Introduction to Microprocessors 8085
8085 is a well-known microprocessor developed by Intel 8-bit. It came in 1977. This microprocessor has become very popular. Even today, many colleges are taught about this for the purpose of providing initial information on the microprocessor. Its predecessor was used in 8080 microprocessors and computers operating with processor CP / M logistics. The i8085 was later used in the same way as microcontroller because it used to work with adding fewer components (IC etc). The situation had changed in the event of the introduction of a Zilog Z80, and now its Z80 used to be used in computers and the use of 8085 computers was greatly reduced. But its use continued for many days.
The microprocessor performs three main tasks for the computer system:
1. data transfer between itself and the memory or I/O system.
2. simple arithmetic and logic operations and
3. program flow via simple decisions. Albeit these are simple tasks, but through them, the power of the microprocessor is in its ability to execute millions of instruction per second from a program or software stored in the Memory System.
Pin Definitions of 8085
The 8085 is the 3rd generation up, using NMOS technology in a 40 pin DIP.
It requires a single battery of +5v DC. the signals of 8085 can be classified into seven groups.
1. Power supply and frequency signals
2. The data bus and Address bus
3. Control bus
4. Interrupt signals
5. Serial I/O signals
6. SMA signals
7. Reset signals
Power Supply and Frequency Signals
1.Vcc: It requires a single +5v power supply
2. Vss: Ground reference
3. X1 and x2: A crystal oscillator is connected at these two pins,
The internal clock Frequency or operating frequency is half of the oscillator frequency. therefore to operate a system at 3 MHz,
the crystal of tuned circuit must have a frequency of 6 MHz.
Data Bus and Address Bus
1. AD0 to AD7: The 8-bit data bus (D0-D7) is multiplexed with the lower half (A0-A7) of the 16-bits address bus. During the first part of the machine cycle (Ti) lower 8-bits of a memory address or I/O address appear on the bus.
2. A8 to A15: The upper half of the 16-bit address appears on the address line A8 to A15. These lines are excessively used for most significant 8-bits of the 16 - bits address line.
8085 is a well-known microprocessor developed by Intel 8-bit. It came in 1977. This microprocessor has become very popular. Even today, many colleges are taught about this for the purpose of providing initial information on the microprocessor. Its predecessor was used in 8080 microprocessors and computers operating with processor CP / M logistics. The i8085 was later used in the same way as microcontroller because it used to work with adding fewer components (IC etc). The situation had changed in the event of the introduction of a Zilog Z80, and now its Z80 used to be used in computers and the use of 8085 computers was greatly reduced. But its use continued for many days.
The microprocessor performs three main tasks for the computer system:
1. data transfer between itself and the memory or I/O system.
2. simple arithmetic and logic operations and
3. program flow via simple decisions. Albeit these are simple tasks, but through them, the power of the microprocessor is in its ability to execute millions of instruction per second from a program or software stored in the Memory System.
Pin Definitions of 8085
The 8085 is the 3rd generation up, using NMOS technology in a 40 pin DIP.
It requires a single battery of +5v DC. the signals of 8085 can be classified into seven groups.
1. Power supply and frequency signals
2. The data bus and Address bus
3. Control bus
4. Interrupt signals
5. Serial I/O signals
6. SMA signals
7. Reset signals
Power Supply and Frequency Signals
1.Vcc: It requires a single +5v power supply
2. Vss: Ground reference
3. X1 and x2: A crystal oscillator is connected at these two pins,
The internal clock Frequency or operating frequency is half of the oscillator frequency. therefore to operate a system at 3 MHz,
the crystal of tuned circuit must have a frequency of 6 MHz.
Data Bus and Address Bus
1. AD0 to AD7: The 8-bit data bus (D0-D7) is multiplexed with the lower half (A0-A7) of the 16-bits address bus. During the first part of the machine cycle (Ti) lower 8-bits of a memory address or I/O address appear on the bus.
2. A8 to A15: The upper half of the 16-bit address appears on the address line A8 to A15. These lines are excessively used for most significant 8-bits of the 16 - bits address line.
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