Microprocessor | 8085 Ppt By Gaonkar

This is a technical "quirk" of the 8085 that Gaonkar explains very well.

Bidirectional; transfers data between the CPU and memory/IO. Multiplexing: The lower 8 bits of the address bus ( ) are multiplexed with the data bus ( ) to save pins, controlled by the ALE (Address Latch Enable) Vardhaman College of Engineering Slide 6: Addressing Modes Gaonkar classifies 8085 instructions into five modes: Immediate: Data is part of the instruction (e.g., MVI A, 05H Data is moved between registers (e.g., Address is specified in the instruction (e.g., Data is pointed to by a register pair (e.g., Implied/Implicit: The operand is hidden in the opcode (e.g., - Complement Accumulator). Slide 7: Interrupts Hardware Interrupts: Highest priority, non-maskable. RST 7.5, 6.5, 5.5: Vectored and maskable. General purpose, maskable. Software Interrupts: RST 0 through RST 7. Slide 8: Serial I/O Control Uses two dedicated pins for serial communication: SID (Serial Input Data): Read using the instruction. SOD (Serial Output Data): Set using the instruction. GeeksforGeeks UNIT I – 8085 MICROPROCESSOR microprocessor 8085 ppt by gaonkar