Monday, April 16, 2012
PIN CONFIGURATION OF INTEL 8085
A8-A15
(OUTPUT): These are address lines. They form the address bus. They carry 8 MSBs of
memory address or 8 bits of I/O address.
AD0-AD7
(INPUT/OUTPUT): These are address/data lines. They form
time-multiplexed address/data bus, i.e., they serve dual purpose. They carry 8
LSBs of the memory address or I/O ad-dress during the first clock cycle of a machine
cycle. Again they are used to carry data during the second and third clock
cycle.
ALE
(OUTPUT): It is an address latch enable signal. It goes high during the first
clock cycle of a machine cycle and enables 8 LSBs of address to get latched
into the on-chip latch of peripherals.
IO/M: It is a status
signal to indicate whether the address sent by the microprocessor is for a
memory or an I/O device. When it is high the address on the address bus is for
I/O device and when it is low the address on the address bus is for the memory.
S0 and S1: These are
status signals issued by the microprocessor to identify the various type of
operation.
Thanks Kisan...!
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