 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
ATmega644PA Datasheet(PDF) 281 Page - ATMEL Corporation |
|
|
|||||||||||||||||||||||||||||
ATmega644PA Datasheet(HTML) 281 Page - ATMEL Corporation |
|
|
281 / 468 page  281 8152G–AVR–11/09 ATmega164PA/324PA/644PA/1284P Figure 25-2. Memory Sections Note: 1. The parameters in the figure above are given in Table 25-10 on page 291. 25.5 Boot Loader Lock Bits If no Boot Loader capability is needed, the entire Flash is available for application code. The Boot Loader has two separate sets of Boot Lock bits which can be set independently. This gives the user a unique flexibility to select different levels of protection. The user can select: • To protect the entire Flash from a software update by the MCU. • To protect only the Boot Loader Flash section from a software update by the MCU. • To protect only the Application Flash section from a software update by the MCU. • Allow software update in the entire Flash. See Table 25-2 on page 282 and Table 25-3 on page 282 for further details. The Boot Lock bits can be set in software and in Serial or Parallel Programming mode, but they can be cleared by a Chip Erase command only. The general Write Lock (Lock Bit mode 2) does not control the pro- gramming of the Flash memory by SPM instruction. Similarly, the general Read/Write Lock (Lock Bit mode 1) does not control reading nor writing by (E)LPM/SPM, if it is attempted. 0x0000 Flashend Program Memory BOOTSZ = '11' Application Flash Section Boot Loader Flash Section Flashend Program Memory BOOTSZ = '10' 0x0000 Program Memory BOOTSZ = '01' Program Memory BOOTSZ = '00' Application Flash Section Boot Loader Flash Section 0x0000 Flashend Application Flash Section Flashend End RWW Start NRWW Application Flash Section Boot Loader Flash Section Boot Loader Flash Section End RWW Start NRWW End RWW Start NRWW 0x0000 End RWW, End Application Start NRWW, Start Boot Loader Application Flash Section Application Flash Section Application Flash Section End Application Start Boot Loader End Application Start Boot Loader End Application Start Boot Loader |
|
Link URL |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link to Datasheet | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| 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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
