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) 42 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) 42 Page - Motorola, Inc

Zoom Inzoom in Zoom Outzoom out
 42 / 296 page
background image
Memory
Data Sheet
MC68HC08AS32A — Rev. 1
42
Memory
MOTOROLA
prior to any EEPROM program or erase operations (see 2.5.1.1 EEPROM
Configuration and 2.5.1.2 EEPROM Timebase Requirements).
2.5.1.3 EEPROM Program/Erase Protection
The EEPROM has a special feature that designates the 16 bytes of addresses from
$08F0 to $08FF to be permanently secured. This program/erase protect option is
enabled by programming the EEPRTCT bit in the EEPROM non-volatile register
(EENVR) to a logic 0.
Once the EEPRTCT bit is programmed to 0 for the first time:
Programming and erasing of secured locations $08F0 to $08FF is
permanently disabled.
Secured locations $08F0 to $08FF can be read as normal.
Programming and erasing of EENVR is permanently disabled.
Bulk and block erase operations are disabled for the protected locations
$0800–$08EF, $0900–$09FF.
Single byte program and erase operations are still available for locations
$0800–$08EF and $0900–$09FF for all bytes that are not protected by the
EEPROM block protect EEBPx bits (see 2.5.1.4 EEPROM Block
Protection and 2.5.2.2 EEPROM Array Configuration Register).
NOTE:
Once armed, the protect option is permanently enabled. As a consequence, all
functions in the EENVR will remain in the state they were in immediately before the
security was enabled.
2.5.1.4 EEPROM Block Protection
The 512 bytes of EEPROM are divided into four 128-byte blocks. Each of these
blocks can be protected from erase/program operations by setting the EEBPx bit
in the EENVR. Table 2-2 shows the address ranges for the blocks.
These bits are effective after a reset or upon read of the EENVR register. The block
protect configuration can be modified by erasing/programming the corresponding
bits in the EENVR register and then reading the EENVR register. See 2.5.2.2
EEPROM Array Configuration Register for more information.
NOTE:
Once EEDIVSECD in the EEDIVHNVR is programmed to 0 and after a system
reset, the EEDIV security feature is permanently enabled because the
EEDIVSECD bit in the EEDIVH is always loaded with 0 thereafter. Once this
Table 2-2. EEPROM Array Address Blocks
Block Number (EEBPx)
Address Range
EEBP0
$0800–$087F
EEBP1
$0880–$08FF
EEBP2
$0900–$097F
EEBP3
$0980–$09FF
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