8085AH Pin

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SOSSAH/SOSSAH-21S0SSAH-1

S-BIT HMOS MICROPROCESSORS

•Single +SV Power Supply with 10% Voltage Margins

•3 MHz, S MHz and 6 MHz Selections Available

•20% Lower Power Consumption than SOSSA for 3 MHz and S MHz

•1.3 J-ts Instruction Cycle (SOSSAH); O.S J-ts (SOSSAH-2); 0.67 J-ts (SOSSAH-1)

•100% Compatible with SOSSA

•100% Software Compatible with 80S0A

•On-Chip Clock Generator (with External Crystal, LC or RC Network)

•On-Chip System Controller; Advanced Cycle Status Information Available for Large System Control

•Four Vectored Interrupt Inputs (One is Non-Maskable) Plus an SOSOA-Compatible Interrupt

•Serial In/Serial Out Port

•Decimal, Binary and Double Precision Arithmetic

•Direct Addressing Capability to 64K Bytes of Memory

•Available in EXPRESS

-Standard Temperature Range

-Extended Temperature Range

The Intel® 8085AH is a complete 8 bit parallel Central Processing Unit (CPU) implemented in N-channel, depletion load, silicon gate technology (HMOS). Its instruction set is 100% software compatible with the8080A microprocessor, and it is designed to improve the present 8080A'sperformance by higher system speed. Its high level of system integration allows a minimum system of three IC's[8085AH (CPU), 8156H (RAM/I 0) and 8355/8755A (ROM/PROM/IO)] while maintaining total system expandability. The 8085AH-2 and 8085AH-1 are faster versions of the 8085AH.

The 8085AH incorporates all of the features that the 8224 (clock generator) and 8228 (system controller) provided for the 8080A, thereby offering a high level of system integration.

The 8085AH uses a multiplexed data bus. The address is split betw~en the 8 bit address bus and the 8 bit data bus. The oli-chip address latches of 8155H/8156H/8355/8755A memory products allow a direct interface with the 8085AH.

tNi"

				Xl	Vee
				X2	HOLD
				RESET OUT	HlDA
				SOD	elK lOUT)
					RESET IN
					READY
					101M
					51
				RST 55	AD
				INTR	WR
				INTA	ALE
				ADO	So
				ADl	A15
POWER {_"'v				AD2	A14
POWER {_"'v				AD3	A13
SUPPLY -GND				AD4	A12
				AD5	All
				AD6	Al0
				AD7	Ag
				....__,.,J"""A8
X,
x,
		Als-Aa	AD7-ADO
	ADDRESS BUS		ADDR ESS/OATA BUS
				Figure 2.	8085AH Pin
	Figure 1. 8085AH CPU Functional Block Diagram			Configuration

Intel Corporation Assumes No Responsibilty for the Use of Any Circuitry Other Than Circuitry Embodied in an Intel Product. No Other Circuit Patent Licenses ale Implied.

'"INTELCORPORATION, 1981.

6-10

MCS-80/85 specifications

The Intel MCS-80/85 family, introduced in the late 1970s, is a seminal collection of microprocessors that played a pivotal role in the early days of computing. The MCS-80 series, initially targeting embedded systems and control applications, gained remarkable attention due to its innovative architecture and flexible programming capabilities.

The MCS-80 family is anchored by the 8080 microprocessor, which was one of the first fully integrated 8-bit microprocessors. Released in 1974, the 8080 operated at clock speeds ranging from 2 MHz to 3 MHz and featured a 16-bit address bus capable of addressing up to 64KB of memory. The processor’s instruction set included around 78 instructions, providing extensive capabilities for data manipulation, logic operations, and branching.

Complementing the 8080 was a suite of support chips, forming the MCS-80 platform. The most notable among them was the 8155, which integrated a static RAM, I/O ports, and a timer, tailored for ease of designing systems around the 8080. Other support chips included the 8085, which provided improvements with an integrated clock generator, making it compatible with more modern designs and applications.

The MCS-85 series, on the other hand, revolves around the 8085 microprocessor, which provided a more advanced architecture. The 8085 operated at clock speeds of up to 6 MHz and came with a 16-bit address bus, similar to its predecessor. However, it introduced more sophisticated features, including an enhanced instruction set and support for interrupt-driven programming. These enhancements made the 8085 especially appealing to developers working in real-time processing environments.

The MCS-80/85 family utilized NMOS technology, known for its lower power consumption and higher performance compared to previous technologies like TTL. The family’s architecture allowed for easy interfacing with a variety of peripherals, making it a favorite for educational institutions and hobbyists embarking on computer engineering projects.

With its robustness, versatility, and affordability, the Intel MCS-80/85 microprocessors laid the groundwork for many subsequent microcomputer systems and applications. The legacy of this powerful family continues to influence modern microprocessor design, emphasizing the importance of reliable architecture in a rapidly evolving technology landscape.

Intel MCS-80/85 manual 8085AH Pin, AH CPU Functional Block Diagram Configuration

Models: MCS-80/85

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SOSSAH/SOSSAH-21S0SSAH-1

S-BIT HMOS MICROPROCESSORS

Figure 1. 8085AH CPU Functional Block Diagram

Configuration

MCS-80/85 specifications