4. MICROPROCESSOR
With the advancement of
microelectronics technology, it become
possible to integrate ALU, control
circuits & memory on a single silicon
chip. This IC chip is called
microprocessor.
MICROPROCESSOR 4
7. • The 8085 is an 8-bit general purpose
microprocessor that can address
216
=64K Byte of memory.
• It has 40 pins and uses +5V for power.
It can run at a maximum frequency of
3 MHz.
MICROPROCESSOR 7
18. ADDRESS BUS
8085 has 16 signal lines that are used as
address bus; however, these lines are
split into two segments: and
MICROPROCESSOR
815 AA −
07 ADAD −
18
19. CONTROL & STATUS
SIGNALS
MICROPROCESSOR
This gp. of signals includes two control
signals ( and ), three status
signals(IO/ , and ) to identify the
nature of the operation and one special
signal (ALE) to indicate the beginning of
the operation.
RD WR
0S
M 1S 0S
19
20. POWER SUPPLY AND
CLOCK FREQUENCY
The power supply and frequency signals
are as follows :-
CLK(OUT)
MICROPROCESSOR
CCV
SSV
21andXX
20