Temperature Sensor Code Contd | Intel MCS-80/85 instruction

1:,1

Temperature Sensor Code (Cont'd)

ISIs- II 8888/8885 Ift:RO		RSSEPllLER, Y2. 9
LOC OOJ	SEQ	5(U(CE STATEIENT
	53	;
2829 CD6828	54	CALL	fl>JUST	; caMRTS 8155 rom TO ~TlR. ~T

55;

		56;
		57 .;
		58;
282C	2E88	59
292E 2628		68
2839	88	61
2831	78	62
2832	8E91	63
2834	Cl>9228	64
		65;
		66;
		67.;
		68;
28373E88		69
2939	f()	78
283A	CM29	71
2930 3E98		72
293F	B9	n
2948	CfIl829	74
		75;

SETlf INITIILIZATI~ F~ SEARCH ROOTINE. ROOTINE LOOCS F~ TEIFERfITlRE RfNlE IF emn (SEE TEXT). SEARCH MV F~ Lfm< IR.F TO SIIRIFV COOE.

""I	L88H	; SET II. TO BEGII.UI«l IF SEARCH
""I	H,28H	; STRII«l IN IEIGV.
~	B	; CLE~ CARRV F~ ROUTINE.
I«lY	A,B	; PUM:E B INTO ACCtJU..AT~
""I	e,iH	; SET TIlES ~ SEARCH
CALL	SEARCH	; LOOCS F~ TEfF RAta: rom IS IN

Cl£eI( IF SEARCH IfIS SOCCESSfU.. IF NOT TI£N OUTSIDE InEPTABLE

RfNE.

""I	A,88H	; DID L FIN> LESS 1WW AT
XRA	l	; AT. BEGIIfHI«l IF STRII«l?
JZ	TL~	; TEfF BEL~ ILLMD Ll"ITS, SET ~l A
""I	fl.llllH	; DID e GET DECRB£NTED?
CIF	e	; IF SO, SEARCH DID NOT FIN>
JZ	lHlGH	; TEfF fIB(M LI"ITS, SET ~l B

76 ; 5(fTIftE IIAP TIE IftTCH TO A TEIFERfIME IN DEGREES C BV fl>Dll«l n; 18 TO SEARCH fl>DRESS PLtU TEIflERATlft IN REGISTER E.

		78;
2943	JEeR	79	""I	A,8fIl	; SHIFT II. BV 11l (S!FT1ftE 1flP)
2945	85	88	ADD	L
2946 6F'		81	I«lY	LA
28475E		82	I«lY	E,"	; REfI> IN TEIflERAME
		83	;

		84;
		85;
		86;
		87;
2848	9689	88
284A eD6C82		89
2840	3E98	98
294F	Cl>B782	91
2852	l1FF911	92
2955	CDF185	93
2858	CF	94
		95;

SET If INITIALIZATION F~ DISPLAVII«l TElFERATlft USII«l SOl( I()NIT~ ROOTINES. FIRST EXPAIIi DE REGISTER AN) TIEN DISPLAV F~ OELAV PER I00.

""I	B,88H	; CLEAR DOT AT fl>DRESS FIELD
(;ALL	HXl)SP	; CILL EXPAI()
""1	A,8(!H
CALL	OUTPUT	; \)JTPUT TO SOl( DISPLAV
LXI	D,8FFH	; SET DELAY PERIOD
CILL	DELAY	; DIg>LAV F~ DElAY PERIOO
RST	1	;5(FTIfIRE RESTAI<T

		96	.; stmJUTlNES
		97;
28ff"		98011G		28AFH
		99;
		1911	;
29AF	3Efj}	191	TlOW	11\11	A,83H
2f.IB1	D329	192		ooT	29H
2883	3EFF	193		""I	A,9FFH	; SET PORT A AS 1'5
2885	D321	184		OUT	21H
2887 CF		195		RST	1
		186	;
		1fj7	;

A1-45

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 Temperature Sensor Code Contd

Models: MCS-80/85

Temperature Sensor Code (Cont'd)

CALL

fl>JUST

; caMRTS 8155 rom TO ~TlR. ~T

2948

CfIl829

CALL

SEARCH

; DID L FIN> LESS 1WW AT

; IF SO, SEARCH DID NOT FIN>

lHlGH

; TEfF fIB(M LI"ITS, SET ~l B

ADD

RST

MCS-80/85 specifications