T89C51RD2-3CBC-L ATMEL [ATMEL Corporation], T89C51RD2-3CBC-L Datasheet - Page 57
T89C51RD2-3CBC-L
Manufacturer Part Number
T89C51RD2-3CBC-L
Description
0 to 40MHz Flash Programmable 8-bit Microcontroller
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
1.T89C51RD2-3CBC-L.pdf
(86 pages)
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T89C51RD2
Boot process summary
The boot process is summarized on the following flowchart:
57
Hardware
Software
Reset Falling Edge
Jump to FC03h
Jump to XX00h
CUSTOM BOOT
Software
Boot Vector ?
Conditions
Hardware
BLJB = 1
LOADER
BSB ?
?
?
No
No
BSB 00h
SBV
FCh
Yes (
Yes
BSB= 0
SBV= FCh
PSEN =0, EA =1, and ALE =1 or not connected)
=
XXh
Figure 21. Boot process flowchart
USER APPLICATION
Jump to 0000h
- BSB: Boot Status Byte
- BLJB: Boot Loader Jump Bit (Hardware Bit set to
0 by default)
Jump to FC00h
DEFAULT BOOT
LOADER
Rev. F - 15 February, 2001
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