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The data bus and the low order address bus on the 8085 microprocessor are multiplexed with each other. This allows 8 pins to be used where 16 would normally be required. The hardware interface is required to demultiplex the bus by latching the low order address in the first T cycle, on the falling edge of ALE.
The address bus is multiplexed in 8085. The multiplexing is done with the help of ALE signal. ALE stands for ''address latch enable''.
When ALE is High (Logic 1) : Upper address lines (line 15-8) and Lower address lines (line 7-0) combinely holds the 16 bits of the address.
When ALE is Low (Logic 0) : Upper address lines (line 15-8) holds the upper 8 bit address & Lower address lines (line 7-0) holds the "8 bit DATA"
Address/data multiplexing is done on the 8085 microprocessor to reduce the number of pins required for the IC. 16 pins are shared by 8, with the overhead of the ALE pin, so this saves 7 pins.
To save pin count on the chip.
The data and address bus are multiplexed in the 8085 to reduce the pin count of the chip. 8 pins are saved, at the cost of one (ALE).
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8085 is a microprocessor designed by Intel
The '8085' in the 8085 microprocessor is the designation given to the microprocessor by Intel. The '5' means it is a single power supply (5 volt) version of the 8080, with enhancements.
+5v necessary for microprocessor 8085.
8085 is a 8 bit microprocessor designed by Intel Co.
with neat diagram explain the system bus structure of 8085
for demultiplexing address/data bus
crystal is a oscilltor in microprocessor
The 8085 is not pipelined.
program to find prime number in 8085 microprocessor
+5v supply is alone needed for Intel 8085 Microprocessor
HL is a register pair used to store 16 bit of data in 8085 microprocessor.
There are 74 instructions in the 8085 microprocessor.