#Microprocessor, #Pindiagram, Pin diagram of 8085 Microprocessor lectures in Tamil, Easy tricks
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#Microprocessor,
#Microprocessor, #Pindiagram, #Kilinjal
In this video we explained how to remember pin Configuration easily.
After watching this video you can absolutely write down the pin Configuration
Pin diagram of 8085 Microprocessor
It is a 40 pin IC with a DIP(Dual Inline Package) and it is a 5v only processor.
Pin no.40: VCC ---- Supply +5V is connected
Pin no.20: VSS -----Ground reference
Pin no. 1 and 2: --------- X1 and used to connect the crystal oscillator for generating the clock pulse
Pin no. 12 to 19: -----Multiplexed address/data bus AD0 to AD7. This contains lower byte of the address lines and data lines. These lines can be de-multiplexed with the help of ALE signal
Pin no. 30 ALE (Address Latch Enable):
When ALE=1: Pin no. 12 to 19 act as address bus
When ALE =0: Pin no. 12 to 19 act as data bus
Pin no 21 to 28: Higher order address lines
Pin no. 31: RD
This is an active low signal
Used to read data from peripheral unit to Microprocessor
PIN no. 32: WR
This is an active low signal
Used to write data from microprocessor to peripheral unit.
Status signsls: s0, s1, io/m
S0--- pin no. 29
S1----pin no. 33
Io/m----pin no. 34
These status signals are either set or reset according to the operations performed by the microprocessor. The respective tabular column is given in the video.
Interrupts:
Interrupts are the external signals which disturbs the normal execution of the microprocessor.
There are five interrupt signals present in 8085. They are
Trap---------pin no. 6
Rst 7.5-----pin no. 7
Rst 6.5-----pin no. 8
Rst 5.5-----pin no. 9
Intr-----------pin no. 10
When these interrupt occurs, after completing the current instruction, the microprocessor stop executing the main program and the program control is transferred to ISS(interrupt service subroutine ). After completing the ISS, the program control is transferred to the main program.
Details of each interrupts are given in the forms of tabular column in the video.
INTA. pin no. 11:
INTA=interrupt acknowledgement signal
This signal is used to indicate whether the interrupt request coming from the external
device is accepted by the microprocessor or not.
This is the active low signal which means if the signal is low the interrupt request is accepted by the microprocessor.
Serial communication:
This is used to transfer data bit by bit between the microprocessor and the external device.
There are two pins used for this.
SID. Pin No. 5:
Serial Input Data. Used to transfer data from external device to the microprocessor bit by bit.
SOD. Pin No. 4:
Serial Output Data. Used to transfer data from microprocessor to external device bit by bit.
HOLD. Pin no. 39
This is the request given from other device to use the address bus and data bus of the microprocessor.
HLDA. Pin no. 38
This is the response given by the microprocessor to the HOLD signal.
CLKOUT. Pin no. 37
Used as the system clock for devices connected with the microprocessor.
RESET IN. Pin no. 36
This is the active low signal.
Used to reset the microprocessor.
RESETOUT. Pin no. 3
Used to reset all devices connected with the microprocessor.
In this video we explained how to remember pin Configuration easily.
After watching this video you can absolutely write down the pin Configuration
Pin diagram of 8085 Microprocessor
It is a 40 pin IC with a DIP(Dual Inline Package) and it is a 5v only processor.
Pin no.40: VCC ---- Supply +5V is connected
Pin no.20: VSS -----Ground reference
Pin no. 1 and 2: --------- X1 and used to connect the crystal oscillator for generating the clock pulse
Pin no. 12 to 19: -----Multiplexed address/data bus AD0 to AD7. This contains lower byte of the address lines and data lines. These lines can be de-multiplexed with the help of ALE signal
Pin no. 30 ALE (Address Latch Enable):
When ALE=1: Pin no. 12 to 19 act as address bus
When ALE =0: Pin no. 12 to 19 act as data bus
Pin no 21 to 28: Higher order address lines
Pin no. 31: RD
This is an active low signal
Used to read data from peripheral unit to Microprocessor
PIN no. 32: WR
This is an active low signal
Used to write data from microprocessor to peripheral unit.
Status signsls: s0, s1, io/m
S0--- pin no. 29
S1----pin no. 33
Io/m----pin no. 34
These status signals are either set or reset according to the operations performed by the microprocessor. The respective tabular column is given in the video.
Interrupts:
Interrupts are the external signals which disturbs the normal execution of the microprocessor.
There are five interrupt signals present in 8085. They are
Trap---------pin no. 6
Rst 7.5-----pin no. 7
Rst 6.5-----pin no. 8
Rst 5.5-----pin no. 9
Intr-----------pin no. 10
When these interrupt occurs, after completing the current instruction, the microprocessor stop executing the main program and the program control is transferred to ISS(interrupt service subroutine ). After completing the ISS, the program control is transferred to the main program.
Details of each interrupts are given in the forms of tabular column in the video.
INTA. pin no. 11:
INTA=interrupt acknowledgement signal
This signal is used to indicate whether the interrupt request coming from the external
device is accepted by the microprocessor or not.
This is the active low signal which means if the signal is low the interrupt request is accepted by the microprocessor.
Serial communication:
This is used to transfer data bit by bit between the microprocessor and the external device.
There are two pins used for this.
SID. Pin No. 5:
Serial Input Data. Used to transfer data from external device to the microprocessor bit by bit.
SOD. Pin No. 4:
Serial Output Data. Used to transfer data from microprocessor to external device bit by bit.
HOLD. Pin no. 39
This is the request given from other device to use the address bus and data bus of the microprocessor.
HLDA. Pin no. 38
This is the response given by the microprocessor to the HOLD signal.
CLKOUT. Pin no. 37
Used as the system clock for devices connected with the microprocessor.
RESET IN. Pin no. 36
This is the active low signal.
Used to reset the microprocessor.
RESETOUT. Pin no. 3
Used to reset all devices connected with the microprocessor.
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