參數資料
型號： S80C32-44:RD
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, 44 MHz, MICROCONTROLLER, PQCC44
封裝： PLASTIC, LCC-44
文件頁數： 76/152頁
文件大小： 2528K
281
8021G–AVR–03/11
ATmega329P/3290P
26. Boot Loader Support – Read-While-Write Self-Programming
26.1
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 27-13 on page 301)
used during programming. The page organization does not affect normal operation.
26.2
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.
26.3
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 26-2). The size of the different sections is configured by the
BOOTSZ Fuses as shown in Table 26-6 on page 292 and Figure 26-2. These two sections can
have different level of protection since they have different sets of Lock bits.
26.3.1
Application Section
The Application section is the section of the Flash that is used for storing the application code.
The protection level for the Application section can be selected by the application Boot Lock bits
(Boot Lock bits 0), see Table 26-2 on page 285. The Application section can never store any
Boot Loader code since the SPM instruction is disabled when executed from the Application
section.
26.3.2
BLS – Boot Loader Section
While the Application section is used for storing the application code, the The Boot Loader soft-
ware must be located in the BLS since the SPM instruction can initiate a programming when
executing from the BLS only. The SPM instruction can access the entire Flash, including the
BLS itself. The protection level for the Boot Loader section can be selected by the Boot Loader
Lock bits (Boot Lock bits 1), see Table 26-3 on page 285.
相關PDF資料
PDF描述
MQ80C52XXX-36/883 8-BIT, MROM, 36 MHz, MICROCONTROLLER, CQFP44
S80C32-L16D 8-BIT, 16 MHz, MICROCONTROLLER, PQCC44
MP80C51C-36D 8-BIT, MROM, 36 MHz, MICROCONTROLLER, PDIP40
MR80C52EXXX-16SHXXX:R 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQCC44
MD83C154DCXXX-25P883D 8-BIT, MROM, 25 MHz, MICROCONTROLLER, CDIP40
相關代理商/技術參數
參數描述
S80C32-L16 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
S80C32-L16R 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
S80C376CB8 WAF 制造商:Intel 功能描述:
S80C42 制造商:Intel 功能描述:
S80C51 WAF 制造商:Intel 功能描述:
發(fā)布緊急采購，3分鐘左右您將得到回復。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*