Memory capacity , Calculation method of start address or end address



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Learning objectives ：

Memory capacity , Calculation method of start address or end address

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Learning content ：

Memory is addressed in bytes , So the unit is bytes （byte,bytes）,1 Bytes are equal to 8 position （bit） of .

Because the scope of calculation is generally small , So just remember two .

Remember a few common 2 of 10 The power is 1024 Namely 1KB
12bit-->2^12=4096byte,

G representative 2^10 x 2^10 x2^10 = 2^30.

formula :
     Memory capacity = End address - First address +1

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How to calculate with a calculator ：

（1） Turn on the calculator on your computer

（2） Show with pictures

  Click the in the upper left corner “ three ” Find programmer （programer）

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Learning output ：

Take examples as evidence ：

（1）

Capacity 4K

4K*8bit = 4KB Namely 2 Square times 2 of 10 Power ,2 of 12 Power ,12/4=3（ Turn into 16 Base system ） Namely 1000H

01000H= End address -6800H+1H

End address =01000H+6800H-1H

  End address =077FFH

（2）SRAM Start from 20000000H, Capacity 20kBytes, Calculation end address

20*1024=20480————=5000H

5000H=?-20000000+1

?=20004FFF

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