AT89C51RC2 Atmel Corporation, AT89C51RC2 Datasheet - Page 94
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AT89C51RC2
Manufacturer Part Number
AT89C51RC2
Description
Manufacturer
Atmel Corporation
Specifications of AT89C51RC2
Flash (kbytes)
32 Kbytes
Max. Operating Frequency
60 MHz
Cpu
8051-12C
Max I/o Pins
32
Spi
1
Uart
1
Sram (kbytes)
1.25
Self Program Memory
API
Operating Voltage (vcc)
2.7 to 5.5
Timers
4
Isp
UART
Watchdog
Yes
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Company
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Manufacturer
Quantity
Price
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Part Number:
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Part Number:
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Manufacturer:
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Boot Process
Figure 39. Bootloader process
94
AT89C51RB2/RC2
USER APPLICATION
PC = 0000h
ENBOOT = 0
BLJB = 1
USER BOOT LOADER
PC= [SBV]00h
BSB = 00h
SBV = FCh
FCON = 00h
Condition?
Hardware
BLJB!= 0
RESET
?
?
?
?
F800h
If BLJB = 0 then ENBOOT bit (AUXR1) is set
BLJB = 0
ENBOOT = 1
FCON = F0h
Yes (PSEN = 0, EA = 1, and ALE = 1 or not connected)
FCON = 00h
yes = hardware boot
else ENBOOT bit (AUXR1) is cleared
Atmel BOOT LOADER
conditions
4180E–8051–10/06