データシートサーチシステム
  Japanese  ▼
ALLDATASHEET.JP

X  

ATMEGA1280 データシート(PDF) 22 Page - ATMEL Corporation

部品番号 ATMEGA1280
部品情報  8-bit Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
Download  449 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
メーカー  ATMEL [ATMEL Corporation]
ホームページ  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA1280 データシート(HTML) 22 Page - ATMEL Corporation

Back Button ATMEGA1280 Datasheet HTML 18Page - ATMEL Corporation ATMEGA1280 Datasheet HTML 19Page - ATMEL Corporation ATMEGA1280 Datasheet HTML 20Page - ATMEL Corporation ATMEGA1280 Datasheet HTML 21Page - ATMEL Corporation ATMEGA1280 Datasheet HTML 22Page - ATMEL Corporation ATMEGA1280 Datasheet HTML 23Page - ATMEL Corporation ATMEGA1280 Datasheet HTML 24Page - ATMEL Corporation ATMEGA1280 Datasheet HTML 25Page - ATMEL Corporation ATMEGA1280 Datasheet HTML 26Page - ATMEL Corporation Next Button
Zoom Inzoom in Zoom Outzoom out
 22 / 449 page
background image
22
ATmega640/1280/1281/2560/2561
2549K–AVR–01/07
EEPROM Data Memory
The ATmega640/1280/1281/2560/2561 contains 4K bytes of data EEPROM memory. It
is organized as a separate data space, in which single bytes can be read and written.
The EEPROM has an endurance of at least 100,000 write/erase cycles. The access
between the EEPROM and the CPU is described in the following, specifying the
EEPROM Address Registers, the EEPROM Data Register, and the EEPROM Control
Register.
For a detailed description of SPI, JTAG and Parallel data downloading to the EEPROM,
see “Serial Downloading” on page 356, “Programming via the JTAG Interface” on page
361, and “Programming the EEPROM” on page 350 respectively.
EEPROM Read/Write Access
The EEPROM Access Registers are accessible in the I/O space, see “Register Descrip-
tion” on page 32.
The write access time for the EEPROM is given in Table 5 on page 22. A self-timing
function, however, lets the user software detect when the next byte can be written. If the
user code contains instructions that write the EEPROM, some precautions must be
taken. In heavily filtered power supplies, V
CC is likely to rise or fall slowly on power-
up/down. This causes the device for some period of time to run at a voltage lower than
specified as minimum for the clock frequency used. See “Preventing EEPROM Corrup-
tion” on page 24. for details on how to avoid problems in these situations.
In order to prevent unintentional EEPROM writes, a specific write procedure must be fol-
lowed. See the description of the EEPROM Control Register for details on this, “Register
Description” on page 32.
When the EEPROM is read, the CPU is halted for four clock cycles before the next
instruction is executed. When the EEPROM is written, the CPU is halted for two clock
cycles before the next instruction is executed.
The calibrated Oscillator is used to time the EEPROM accesses. Table 5 lists the typical
programming time for EEPROM access from the CPU.
The following code examples show one assembly and one C function for writing to the
EEPROM. The examples assume that interrupts are controlled (e.g. by disabling inter-
rupts globally) so that no interrupts will occur during execution of these functions. The
examples also assume that no Flash Boot Loader is present in the software. If such
code is present, the EEPROM write function must also wait for any ongoing SPM com-
mand to finish.
Table 5. EEPROM Programming Time
Symbol
Number of Calibrated RC Oscillator Cycles
Typ Programming Time
EEPROM write
(from CPU)
26,368
3.3 ms


同様の部品番号 - ATMEGA1280

メーカー部品番号データシート部品情報
logo
ATMEL Corporation
ATMEGA1280 ATMEL-ATMEGA1280 Datasheet
2Mb / 407P
   8- BIT Microcontroller with 256K Bytes In-System Programmable Flash
2549A-AVR-03/05
ATMEGA1280 ATMEL-ATMEGA1280 Datasheet
465Kb / 35P
   8-bit Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
2549KS-AVR-01/07
ATMEGA1280 ATMEL-ATMEGA1280 Datasheet
1Mb / 38P
   8-bit Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
2549MS-AVR-09/10
ATMEGA1280 ATMEL-ATMEGA1280 Datasheet
1Mb / 40P
   8-bit Atmel Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
2549NS-AVR-05/11
ATMEGA1280 ATMEL-ATMEGA1280 Datasheet
352Kb / 2P
   DEBUG AVR APPLICATIONS USING JTAG OR DEBUGWIRE INTERFACE
AVR-02/04/0M
More results

同様の説明 - ATMEGA1280

メーカー部品番号データシート部品情報
logo
ATMEL Corporation
ATMEGA640_071 ATMEL-ATMEGA640_071 Datasheet
974Kb / 37P
   8-bit Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
ATMEGA640 ATMEL-ATMEGA640_07 Datasheet
465Kb / 35P
   8-bit Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
2549KS-AVR-01/07
ATMEGA640 ATMEL-ATMEGA640_10 Datasheet
1Mb / 38P
   8-bit Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
2549MS-AVR-09/10
ATMEGA640V ATMEL-ATMEGA640V_11 Datasheet
1Mb / 40P
   8-bit Atmel Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
2549NS-AVR-05/11
ATMEGA640 ATMEL-ATMEGA640_12 Datasheet
1Mb / 40P
   8-bit Atmel Microcontroller with 64K 128K 256K Bytes In-System Programmable Flash
ATMEGA1281-16AUR ATMEL-ATMEGA1281-16AUR Datasheet
1Mb / 40P
   8-bit Atmel Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
2549PS-AVR-10/2012
ATMEGA603 ATMEL-ATMEGA603 Datasheet
280Kb / 10P
   8-Bit Microcontroller with 64K/128K Bytes In-System Programmable Flash
ATMEGA64 ATMEL-ATMEGA64_08 Datasheet
5Mb / 393P
   8-bit Microcontroller with 64K Bytes In-System Programmable Flash
ATMEGA644V ATMEL-ATMEGA644V_10 Datasheet
787Kb / 23P
   8-bit Microcontroller with 64K Bytes In-System Programmable Flash
ATMEGA644_0702 ATMEL-ATMEGA644_0702 Datasheet
4Mb / 374P
   8-bit Microcontroller with 64K Bytes In- System Programmable Flash
More results


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


データシート ダウンロード

Go To PDF Page


リンク URL




プライバシーポリシー
ALLDATASHEET.JP
ALLDATASHEETはお客様のビジネスに役立ちますか?  [ DONATE ] 

Alldatasheetは   |   広告   |   お問い合わせ   |   プライバシーポリシー   |   リンク交換   |   メーカーリスト
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
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com