參數(shù)資料
型號(hào): AT89C51ID2-RLTIM
廠商: Atmel
文件頁數(shù): 28/157頁
文件大?。?/td> 0K
描述: IC 8051 MCU FLASH 64K 44VQFP
標(biāo)準(zhǔn)包裝: 160
系列: 89C
核心處理器: 8051
芯體尺寸: 8-位
速度: 60MHz
連通性: I²C,SPI,UART/USART
外圍設(shè)備: POR,PWM,WDT
輸入/輸出數(shù): 34
程序存儲(chǔ)器容量: 64KB(64K x 8)
程序存儲(chǔ)器類型: 閃存
EEPROM 大?。?/td> 2K x 8
RAM 容量: 2K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 5.5 V
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-LQFP
包裝: 托盤
123
AT89C51ID2
4289C–8051–11/05
Bootloader Functionality
Introduction
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 condi-
tions 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 48).
Figure 48. Hardware conditions typical sequence during power-on.
The on-chip bootloader boot process is shown Figure 49
VCC
PSEN
RST
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 => Boot loader execution.
BLJB = 1 => Application execution
The BLJB is a fuse bit in the Hardware Byte.
That can be modified by hardware (programmer) or by software (API).
Note:
The BLJB test is perform by hardware to prevent any program
execution..
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