17-11-2012, 02:55 PM
Sudhhananda engineering and research center
[attachment=40012]
8O85-MICROPROCESSOR ARCHITECHTURE
The 8085 is an 8-bit general purpose microprocessor that can address 64K Byte of memory.
It has 40 pins and uses +5V for power. It can run at a maximum frequency of 3 MHz.
The pins on the chip can be grouped into 6 groups:
Address Bus.
Data Bus.
Control and Status Signals.
Power supply and frequency.
Externally Initiated Signals.
Serial I/O ports.
Architecture
The total 40 pins are divided into 6 categories,i:e
The 8085 is an 8-bit general purpose microprocessor that can address 64K Byte of memory.
It has 40 pins and uses +5V for power. It can run at a maximum frequency of 3 MHz.
The pins on the chip can be grouped into 6 groups:
Address Bus.
Data Bus.
Control and Status Signals.
Power supply and frequency.
Externally Initiated Signals.
Serial I/O ports.
Control and Status signals
This type of signals are generated form I/O device and memory.
The pin shown in the pin diagram named as ALE(address latch enable).
When ALE=1(high) then the address is latched.
When ALE=0(low) then the data is latched
This by the help of ALE the lower address –data line is demultiplexed.
Interrupts & Externally generated Signals
Interrupts is a request signal which is issued by the I/o device.
Whenever mp is executing a program and I/o device want to access it then it send a request signal to mp to stop the normal exicution.
When the mp recives this request signal then it saves the currentely benig exicuted program in stack memory.
Now mp sends the acknowldgement to the I/o device to access it.
Then after I/O device completing its work then it withdraw its requesting signal.
[attachment=40012]
8O85-MICROPROCESSOR ARCHITECHTURE
The 8085 is an 8-bit general purpose microprocessor that can address 64K Byte of memory.
It has 40 pins and uses +5V for power. It can run at a maximum frequency of 3 MHz.
The pins on the chip can be grouped into 6 groups:
Address Bus.
Data Bus.
Control and Status Signals.
Power supply and frequency.
Externally Initiated Signals.
Serial I/O ports.
Architecture
The total 40 pins are divided into 6 categories,i:e
The 8085 is an 8-bit general purpose microprocessor that can address 64K Byte of memory.
It has 40 pins and uses +5V for power. It can run at a maximum frequency of 3 MHz.
The pins on the chip can be grouped into 6 groups:
Address Bus.
Data Bus.
Control and Status Signals.
Power supply and frequency.
Externally Initiated Signals.
Serial I/O ports.
Control and Status signals
This type of signals are generated form I/O device and memory.
The pin shown in the pin diagram named as ALE(address latch enable).
When ALE=1(high) then the address is latched.
When ALE=0(low) then the data is latched
This by the help of ALE the lower address –data line is demultiplexed.
Interrupts & Externally generated Signals
Interrupts is a request signal which is issued by the I/o device.
Whenever mp is executing a program and I/o device want to access it then it send a request signal to mp to stop the normal exicution.
When the mp recives this request signal then it saves the currentely benig exicuted program in stack memory.
Now mp sends the acknowldgement to the I/o device to access it.
Then after I/O device completing its work then it withdraw its requesting signal.