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Architecture of 8085 Microprocessor V. Mahalakshmi
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| Date | 07.04.2021 | | Size | 433.3 Kb. | | #56259 |
| Architecture of 8085 V.Mahalakshmi TTS 3061 1154EC106- Basics of Embedded System Features of 8085 Microprocessor - 8 bit general purpose microprocessor.
- It has 40 pins (dip) dual in line package.
- Capable of addressing 64K of memory.
- It requires+5V power supply.
- It can operate with 3Mhz clock.
- It provides 74 instructions.
- It has on chip clock generator.
- 8-bit data bus.
- 16-bit address bus, which can address upto 64KB.
- A 16-bit program counter, stack pointer.
Pin Diagram Architecture of 8085 Intel 8085 Microprocessor Microprocessor consists of: - Control unit: control microprocessor operations.
- ALU: performs data processing function.
- Registers: provide storage internal to CPU.
- Interrupts
- Internal data bus, Address bus
Register sets of 8085 - B, C, D, E, H & L (8 bit regs)
- Can be used singly or can be used as 16 bit register pairs BC, DE, HL.
- H & L can be used as a data pointer (holds memory address)
- Special Purpose Registers
- Accumulator (8 bit register)
Accumulator: Accumulator: - It is a 8-bit register which is used to perform arithmetical and logical operation.
- It stores the output of any operation.
- It also works as registers for i/o accesses.
Temporary Register - It is a 8-bit register which is used to hold the data on which the accumulator is computing operation.
- It is also called as operand register because it provides operands to ALU.
Control signals of 8085 - Arithmetic Latch Enable (ALE)
It is an output signal used to give information of AD0-AD7 contents. High – Address, Low - Data 2.Read (RD) signal This is active low used for reading operation. 3.Write signal (WR) This is active low used for writing operation. Status signals
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