Pins 12-19 handle both the lower 8 bits of the address and the 8 bits of data. The ALE (Address Latch Enable) signal de-multiplexes these lines.
Execute Boolean operations, compares, and rotations (e.g., ANA , ORA , XRA , CMP , RLC ).
Indicates that data on the data bus is to be written into the selected memory or I/O location.
The CPU reads the instruction opcode from memory. microprocessor 8085 ppt by gaonkar free
Every instruction begins with an Opcode Fetch. It typically requires 4 T-states:
For students looking to download ready-made presentation files that directly adapt Ramesh Gaonkar's text, several educational databases provide free slide decks.
The 8085 is housed in a 40-pin Dual In-line Package (DIP). Understanding the pinout is crucial for hardware interfacing layout slides. Pins 12-19 handle both the lower 8 bits
Gaonkar’s approach categorizes 8085 instructions into five functional groups:
+----+---U---+----+ X1 --| 1 40 |-- Vcc (+5V) X2 --| 2 39 |-- HOLD RESET OUT | 3 38 |-- HLDA SOD --| 4 37 |-- CLK (OUT) SID --| 5 36 |-- RESET IN TRAP --| 6 35 |-- READY RST 7.5 | 7 34 |-- IO/M RST 6.5 | 8 33 |-- S1 RST 5.5 | 9 32 |-- RD INTR --| 10 31 |-- WR INTA --| 11 30 |-- ALE AD0 --| 12 29 |-- S0 AD1 --| 13 28 |-- A15 AD2 --| 14 27 |-- A14 AD3 --| 15 26 |-- A13 AD4 --| 16 25 |-- A12 AD5 --| 17 24 |-- A11 AD6 --| 18 23 |-- A10 AD7 --| 19 22 |-- A9 Vss --| 20 21 |-- A8 +-----------------+ Address and Data Buses
Template: LDA 2500H (Load Accumulator directly with data from memory address 2500H). Indicates that data on the data bus is
– A clear image showing the 40-pin DIP layout.
Gaonkar categorizes the 8085 instruction set into five clear functional categories:
Microprocessor Architecture, Programming, and Applications with the 8085 ," through the following educational platforms: