. It alerts external latches (like the 74LS373 IC) to isolate and freeze the lower address bits ( ) from the multiplexed lines.
: Active low signal indicating the microprocessor is writing data. Summary for Presentation Slides
By locating or building a PPT that follows Gaonkar’s structured methodology, you are not just memorizing pins and opcodes. You are learning the fundamental logic that runs every embedded device around you.
Icons representing different functional hardware expansion modules. Key Content:
Set to 1 if the Most Significant Bit (D7) of the result is 1 (negative number). microprocessor 8085 ppt by gaonkar
The Flags register is an 8-bit register containing five active 1-bit flip-flops that indicate the status of the ALU after an operation. Gaonkar emphasizes checking these flags during conditional programming.
The 8085 is an 8-bit, N-channel Metal Oxide Semiconductor (NMOS) processor introduced by Intel in 1976 . : 40-pin IC package.
Addressing modes define how the microprocessor accesses its operands:
: The Program Counter places the 16-bit target address onto the address lines. , latching the lower byte. drops low if reading from memory. T2cap T sub 2 : RD̄modified cap R cap D with bar above Summary for Presentation Slides By locating or building
(primarily used as a memory pointer, designated as 'M' in instructions) Special-Purpose 16-Bit Registers
The 8085 is housed in a 40-pin Dual In-line Package (DIP). Understanding the pinout is crucial for interfacing design. The Three-Bus System Address Bus (Pins
: AND, OR, XOR, and compare operations (e.g., ANA , ORA , CMP ).
A high-resolution image of the Intel 8085 40-pin DIP chip alongside a block diagram preview. Key Content: Key Content: Set to 1 if the Most
A high-priority, maskable, edge-triggered interrupt. Vectored to RST 6.5: A maskable, level-triggered interrupt. Vectored to RST 5.5: A maskable, level-triggered interrupt. Vectored to
The power of the 8085 lies in its ability to interact with the outside world. Memory Interfacing
The time needed to complete one basic access operation with memory or an I/O device (e.g., Opcode Fetch, Memory Read, Memory Write). An instruction cycle consists of 1 to 5 machine cycles.
Uses an 8-bit independent address space isolated from memory. Uses dedicated IN and OUT instructions to communicate over 256 unique I/O ports.
An internal 8-bit register used by the ALU to hold operands during execution (not accessible to the programmer). Slide 4: The 8085 Register Structure Slide Title: Programmer's Matrix and Register Organization
(e.g., connecting the 8085 to 8259 or 8254) EEE226 - School of Electrical and Electronic Engineering