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) 41 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) 41 Page - Motorola, Inc

Zoom Inzoom in Zoom Outzoom out
 41 / 296 page
background image
Memory
Electrically Erasable Programmable ROM (EEPROM)
MC68HC08AS32A — Rev. 1
Data Sheet
MOTOROLA
Memory
41
On-chip charge pump for programming/erasing
Program/erase protection option
AUTO bit driven programming/erasing time feature
2.5.1 Functional Description
The 512 bytes of EEPROM are located at $0800–$09FF and can be programmed
or erased without an additional external high voltage supply. The program and
erase operations are enabled through the use of an internal charge pump. An
internal state machine controls the program and erase timing. For each byte of
EEPROM, the write/erase endurance is 10,000 cycles.
2.5.1.1 EEPROM Configuration
The 8-bit EEPROM non-volatile register (EENVR) and the 16-bit EEPROM
timebase divider non-volatile register (EEDIVNVR) contain the default settings for
the following EEPROM configurations:
EEPROM timebase reference
EEPROM program/erase protection
EEPROM block protection
EENVR and EEDIVNR are non-volatile EEPROM registers. They are programmed
and erased in the same way as EEPROM bytes. The contents of these registers
are loaded into their respective volatile registers during a MCU reset. The values
in these read/write volatile registers define the EEPROM configurations.
For EENVR, the corresponding volatile register is the EEPROM array configuration
register (EEACR). For the EEDIVNVR (two 8-bit registers: EEDIVHNVR and
EEDIVLNVR), the corresponding volatile register is the EEPROM divider register
(EEDIV: EEDIVH and EEDIVL).
2.5.1.2 EEPROM Timebase Requirements
A 35
µs timebase is required by the EEPROM control circuit for program and erase
of EEPROM content. This timebase is derived from dividing the CGMXCLK or bus
clock (selected by EEDIVCLK bit in mask option register B) using a timebase
divider circuit controlled by the 16-bit EEPROM timebase divider EEDIV register
(EEDIVH and EEDIVL).
As the CGMXCLK or bus clock is user selected, the EEPROM timebase divider
register must be configured with the appropriate value to obtain the 35
µs. The
timebase divider value is calculated by using the following formula:
EEDIV = INT [Reference Frequency (Hz) x 35 x 10–6 + 0.5]
This value is written to the EEPROM timebase divider register (EEDIVH and
EEDIVL) or programmed into the EEPROM timebase divider non-volatile register
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