Motor de Búsqueda de Datasheet de Componentes Electrónicos
Selected language     Spanish  ▼

Delete All
ON OFF
ALLDATASHEET.ES

X  

Preview PDF Download HTML

MC68HC08AS32A Datasheet(PDF) 78 Page - Motorola, Inc

No. de Pieza. MC68HC08AS32A
Descripción  Microcontrollers
Descarga  296 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Fabricante  MOTOROLA [Motorola, Inc]
Página de inicio  http://www.freescale.com
Logo 

MC68HC08AS32A Datasheet(HTML) 78 Page - Motorola, Inc

Zoom Inzoom in Zoom Outzoom out
 78 / 296 page
background image
Byte Data Link Controller-Digital (BDLC-D)
Data Sheet
MC68HC08AS32A — Rev. 1
78
Byte Data Link Controller-Digital (BDLC-D)
MOTOROLA
Valid SOF Symbol
In Figure 4-11(4), if the active-to-passive received transition beginning the next
data bit (or symbol) occurs between c and d, the current symbol would be
considered a valid SOF symbol.
Valid BREAK Symbol
In Figure 4-12, if the next active-to-passive received transition does not occur
until after e, the current symbol will be considered a valid BREAK symbol. A
BREAK symbol should be followed by a start-of-frame (SOF) symbol beginning
the next message to be transmitted onto the J1850 bus. See 4.4.2 J1850 Frame
Format for BDLC response to BREAK symbols.
Figure 4-12. J1850 VPW Received BREAK Symbol Times
4.4.5 Message Arbitration
Message arbitration on the J1850 bus is accomplished in a non-destructive
manner, allowing the message with the highest priority to be transmitted, while any
transmitters which lose arbitration simply stop transmitting and wait for an idle bus
to begin transmitting again.
If the BDLC wants to transmit onto the J1850 bus, but detects that another
message is in progress, it waits until the bus is idle. However, if multiple nodes
begin to transmit in the same synchronization window, message arbitration will
occur beginning with the first bit after the SOF symbol and will continue with each
bit thereafter.
The variable pulse width modulation (VPW) symbols and J1850 bus electrical
characteristics are chosen carefully so that a logic 0 (active or passive type) will
always dominate over a logic 1 (active or passive type) that is simultaneously
transmitted. Hence, logic 0s are said to be dominant and logic 1s are said to be
recessive.
Whenever a node detects a dominant bit on BDRxD when it transmitted a
recessive bit, the node loses arbitration and immediately stops transmitting. This is
known as bitwise arbitration.
(2) VALID BREAK SYMBOL
240
µs
e
ACTIVE
PASSIVE
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com


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


Datasheet Download




Enlace URL




Privacy Policy
ALLDATASHEET.ES
Does ALLDATASHEET help your business so far?  [ DONATE ]  

Todo acerca de Alldatasheet   |   Publicidad   |   Contáctenos   |   Política de Privacidad   |   Favorito   |   Intercambio de Enlaces   |   Lista de Fabricantes
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