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T89C51RD2-3CWC-M Datasheet(PDF) 57 Page - ATMEL Corporation

Part # T89C51RD2-3CWC-M
Description  0 to 40MHz Flash Programmable 8-bit Microcontroller
PDF  86 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

T89C51RD2-3CWC-M Datasheet(HTML) 57 Page - ATMEL Corporation

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57
Rev. F - 15 February, 2001
T89C51RD2
Boot process summary
The boot process is summarized on the following flowchart:
Figure 21. Boot process flowchart
CUSTOM BOOT
LOADER
- BSB: Boot Status Byte
- BLJB: Boot Loader Jump Bit (Hardware Bit set to
0 by default)
Jump to FC00h
DEFAULT BOOT
LOADER
Jump to 0000h
USER APPLICATION
Jump to XX00h
BLJB = 1
?
Software
Boot Vector ?
BSB ?
Hardware
Conditions
?
Yes (
PSEN =0, EA =1, and ALE =1 or not connected)
Yes
BSB= 0
SBV= FCh
SBV
FCh
≠
XXh
=
No
Hardware
Software
Reset Falling Edge
Jump to FC03h
No
BSB
00h
≠



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