Example: ADD B (Add B to Accumulator), ANA C (Logical AND C with Accumulator). Branching Instructions These alter the flow of the program. Example: JMP 2000H (Jump to address 2000H), CALL , and RET . Interfacing and Applications
The 8085 remains the perfect "sandbox" for students to understand how a CPU thinks before moving on to complex 64-bit architectures.
The 8085 features five hardware interrupts, ranked by priority: TRAP (Highest priority, non-maskable) INTR (Lowest priority) Instruction Set and Addressing Modes microprocessor 8085 ppt by gaonkar
These move data between registers or between memory and registers. Example: MOV A, B (Move content of B to A). Arithmetic and Logical Instructions Used for calculations and bitwise manipulation.
The ALU performs all numerical and logical operations. These include addition, subtraction, AND, OR, and XOR. It uses data from the Accumulator and temporary registers to generate results. Example: ADD B (Add B to Accumulator), ANA
The 8085 has five status flags that reflect the result of an ALU operation: Sign (S): Set if the result is negative. Zero (Z): Set if the result is zero. Auxiliary Carry (AC): Used for BCD arithmetic. Parity (P): Set if the result has an even number of 1s. Carry (CY): Set if an operation results in a carry-out. Pin Configuration and Signals
The power of the 8085 lies in its ability to interact with the outside world. Memory Interfacing Interfacing and Applications The 8085 remains the perfect
AD0–AD7: Multiplexed address/data lines. This saves pins by using the same lines for the lower 8 bits of the address and the 8-bit data. A8–A15: Higher-order address lines. Control and Status Signals
The 8085 is housed in a 40-pin DIP package. Understanding these pins is crucial for interfacing. Address and Data Bus