An instruction lifecycle consists of three nested time units: , Machine Cycles , and Instruction Cycles .
This structure is information-dense but visually clear—the hallmark of a modernized educational slide.
+-------------------------------------------------------------------------------+ | INTERNAL ARCHITECTURE | | +---------------------------+ +------------------------------+ | | | INTERRUPT CONTROL | | SERIAL I/O CONTROL | | | | | | | | | | TRAP, RST 7.5, RST 6.5, | | SID (Serial Input Data) | | | | RST 5.5, INTR | | SOD (Serial Output Data) | | | +------------+--------------+ +--------------+---------------+ | | | | | | +------------v--------------+ +--------------v---------------+ | | | | | | | | | 8-BIT INTERNAL DATA BUS (DBUS) | | | | | | | +------------+--------------+ +--------------+---------------+ | | | | | | +------------v--------------+ +--------------v---------------+ | | | | | | | | | ACCUMULATOR (A) | | TEMPORARY REGISTER (TEMP) | | | | 8-bit | | 8-bit | | | +------------+--------------+ +--------------+---------------+ | | | | | | +----------------+----------------+ | | | | | +----------v----------+ | | | ALU (Arithmetic | | | | and Logic Unit) | | | +----------+----------+ | | | | | +----------v----------+ | | | FLAG REGISTER | | | | (Status Flags) | | | | S Z AC P CY | | | +---------------------+ | | | | +---------------------------+ +------------------------------+ | | | REGISTER ARRAY | | INSTRUCTION REGISTER (IR) | | | | | | | | | | B Register C Register | | INSTRUCTION DECODER | | | | D Register E Register | | & MACHINE CYCLE | | | | H Register L Register | | ENCODING | | | | | | | | | | STACK POINTER (SP) | +--------------+---------------+ | | | PROGRAM COUNTER (PC) | | | | | | | | | +-----------+--------------++ | | | | | | | +-----------v--------------+ +---------------v-------------+ | | | INCREMENTER/ | | TIMING AND CONTROL | | | | DECREMENTER ADDRESS | | CIRCUITRY | | | | LATCH | | | | | +-----------+--------------+ +---------------+-------------+ | | | | | | +-----------v--------------+ +---------------v-------------+ | | | ADDRESS BUFFER | | ADDRESS/DATA BUFFER | | | | (A15 - A8) | | (AD7 - AD0) | | | +--------------------------+ +-----------------------------+ | +-------------------------------------------------------------------------------+ | EXTERNAL PINS & SIGNALS | | +-----------------------------------------------------------------------+ | | | Address Bus (A15-A8) | Address/Data Bus (AD7-AD0) | Control Signals | | | +-----------------------------------------------------------------------+ | +-------------------------------------------------------------------------------+
The 8085 is an 8-bit general-purpose microprocessor introduced by Intel in 1976. Gaonkar’s approach emphasizes that the 8085 is a programmable device that processes binary numbers according to instructions stored in memory. Slideshare Word Size: Clock Speed: Standard frequency of 3 MHz. Power Supply: Operates on a single +5V supply. 40-pin Dual In-line Package (DIP). Slideshare 2. Architecture and Hardware Details microprocessor 8085 ppt by gaonkar new
Below is a breakdown of the three core units of this architecture:
: Covers the 8-bit internal data bus and 16-bit address bus (allowing 64KB memory addressing) Slideshare The 8085 Programming Model : Focuses on the Accumulator
) : Carries the lower-order address byte during the first clock cycle ( T1cap T sub 1 ) and the 8-bit data byte during subsequent cycles ( Higher-Order Address Bus ( An instruction lifecycle consists of three nested time
The 8085 features 5 distinct physical pins dedicated to processing hardware interrupts:
If you are an educator, build your PPT around Gaonkar’s chapter flow but inject modern visuals. If you are a student, insist on a PPT that explains why you need to demultiplex the bus, not just how .
(Pins 1 & 2): Connected to a crystal oscillator to drive the internal clock generator. The internal operating frequency is exactly half of the crystal frequency. 3. Internal Register Organization Gaonkar’s approach emphasizes that the 8085 is a
: Six 8-bit registers (B, C, D, E, H, L) that can be paired (BC, DE, HL) to act as 16-bit registers.
Whether building a new presentation from scratch or seeking to master the fundamentals of 8-bit computing, this comprehensive technical blueprint captures the ultimate structural layout, coding paradigms, and core components as taught in . 1. Fundamentals and Core Specifications of the 8085
: Treats I/O devices exactly like memory locations using 16-bit addresses. Standard data transfer instructions ( MOV , LDA ) are used. It reduces available memory address space but increases operational flexibility.