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| 型號(hào)： | MC80C52XXX-20P883D |
| 廠商： | TEMIC SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 20 MHz, MICROCONTROLLER, CDIP40 |
| 文件頁(yè)數(shù)： | 72/132頁(yè) |
| 文件大?。?/td> | 10886K |
| 代理商： | MC80C52XXX-20P883D |
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277
8151H–AVR–02/11
ATmega128A
25. Boot Loader Support – Read-While-Write Self-Programming
25.1
Features
Read-While-Write Self-Programming
Flexible Boot Memory Size
High Security (Separate Boot Lock Bits for a Flexible Protection)
Separate Fuse to Select Reset Vector
Optimized Page(1) Size
Code Efficient Algorithm
Efficient Read-Modify-Write Support
Note:
1. A page is a section in the flash consisting of several bytes (see Table 26-10 on page 296) used
during programming. The page organization does not affect normal operation.
25.2
Overview
The Boot Loader Support provides a real Read-While-Write Self-Programming mechanism for
downloading and uploading program code by the MCU itself. This feature allows flexible applica-
tion software updates controlled by the MCU using a Flash-resident Boot Loader program. The
Boot Loader program can use any available data interface and associated protocol to read code
and write (program) that code into the Flash memory, or read the code from the program mem-
ory. The program code within the Boot Loader section has the capability to write into the entire
Flash, including the Boot Loader memory. The Boot Loader can thus even modify itself, and it
can also erase itself from the code if the feature is not needed anymore. The size of the Boot
Loader memory is configurable with fuses and 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 differ-
ent levels of protection.
25.3
Application and Boot Loader Flash Sections
The Flash memory is organized in two main sections, the Application section and the Boot
Loader section (see Figure 25-2). The size of the different sections is configured by the
BOOTSZ fuses as shown in
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MD80C32-25SB | 8-BIT, 25 MHz, MICROCONTROLLER, CDIP40 |
| MD80C52EXXX-30P883 | 8-BIT, MROM, 30 MHz, MICROCONTROLLER, CDIP40 |
| MC80C52XXX-30SCD | 8-BIT, MROM, 30 MHz, MICROCONTROLLER, CDIP40 |
| MR83C154DXXX-20/883R | 8-BIT, MROM, 20 MHz, MICROCONTROLLER, CQCC44 |
| MD80C32-12 | 8-BIT, 12 MHz, MICROCONTROLLER, CDIP40 |
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| MC80D21000G | 制造商:COR 功能描述:RN |
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| MC80F0104D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-BIT SINGLE-CHIP MICROCONTROLLERS |
| MC80F0204 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-BIT SINGLE-CHIP MICROCONTROLLERS |
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