~

IN o

 

 

 

 

THERMISTOR

(.7) (.1,u) (RT)

START WITH 3FFEH

DEG.C

OHMS

APPROX. TIME (ms)

APPROX. COUNT LEFT (HEX)

 

 

 

 

 

 

 

 

20

 

12,490

.874

3585

 

 

 

 

 

 

 

 

 

21

 

11,940

.836

35FA

 

 

 

 

 

 

 

 

22

 

11,420

.799

366A

 

 

 

 

 

 

 

 

23

 

10,920

.764

3605

 

 

 

 

 

 

 

 

 

24

 

10,450

.732

373A

 

 

 

 

 

 

 

 

25

 

10,000

.7

3772

 

 

 

 

 

 

 

 

 

26

 

9,573

.670

3700

 

27

 

9,167

.642

3840

 

 

 

 

 

 

 

 

 

28

 

8,777

.614

38A1

 

 

 

 

 

 

 

 

29

 

8,407

.588

38F1

 

 

 

 

 

 

 

 

 

30

 

8,057

.564

393C

31

 

7,723

.541

3984

 

 

 

 

 

 

 

 

 

32

 

7,403

.518

39C8

 

 

 

 

 

 

 

33

 

7,097

.497

3AOA

 

 

 

 

 

 

 

 

34

 

6,807

.476

3A48

 

35

 

6,530

.457

3A84

36

 

6,267

.439

3ABC

 

 

 

 

 

 

37

 

6,017

.421

3AF2

 

 

 

 

 

 

38

 

5,747

.402

3B2C

 

 

 

 

 

 

39

 

5,547

.388

3B57

 

40

 

5,327

.373

3B86

 

41

 

5,117

.358

3BB3

-

 

 

 

 

 

8085A Cycle Time = 326 ns

Oneshot Approx. Time =

LN2 (CEXT) (REXT)

""(.7) (.1,u) RTHERMISTOR

Table 8. Thermistor Resistance Mapping

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- -~-c"""'-=

Page 171
Image 171
Intel MCS-80/85 manual Thermistor Resistance Mapping, ~.,.-~

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.