Микропроц техника / 4 курс_МТ_МСУД / 8051easy_manual

m i k r o E l e k t r o n i k a d e v e l o p m e n t s y s t e m s		8051easy
		development system

+5V

Picture 18.

P1.0

VCC

P1.1

P0.0

P1.2

P0.1

+5V

P1.3

P0.2

P1.4

P0.3

P1.5

P0.4

10K

P1.6

P0.5

P1.7

AT89S8252

P0.6

RESET

P0.7

P3.0

ICP

Reset

P3.1

ALE

P3.2

PSEN

D7

m i K r o e l e k t r o n i k a

+

P3.3

P2.7

D6

P3.4

P2.6

D5

P3.5

P2.5

D4

P3.6

P2.4

E

4MHz

P3.7

P2.3

RS

OSC2/CLKIN

P2.2

D7

D6

D5

D4

D3

D2

D1

D0

E R/W RS Vee Vdd Vss

1

OSC1/CLKIN

P2.1

+5V

GND

P2.0

KontrastLCD contrastLCD-a

1

1

8051

8051

Picture 19.

Picture 20.

LCD display connected to port 1.

LCD display connected to port 2.

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m i k r o E l e k t r o n i k a d e v e l o p m e n t s y s t e m s		8051easy
		development system

SEVEN-SEGMENT DISPLAYS

Seven-segment display consists of four digits which are refreshed and displayed using port 1 in combination with port 3. Using the DIP switch SW2, you can include or exclude the digits in use. For example, let’s say that we need to enable display of the first digit on the left. By turning the fourth switch (SW2) to (ON), digit of the seven-segment display (DIS1, leftmost digit) will be showing value defined by values of port 1 pins (picture 21.). Procedure is similar with digits DIS2, DIS3 and DIS4. The following picture shows how to connect the seven-segment display to the microcontroller.

Turn on switch Sw2 if you want to use displays

Picture 21.

P3.2

P3.3

P3.4

P3.5

SW2

			10ΚΩ		TR4
				10ΚΩ	TR3
					10ΚΩ
					TR2
ON					10ΚΩ
SW2						TR1
1	2	3		4
								g f K a b	g f K a b	g f K a b	g f K a b
								8 8 8 8
								e d K c dp	e d K c dp	e d K c dp	e d K c dp
					330Ω	h
					330Ω	g
					330Ω	f
					330Ω	e
					330Ω	d
					330Ω	c
					330Ω	b
					330Ω	a
								+5V
						P1.0		VCC
						P1.1		P0.0
						P1.2		P0.1
+5V						P1.3		P0.2
						P1.4		P0.3
						P1.5		P0.4
10K						P1.6		P0.5
						P1.7	AT89S8252	P0.6
						RESET		P0.7
						P3.0		ICP
Reset						P3.1		ALE
						P3.2		PSEN
						P3.3		P2.7
						P3.4		P2.6
						P3.5		P2.5
						P3.6		P2.4
					4MHz	P3.7		P2.3
						OSC2/CLKIN		P2.2
						OSC1/CLKIN		P2.1
						GND		P2.0			Picture 22.

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m i k r o E l e k t r o n i k a d e v e l o p m e n t s y s t e m s	8051easy

ANALOG-DIGITAL CONVERTER

Microcontroller AT89C8252, that can be used in the development system, doesn’t have implemented 10bit A/D coverter. That is why a 12-bit A/D converter LTC1290 is added to the system.

development system

It is possible to read values of

Moguæe je oèitavati

Picture 23. 8 analog inputs vrednosti 8 analognih ulaza

+

+

P1.4

P1.5

P1.6

If you want to read values of AD0, ..., AD7 inputs, it is neccessary to set the DIP switch SW4 in the position shown on the picture 23. Picture 24. shows how to connect A/D converter and the microcontroller.

