參數(shù)資料
型號: AT89C51SND2C-7FTUL
廠商: Atmel
文件頁數(shù): 87/160頁
文件大?。?/td> 0K
描述: IC 8051 MCU FLASH 64K MP3 100BGA
標(biāo)準(zhǔn)包裝: 260
系列: 89C
核心處理器: 8051
芯體尺寸: 8-位
速度: 40MHz
連通性: I²C,IDE/ATAPI,MMC,SPI,UART/USART,USB
外圍設(shè)備: 音頻,I²S,MP3,PCM,POR,WDT
輸入/輸出數(shù): 32
程序存儲器容量: 64KB(64K x 8)
程序存儲器類型: 閃存
RAM 容量: 2.25K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 3.3 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 100-TFBGA
包裝: 托盤
其它名稱: AT89C51SND2C7FTUL
21
4341H–MP3–10/07
AT8xC51SND2C/MP3B
6.4.2
Hardware Condition Boot Mapping
The hardware condition is based on the ISP pin. When driving this pin to low level, the chip reset
sets ENBOOT and forces the reset vector to F000h instead of 0000h in order to execute the
boot loader software.
As shown in Figure 6-4 the hardware condition always allows in-system recovery when user’s
memory has been corrupted.
6.4.3
Programmed Condition Boot Mapping
The programmed condition is based on the Boot Loader Jump Bit (BLJB) in HSB. As shown in
Figure 6-4 when this bit is programmed (by hardware or software programming mode), the chip
reset set ENBOOT and forces the reset vector to F000h instead of 0000h, in order to execute
the boot loader software.
Figure 6-4.
Hardware Boot Process Algorithm
The software process (boot loader) is detailed in the “Boot Loader Datasheet” Document.
6.5
Preventing Flash Corruption
See Section “Reset Recommendation to Prevent Flash Corruption”, page 48.
Atmel’s
Boot Loader
H
a
rd
w
a
re
S
o
ft
w
a
re
Hard Cond?
ISP = L?
RESET
Hard Cond Init
ENBOOT = 1
PC = F000h
FCON = 00h
Prog Cond?
BLJB = P?
Standard Init
ENBOOT = 0
PC = 0000h
FCON = F0h
Prog Cond Init
ENBOOT = 1
PC = F000h
FCON = F0h
User’s
Application
P
ro
c
e
s
P
ro
c
e
s
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