전자부품 데이터시트 검색엔진
  Korean  ▼
ALLDATASHEET.CO.KR

X  

Preview PDF HTML

AT90SCR100 데이터시트(PDF) 234 Page - ATMEL Corporation

부품명 AT90SCR100
상세설명  8-bit Microcontroller for Smart Card Readers
PDF  433 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90SCR100 데이터시트(HTML) 234 Page - ATMEL Corporation

Back Button AT90SCR100 Datasheet HTML 230Page - ATMEL Corporation AT90SCR100 Datasheet HTML 231Page - ATMEL Corporation AT90SCR100 Datasheet HTML 232Page - ATMEL Corporation AT90SCR100 Datasheet HTML 233Page - ATMEL Corporation AT90SCR100 Datasheet HTML 234Page - ATMEL Corporation AT90SCR100 Datasheet HTML 235Page - ATMEL Corporation AT90SCR100 Datasheet HTML 236Page - ATMEL Corporation AT90SCR100 Datasheet HTML 237Page - ATMEL Corporation AT90SCR100 Datasheet HTML 238Page - ATMEL Corporation Next Button
Zoom Inzoom in Zoom Outzoom out
 234 / 433 page
background image
234
TPR0327AY–SMS–30Jan09
AT90SCR100
Table 18-1 contains equations for calculating the baud rate (in bits per second) and for calculat-
ing the UBRR0 value for each mode of operation using an internally generated clock source.
Some examples of UBRR0 values for some system clock frequencies are found in Table 18-9 on
page 254.
18.4.2
Double Speed Operation (U2X0)
The transfer rate can be doubled by setting the U2X0 bit in UCSR0A. Setting this bit only has
effect for the asynchronous operation. Set this bit to zero when using synchronous operation.
Setting this bit will reduce the divisor of the baud rate divider from 16 to 8, effectively doubling
the transfer rate for asynchronous communication. Note however that the Receiver will in this
case only use half the number of samples (reduced from 16 to 8) for data sampling and clock
recovery, and therefore a more accurate baud rate setting and system clock are required when
this mode is used. For the Transmitter, there are no downsides.
Table 18-1.
Equations for Calculating Baud Rate Register Setting
Operating Mode
Equation for Calculating Baud
Rate
(1)
1.
The baud rate is defined to be the transfer rate in bit per second (bps)
BAUD
Baud rate (in bits per second, bps)
f
OSCSystem Oscillator clock frequency injected in UART block: clk
IO
UBRRn
Contents of the UBRRH0 and UBRRL0 Registers, (0-4095)
Equation for Calculating UBRR
Value
Asynchronous Normal
mode (U2X0 = 0)
Asynchronous Double
Speed mode (U2X0 = 1)
Synchronous Master
mode
BAUD
f
OSC
16 UBRR01
+
()
------------------------------------------
=
UBRR0
f
OSC
16BAUD
------------------------
1
–
=
BAUD
f
OSC
8 UBRR01
+
()
---------------------------------------
=
UBRR0
f
OSC
8BAUD
--------------------
1
–
=
BAUD
f
OSC
2 UBRR01
+
()
---------------------------------------
=
UBRR0
f
OSC
2BAUD
--------------------
1
–
=



Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100  ...More


데이터시트 다운로드

Go To PDF Page


링크 URL



ALLDATASHEET 가 귀하에 도움이 되셨나요?  [ DONATE ] 

Alldatasheet는?   |   광고문의   |   운영자에게 연락하기   |   개인정보취급방침   |   링크 투 데이터시트    |   링크교환   |   제조사별 검색
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com