電壓 - 電源 (Vcc/Vdd): 1.8 V ~ 5.5 V
數(shù)據(jù)轉換器: A/D 4x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 8-SOIC(0.209",5.30mm 寬)
包裝: 帶卷 (TR)
其它名稱: ATTINY13V-10SUR-ND
ATTINY13V-10SURTR
2010-2011 Microchip Technology Inc.
Preliminary
DS41430C-page 129
PIC16(L)F720/721
16.2
AUSART Baud Rate Generator
(BRG)
The Baud Rate Generator (BRG) is an 8-bit timer that
is dedicated to the support of both the asynchronous
and synchronous AUSART operation.
The SPBRG register determines the period of the free
running baud rate timer. In Asynchronous mode the
multiplier of the baud rate period is determined by the
BRGH bit of the TXSTA register. In Synchronous mode,
the BRGH bit is ignored.
Table 16-3 contains the formulas for determining the
baud rate. Example 16-1 provides a sample calculation
for determining the baud rate and baud rate error.
Typical baud rates and error values for various
asynchronous modes have been computed for your
convenience and are shown in Table 16-5. It may be
advantageous to use the high baud rate (BRGH = 1), to
reduce the baud rate error.
Writing a new value to the SPBRG register causes the
BRG timer to be reset (or cleared). This ensures that
the BRG does not wait for a timer overflow before
outputting the new baud rate.
EXAMPLE 16-1:
CALCULATING BAUD
RATE ERROR
For a device with FOSC of 16 MHz, desired baud rate of
9600, and Asynchronous mode with SYNC = 0 and BRGH
= 0 (as seen in Table 16-5):
Solving for SPBRG:
SPBRG
FOSC
64 Desired Baud Rate
---------------------------------------------------------
1
=
Desired Baud Rate
FOSC
64 SPBRG
1
+
---------------------------------------
=
16000000
64 9600
------------------------
1
=
25.042
25
==
Actual Baud Rate
16000000
64 25
1
+
---------------------------
=
9615
=
Error
Actual Baud Rate Desired Baud Rate
Desired Baud Rate
--------------------------------------------------------------------------------------------------
100
=
9615 9600
9600
------------------------------
100 0.16%
==
%
TABLE 16-3:
BAUD RATE FORMULAS
Configuration Bits
AUSART Mode
Baud Rate Formula
SYNC
BRGH
00
Asynchronous
FOSC/[64 (n+1)]
01
Asynchronous
FOSC/[16 (n+1)]
1x
Synchronous
FOSC/[4 (n+1)]
Legend:
x = Don’t care, n = value of SPBRG register
TABLE 16-4:
REGISTERS ASSOCIATED WITH THE BAUD RATE GENERATOR
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Register
on Page
RCSTA
SPEN
RX9
SREN
CREN
ADDEN
FERR
OERR
RX9D
SPBRG
BRG7
BRG6
BRG5
BRG4
BRG3
BRG2
BRG1
BRG0
TXSTA
CSRC
TX9
TXEN
SYNC
—BRGH
TRMT
TX9D
Legend: x = unknown, - = unimplemented read as ‘0’. Shaded cells are not used for the Baud Rate Generator.
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