參數資料
型號: ATWEBDVK-02WC
廠商: Atmel
文件頁數: 3/137頁
文件大?。?/td> 0K
描述: KIT DEV TCP/IP AT89C51RD2 WEBCAM
標準包裝: 1
系列: @Web
主要目的: *
嵌入式: *
已用 IC / 零件: AT89C51RD2
主要屬性: *
次要屬性: *
已供物品: 板,帶網絡 Webcam 模塊和軟件
產品目錄頁面: 617 (CN2011-ZH PDF)
100
4235K–8051–05/08
AT89C51RD2/ED2
24.6.4
Bootloader Functionality
The bootloader can be activated by two means: Hardware conditions or regular boot process.
The Hardware conditions (EA = 1, PSEN = 0) during the Reset# falling edge force the on-chip
bootloader execution. This allows an application to be built that will normally execute the end
user’s code but can be manually forced into default ISP operation.
As PSEN is a an output port in normal operating mode after reset, user application should take
care to release PSEN after falling edge of reset signal. The hardware conditions are sampled at
reset signal falling edge, thus they can be released at any time when reset input is low.
To ensure correct microcontroller startup, the PSEN pin should not be tied to ground during
power-on (See Figure 24-4).
Figure 24-4. Hardware conditions typical sequence during power-on.
The on-chip bootloader boot process is shown Figure 24-5.
VCC
PSEN
RST
Table 24-6.
Bootloader Process Description
Purpose
Hardware Conditions
The Hardware Conditions force the bootloader execution whatever BLJB,
BSB and SBV values.
BLJB
The Boot Loader Jump Bit forces the application execution.
BLJB = 0 => Bootloader execution
BLJB = 1 => Application execution
The BLJB is a fuse bit in the Hardware Byte.
It can be modified by hardware (programmer) or by software (API).
Note: The BLJB test is performed by hardware to prevent any program
execution.
SBV
The Software Boot Vector contains the high address of customer bootloader
stored in the application.
SBV = FCh (default value) if no customer bootloader in user Flash.
Note: The customer bootloader is called by JMP [SBV]00h instruction.
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ATWEBEVK-01 功能描述:KIT EVAL TCP/IP AT89C51AC2 RoHS:否 類別:編程器,開發(fā)系統(tǒng) >> 評估演示板和套件 系列:@Web 產品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:- 主要目的:電源管理,電池充電器 嵌入式:否 已用 IC / 零件:MAX8903A 主要屬性:1 芯鋰離子電池 次要屬性:狀態(tài) LED 已供物品:板
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