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Features:• Compatible with MCS-51st products.
• 4 Kbytes of in-system reprogram able flash memory.
• Fully static operation: 0 Hz to 24 MHz.
• Three-level program Memory Lock.
• 128*8-Bit Internal RAM.
• 32 Programmable I/O Lines.
• Two 16-Bit Timer/Counters.
• Six Interrupt sources.
• Programmable Serial Channel.
Idle mode:In idle mode, the CPU puts itself to sleep while all the on chip peripherals remain active. The mode is invoked by software. The content of the on-chip RAM and all the specific functions registers remain unchanged during this mode. The idle mode can be terminated by any enabled interrupt or by a hardware reset. It should be noted that when idle is terminated by a hardware reset, the device normally resumes program execution, from where it left off, up to two machine cycles before the internal reset algorithm takes control. On-chip hardware inhibits access to internal RAM in this event, but access to the port pins is not inhibited. To eliminate the possibility of an unexpected write to a port pin when Idle is terminated by reset, the instruction following the one that invokes Idle should not be one that writes to port pin or to external memory.
In the power –down mode ,the oscillator is stopped ,and the instruction that invokes power –down is the last instruction executed .The on-chip RAM and Special Function Registers retain their values until the power –down mode is terminated. The only exit from power –down is a hard ware reset .Rest redefines the SFRs but does not change the on-chip RAM .The reset should not be activated before VCC is restored to its normal operating level and must be held active long enough to allow the oscillator to restart and stabilize.
CONCLUSION:The “I2C based automated periodic bell” designed using micro controller AT89C51 has found to be useful in several places for accurate alarming. Periodically ringing has been achieved by using modern technology protocol called I2C protocol. In this, communication is successfully achieved between master and slave device. Replacing I2C protocol by SM-bus, CAN and other advanced protocols, better accurate results can be achieved.
Microcontroller’s full capacity can be utilized by adding more controls to the system. The capacity of number of slaves depends up on the communication bus need.
This project can be extended by making the LCD to display not only date, day, time, but also the period that is going on at present, in school, colleges. This can also be used in churches, temples, industries.
WHAT DO WE NEED:
SOLDERING AND ASSEMBLY:
The reason i recommend you to defuse the LED with a sand paper is that after defusion the LED's light will be uniform and will look better , all you have to do is just rub it with sand paper. A small piece will do the job. ITS OPTIONAL THOUGH!
DEFUSE THE LED:
HOW TO CONSTRUCT THE CUBE:
HERE IS THE CODE FOR THE LED CUBE:
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THEORY OF OPERATION OF DESIGN:
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