T89C51RD2-3CTC-M View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
'T89C51RD2-3CTC-M' PDF : 86 Pages View PDF
T89C51RD2
Boot process summary
The boot process is summarized on the following flowchart:
Reset Falling Edge
Hardware
Conditions
?
Yes (PSEN =0, EA =1, and ALE =1 or not connected)
No
Yes
BLJB = 1
?
Hardware
No
Jump to FC03h
Software
BSB ?
BSB= 0
BSB ≠ 00h
Software
Boot Vector ?
SBV= FCh
SBV ≠ FCh = XXh
Jump to XX00h
CUSTOM BOOT
LOADER
Jump to 0000h
USER APPLICATION
Jump to FC00h
DEFAULT BOOT
LOADER
- BSB: Boot Status Byte
- BLJB: Boot Loader Jump Bit (Hardware Bit set to
0 by default)
Figure 21. Boot process flowchart
57
Rev. F - 15 February, 2001
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