Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

AT90S4433 Datasheet(PDF) 85 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) 85 Page - ATMEL Corporation

Back Button AT90S4433 Datasheet HTML 81Page - ATMEL Corporation AT90S4433 Datasheet HTML 82Page - ATMEL Corporation AT90S4433 Datasheet HTML 83Page - ATMEL Corporation AT90S4433 Datasheet HTML 84Page - ATMEL Corporation AT90S4433 Datasheet HTML 85Page - ATMEL Corporation AT90S4433 Datasheet HTML 86Page - ATMEL Corporation AT90S4433 Datasheet HTML 87Page - ATMEL Corporation AT90S4433 Datasheet HTML 88Page - ATMEL Corporation AT90S4433 Datasheet HTML 89Page - ATMEL Corporation Next Button
Zoom Inzoom in Zoom Outzoom out
 85 / 126 page
background image
85
AT90S/LS4433
1042H–AVR–04/03
Memory
Programming
Program and Data
Memory Lock Bits
The AT90S4433 MCU provides two Lock bits, which can be left unprogrammed (“1”) or
can be programmed (“0”) to obtain the additional features listed in Table 28. The Lock
bits can only be erased with the Chip Erase command.
Note:
1. In Parallel mode, programming of the Fuse bits are also disabled. Program the Fuse
bits before programming the Lock bits.
Fuse Bits
The AT90S4433 has six Fuse bits, SPIEN, BODLEVEL, BODEN and CKSEL2..0.
When the SPIEN Fuse is programmed (“0”), Serial Program and Data Downloading
is enabled. Default value is programmed (“0”). This bit is not accessible in Serial
Programming mode.
The BODLEVEL Fuse selects the Brown-out Detection Level and changes the start-
up times. See “Brown-out Detection” on page 25. Default value is unprogrammed
(“1”).
When the BODEN Fuse is programmed (“0”), the Brown-out Detector is enabled.
See “Brown-out Detection” on page 25. Default value is unprogrammed (“1”).
CKSEL2..0: See Table 5 on page 23 for which combination of CKSEL2..0 to use.
Default value is “010”.
Signature Bytes
All Atmel microcontrollers have a 3-byte signature code that identifies the device. This
code can be read in both serial and parallel mode. The three bytes reside in a separate
address space.
For the AT90S4433(1) they are:
1.
$000: $1E (indicates manufactured by Atmel)
2.
$001: $92 (indicates 4 KB Flash memory)
3.
$002: $03 (indicates AT90S4433 device when signature byte $001 is $92)
Note:
1. When both Lock bits are programmed (Lock mode 3), the signature bytes cannot be
read in Serial mode. Reading the signature bytes will return $00, $01 and $02.
Table 28. Lock Bit Protection Modes
Memory Lock Bits
Protection Type
Mode
LB1
LB2
1
1
1
No memory lock features enabled.
2
0
1
Further programming of the Flash and EEPROM is disabled.
(1)
3
0
0
Same as mode 2, and verify is also disabled.


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