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what is a BANK in 16f84

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ywzslm

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pic16f84 banka bankb

i cannt understand BANK meaning is there anyone explain or how can we change?why do we need this and why do we change this? help me
 

A bank is equivalent to a page

(Typical Memory Layout limited by addresses):
Bank A Selected
Code: 
___________________________________________________________
[   Memory 0-A   ][  Memory 0-B  ][   Memory 0-C   ][   Memory 0-D   ]
[   Memory 1-A   ]
[   Memory 2-A   ]
[   Memory 3-A   ]
[   Memory 4-A   ]
___________________________________________________________
Bank B Selected
Code: 
[   Memory 0-A   ][   Memory 0-B   ][   Memory 0-C   ][   Memory 0-D   ]
                  [   Memory 1-A   ]
                  [   Memory 2-A   ]
                  [   Memory 3-A   ]
                  [   Memory 4-A   ]
___________________________________________________________
Bank C Selected
Code: 
[   Memory 0-A   ][   Memory 0-B   ][   Memory 0-C   ][   Memory 0-D   ]
                                    [   Memory 1-A   ]
                                    [   Memory 2-A   ]
                                    [   Memory 3-A   ]
                                    [   Memory 4-A   ]
___________________________________________________________
Bank D Selected
Code: 
[   Memory 0-A   ][   Memory 0-B   ][   Memory 0-C   ][   Memory 0-D   ]
                                                      [   Memory 1-A   ]
                                                      [   Memory 2-A   ]
                                                      [   Memory 3-A   ]
                                                      [   Memory 4-A   ]
___________________________________________________________

I am sorry I cannot find a good example in Google images.

Banks/pages allow you to Address much more data then is typically available.
 

In able for you to understand on what is the BANK do, just read the datasheet of the PIC16F84. You also see there on how to shift from bank0 to bank1 and vice versa.
 

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