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

Delete All
ON OFF
ALLDATASHEET.ES

X  

Preview PDF Download HTML

MC908QC8CDRE Datasheet(PDF) 36 Page - Freescale Semiconductor, Inc

No. de Pieza. MC908QC8CDRE
Descripción  M68HC08 Microcontrollers
Descarga  274 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Fabricante  FREESCALE [Freescale Semiconductor, Inc]
Página de inicio  http://www.freescale.com
Logo 

MC908QC8CDRE Datasheet(HTML) 36 Page - Freescale Semiconductor, Inc

Zoom Inzoom in Zoom Outzoom out
 36 / 274 page
background image
Memory
MC68HC908QC16 • MC68HC908QC8 • MC68HC908QC4 Data Sheet, Rev. 5
36
Freescale Semiconductor
2.6 FLASH Memory (FLASH)
The FLASH memory is intended primarily for program storage. In-circuit programming allows the
operating program to be loaded into the FLASH memory after final assembly of the application product.
It is possible to program the entire array through the single-wire monitor mode interface. Because no
special voltages are needed for FLASH erase and programming operations, in-application programming
is also possible through other software-controlled communication paths.
This subsection describes the operation of the embedded FLASH memory. The FLASH memory can be
read, programmed, and erased from the internal VDD supply. The program and erase operations are
enabled through the use of an internal charge pump.
The minimum size of FLASH memory that can be erased is 64 bytes; and the maximum size of FLASH
memory that can be programmed in a program cycle is 32 bytes (a row). Program and erase operations
are facilitated through control bits in the FLASH control register (FLCR). Details for these operations
appear later in this section.
NOTE
An erased bit reads as a 1 and a programmed bit reads as a 0. A security
feature prevents viewing of the FLASH contents.(1)
2.6.1 FLASH Control Register
The FLASH control register (FLCR) controls FLASH program and erase operations.
HVEN — High Voltage Enable Bit
This read/write bit enables high voltage from the charge pump to the memory for either program or
erase operation. It can only be set if either PGM =1 or ERASE =1 and the proper sequence for
program or erase is followed.
1 = High voltage enabled to array and charge pump on
0 = High voltage disabled to array and charge pump off
MASS — Mass Erase Control Bit
This read/write bit configures the memory for mass erase operation.
1 = Mass erase operation selected
0 = Mass erase operation unselected
ERASE — Erase Control Bit
This read/write bit configures the memory for erase operation. ERASE is interlocked with the PGM bit
such that both bits cannot be equal to 1 or set to 1 at the same time.
1 = Erase operation selected
0 = Erase operation unselected
1. No security feature is absolutely secure. However, Freescale’s strategy is to make reading or copying the FLASH difficult
for unauthorized users.
Bit 7
654321
Bit 0
Read:
0000
HVEN
MASS
ERASE
PGM
Write:
Reset:
00000000
= Unimplemented
Figure 2-3. FLASH Control Register (FLCR)


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