Pin Layout of Intel 486 Microprocessor 1. CLOCK, Symbol : CLK and Type : Input :- CLK provides the fundamental timing and the internal operating frequency for the Intel486 microprocessor. All external timing parameters are specified with respect to the rising edge of CLK. The Intel486 microprocessor can operate over a wide frequency range but CLK's frequency cannot change rapidly while RESET pin is Inactive. CLK's frequency must be stable for proper chip operation since a single edge CLK is used internally to generate two phases. CLK only needs TTL levels for proper operation. 2. ADDRESS BUS, Symbol : A31-A4 and Type : Input-Output, Symbol : A2-A3 and Type : Output :- A31-A2 are the address lines of the microprocessor. A31-A2, together with the byte enables BE0#-BE3# , define the physical area of memory or input/output space accessed. Address lines A31-A4 are used to drive addresses into the microprocessor to pe...
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