Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

AT90S4433 Datasheet(PDF) 56 Page - ATMEL Corporation

Part No. AT90S4433
Description  8-Bit AVR Microcontroller with 4K Bytes of In-System Programmable Flash
Download  126 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90S4433 Datasheet(HTML) 56 Page - ATMEL Corporation

Back Button AT90S4433 Datasheet HTML 52Page - ATMEL Corporation AT90S4433 Datasheet HTML 53Page - ATMEL Corporation AT90S4433 Datasheet HTML 54Page - ATMEL Corporation AT90S4433 Datasheet HTML 55Page - ATMEL Corporation AT90S4433 Datasheet HTML 56Page - ATMEL Corporation AT90S4433 Datasheet HTML 57Page - ATMEL Corporation AT90S4433 Datasheet HTML 58Page - ATMEL Corporation AT90S4433 Datasheet HTML 59Page - ATMEL Corporation AT90S4433 Datasheet HTML 60Page - ATMEL Corporation Next Button
Zoom Inzoom in Zoom Outzoom out
 56 / 126 page
background image
56
AT90S/LS4433
1042H–AVR–04/03
Multi-processor
Communication Mode
The Multi-processor Communication mode enables several slave MCUs to receive data
from a Master MCU. This is done by first decoding an address byte to find out which
MCU has been addressed. If a particular slave MCU has been addressed, it will receive
the following data bytes as normal, while the other slave MCUs will ignore the data bytes
until another address byte is received.
For an MCU to act as a Master MCU, it should enter 9-bit Transmission mode (CHR9 in
UCSRB set). The ninth bit must be one to indicate that an address byte is being trans-
mitted, and zero to indicate that a data byte is being transmitted.
For the Slave MCUs, the mechanism appears slightly differently for 8-bit and 9-bit
Reception mode. In 8-bit Reception mode (CHR9 in UCSRB cleared), the stop bit is one
for an address byte and zero for a data byte. In 9-bit Reception mode (CHR9 in UCSRB
set), the ninth bit is one for an address byte and zero for a data byte, whereas the stop
bit is always high.
The following procedure should be used to exchange data in Multi-processor Communi-
cation mode:
1.
All slave MCUs are in Multi-processor Communication mode (MPCM in UCSRA
is set).
2.
The Master MCU sends an address byte, and all Slaves receive and read this
byte. In the slave MCUs, the RXC Flag in UCSRA will be set as normal.
3.
Each Slave MCU reads the UDR Register and determines if it has been
selected. If so, it clears the MPCM bit in UCSRA, otherwise it waits for the next
address byte.
4.
For each received data byte, the receiving MCU will set the Receive Complete
Flag (RXC in UCSRA). In 8-bit mode, the receiving MCU will also generate a
Framing Error (FE in UCSRA set), since the stop bit is zero. The other Slave
MCUs, which still have the MPCM bit set, will ignore the data byte. In this case,
the UDR Register and the RXC or FE Flags will not be affected.
5.
After the last byte has been transferred, the process repeats from step 2.


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

Go To PDF Page


Link URL




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

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
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