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Memory Map of 8051 microcontroller

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Memory map of the SFRs:

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The individual bits of TMOD have the following functions:

As you can see in the above chart, four bits (two for each timer) are used to specify a

mode of operation. The modes of operation are:

TCON (88H) SFR

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Interrupt Service Routine Addresses:

Your program may enable and disable interrupts by modifying the IE SFR (A8h):