鍙冩暩(sh霉)璩囨枡
鍨嬭櫉锛� ATMEGA3250P-20AUR
寤犲晢锛� Atmel
鏂囦欢闋佹暩(sh霉)锛� 175/364闋�
鏂囦欢澶�?銆�?/td> 0K
鎻忚堪锛� MCU AVR 32K FLASH 20MHZ 100TQFP
鐢�(ch菐n)鍝佸煿瑷�(x霉n)妯″锛� megaAVR Introduction
妯�(bi膩o)婧�(zh菙n)鍖呰锛� 1,500
绯诲垪锛� AVR® ATmega
鏍稿績铏曠悊鍣細 AVR
鑺珨灏哄锛� 8-浣�
閫熷害锛� 20MHz
閫i€氭€э細 SPI锛孶ART/USART锛孶SI
澶栧湇瑷�(sh猫)鍌欙細 娆犲妾㈡脯/寰�(f霉)浣�锛孭OR锛孭WM锛學DT
杓稿叆/杓稿嚭鏁�(sh霉)锛� 69
绋嬪簭瀛樺劜鍣ㄥ閲忥細 32KB锛�16K x 16锛�
绋嬪簭瀛樺劜鍣ㄩ鍨嬶細 闁冨瓨
EEPROM 澶�?銆�?/td> 1K x 8
RAM 瀹归噺锛� 2K x 8
闆诲 - 闆绘簮 (Vcc/Vdd)锛� 2.7 V ~ 5.5 V
鏁�(sh霉)鎿�(j霉)杞�(zhu菐n)鎻涘櫒锛� A/D 8x10b
鎸暕鍣ㄥ瀷锛� 鍏�(n猫i)閮�
宸ヤ綔婧害锛� -40°C ~ 85°C
灏佽/澶栨锛� 100-TQFP
鍖呰锛� 甯跺嵎 (TR)
閰嶇敤锛� ATSTK600-RC18-ND - STK600 ROUTING CARD AVR
鍏跺畠鍚嶇ū锛� ATMEGA3250P-20AUR-ND
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256
8023F鈥揂VR鈥�07/09
ATmega325P/3250P
24. Boot Loader Support 鈥� Read-While-Write Self-Programming
24.1
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 25-11 on page 276)
used during programming. The page organization does not affect normal operation.
24.2
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.
24.3
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 24-2). The size of the different sections is configured by the
BOOTSZ Fuses as shown in Table 24-6 on page 268 and Figure 24-2. These two sections can
have different level of protection since they have different sets of Lock bits.
24.3.1
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 24-2 on page 260. The Application section can never store any
Boot Loader code since the SPM instruction is disabled when executed from the Application
section.
24.3.2
BLS 鈥� 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 24-3 on page 260.
鐩搁棞(gu膩n)PDF璩囨枡
PDF鎻忚堪
SC16C554BIB64,128 IC UART QUAD SOT314-2
SCC68692C1N40,602 IC DUART 40DIP
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ATMEGA3250-16AUR MCU AVR 32K FLASH 16MHZ 100TQFP
SC16C654BIB64,157 IC QUAD UART 64BYTE 64LQFP
鐩搁棞(gu膩n)浠g悊鍟�/鎶€琛�(sh霉)鍙冩暩(sh霉)
鍙冩暩(sh霉)鎻忚堪
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