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  • bit addressable registers in 8251 mircocontroller

    elamparithi

    elamparithi

    @elamparithi-lu4sGn
    Updated: Oct 26, 2024
    Views: 1.1K
    please tell about the bit addressable registers in 8251 mircocontroller..........i cant even understand the meaning or definition i searched the web..but i didnt get the answers😔....please tell wat is the basic thing behind the bit addressable registers...😕
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  • Kaustubh Katdare

    Administrator • Nov 10, 2009

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  • Mahesh Dahale

    Member • Nov 10, 2009

    Bit-addressable registers are registers that its bits can be modified individually. that means if you have register named "ACC" that is bit addressable , you can change its bits (D0 -D7) individually by special instructions SETB and CLR.

    ex: SETB ACC.3 ; will set bit number 4 (remember bit 0) in the register

    in 8051 there are many bit-addressable registers such as A (ACC), B, SCON, PCON, TCON, p0,p1,p2,p3 .

    Source: net
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  • elamparithi

    Member • Nov 11, 2009

    mahesh_dahale
    Bit-addressable registers are registers that its bits can be modified individually. that means if you have register named "ACC" that is bit addressable , you can change its bits (D0 -D7) individually by special instructions SETB and CLR.

    ex: SETB ACC.3 ; will set bit number 4 (remember bit 0) in the register

    in 8051 there are many bit-addressable registers such as A (ACC), B, SCON, PCON, TCON, p0,p1,p2,p3 .

    Source: net
    Thank u very much for your reply...but if i change the bit value in a register.... what happens to the contents of the registers... ?????
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  • shreya_rulz

    Member • Nov 15, 2009

    If you change the value of any bit in a register then the contents change to the new value that you have given..the only difference between usual registers and bit addressable ones is that you can access and modify the contents bit -wise for bit addressable ones.you dont have to change the value of the whole register to change value of a single bit.
    like if you want to change the value of ACC to say 08h then it is sufficient to write
    SETB ACC.3
    instead of
    MOV ACC,#08H
    Hope this helps...If you have any further queries please let me know..
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