Microprocessor 8085 Ppt By Gaonkar New -

+-------------------------------------------------------+ | 8085 MICROPROCESSOR | +-------------------------------------------------------+ | [ALU] <=======> [Accumulator] <====> [Temp Register] | | || | | [Flags Register] | | || | | [Register Array] || | | B - C || [Instruction Decoder] | | D - E || || | | H - L || [Timing & Control Unit] | | || || | | [Stack Pointer] || || | | [Program Counter] || || | +---------------------||----------||--------------------+ || || ======================[ Multiplexed Data/Address Bus ]========= 1. The ALU (Arithmetic and Logic Unit)

: One subdivision of an operation corresponding to one internal clock period.

TRAP cannot be disabled by software, making it critical for emergency routines like power-failure handlers. Maskable interrupts can be enabled or disabled using the EI (Enable Interrupt) and DI (Disable Interrupt) instructions. microprocessor 8085 ppt by gaonkar new

Title Slide (Topic, presenter name, and reference to Ramesh Gaonkar's textbook)

Operates typically at 3 MHz (using a 6 MHz crystal oscillator) Maskable interrupts can be enabled or disabled using

: MOV , MVI , LXI , LDA , STA . (Moves data; no flags are affected). Arithmetic : ADD , SUB , INR , DCR . (Alters status flags). Logical : ANA , ORA , XRA , CMP , CMA .

Interrupts are signals sent by external devices to get CPU attention. The 8085 has five hardware interrupts ranked by priority: Highest priority, non-maskable (cannot be ignored). RST 7.5: Vectored, maskable interrupt. RST 6.5: Vectored, maskable interrupt. RST 5.5: Vectored, maskable interrupt. INTR: Lowest priority, non-vectored interrupt. Tips for Creating Your Gaonkar 8085 PPT Arithmetic : ADD , SUB , INR , DCR

A 16-bit register that stores the memory address of the next instruction waiting to be fetched and executed.