				+5V
		OE	Vdd
22μF	+	NC	NC	10ΚΩ	10ΚΩ	10ΚΩ	10ΚΩ
		NC	NC
		GND	OUT

	4 MHZ
1ΚΩ	CH0	Vcc
	CH1	ACLK
+5V	CH2	SCLK
	CH3	Din
	CH4	Dout
	CH5	CS
	CH6	REF+
	CH7	REF-
	COM	V-
A/DUlaziconverterA/D	DGND	AGND
konvertorainputs	LTC1290
+12V	NC	NC
	Vin	NC
	NC	Vref
	GND	NC	4.7μF	+	+5V
	REF02
					10K

Reset

4MHz

								Picture 24.
	These switches have to be set to
	Ovi prekidaèi moraju biti u položaju
		in order to communicate with
	ON kako bi se moglo komunicirati sa
	A/D converter
	AD konvertorom
CS_AD 4					ON

MOSI	3
MISO	2
SCK	1
				+5V
P1.0			VCC
P1.1			P0.0
P1.2			P0.1
P1.3			P0.2				K A n a l :			5	+
P1.4			P0.3
									c o n V :
P1.5			P0.4				A / d				4 0 9 5
P1.6			P0.5
P1.7		AT89S8252	P0.6
RESET			P0.7	D7	D6	D5	D4 D3 D2 D1	D0	E R/W RS Vee Vdd Vss
P3.0			ICP							1
P3.1			ALE							+5V
P3.2			PSEN	D7
P3.3			P2.7								KontrastLCD contrastLCD-a
				D6
P3.4			P2.6
				D5
P3.5			P2.5
				D4
P3.6			P2.4
				E
P3.7			P2.3
				RS
OSC2/CLKIN			P2.2
OSC1/CLKIN			P2.1
GND			P2.0

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m i k r o E l e k t r o n i k a d e v e l o p m e n t s y s t e m s

RS232 COMMUNICATION

RS232 communication is used for communication between two devices within 10m distance. It is commonly used for data transfer with computer. Jumpers RX and TX select the pin which the communicaton will be attached to.

Picture 26. illustrates the connection between computer and the development system.

Serial connector from the

computer to RS232 commu-

Serijski konektor iz raèunara nicationza RS232 komunikaciju

If RS232 communication is used,

Ako se koristi RS232 komunikacija jumpers should be set to P3.0

potrebno je postaviti kratkospojnike and P3.1

na P3.0 i P3.1

	20	MAX232
	18
	17

+

+

+

+

Tr 6

P3.1

P0.3

8051easy

development system

Connector for RS232 communication of the microcontroller andKonektorthe computerza RS232(itkomunikacijuis not used

mikrokontrolera i racunara.

for programming the microcon-

(Ne koristi se za programiranje troller)

mikrokontrolera)

Picture 25.

					+5V		+5V			+5V
				22μF				P1.0		VCC
			C1+	Vcc			10K	P1.1		P0.0
		+						P1.2		P0.1
	F
	μ		V+	Vss
	10							P1.3		P0.2
9 pin SUB-D connector			C1-	T1out			Reset	P1.4		P0.3
SUB-D konektor 9 pinski
		+	C2+	R1in				P1.5		P0.4
			C2-	R1out				P1.6		P0.5
1	10Fμ		V-	16F84T1in	TX	P3.1		P1.7		P0.6
6
2	22μF		T2out	T2in				RESET	AT89S8252	P0.7
7
3			R2in	R2out				P3.0		ICP
8
					RX	P3.0
4			MAX232					P3.1		ALE
9
								P3.2		PSEN
5
								P3.3		P2.7
								P3.4		P2.6
								P3.5		P2.5
								P3.6		P2.4
							4MHz	P3.7		P2.3
								OSC2/CLKIN		P2.2
								OSC1/CLKIN		P2.1
								GND		P2.0
	serial cable
	serijski kabl
		(1(1naon1)1)
1
6	Receives data
2	prima podatke (Rx)
7	šaljeSendspodatkeata (Tx)(Tx)
3
8
4
9
5
										Picture 26.

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m i k r o E l e k t r o n i k a d e v e l o p m e n t s y s t e m s		8051easy
		development system

DIGITAL TERMOMETER DS1820

DS1820 digital termometer, with temperature range of -55 to 125 C, can be used for measuring enviroment temperature and also for experimenting. It is very accurate and easy to connect. It should be set in the 3-pin socket, beneath the power connector of the development system. Picture 27. shows how to connect digital termometer and the microcontroller on the development system.

+5V

RS

P1.0

VCC

+5V

DS1820

+125

P1.1

P0.0

CO

E

P1.2

P0.1

Vdd

DQ GND

P1.3

P0.2

-55

D4

P1.4

P0.3

P2.0

D5

P1.5

P0.4

D6

P1.6

P0.5

D7

P1.7

P0.6

+5V

AT89S8252

P3.6

4,7ΚΩ

RESET

P0.7

10K

P3.0

ICP

P3.1

ALE

Reset

P3.2

PSEN

P3.3

P2.7

P3.4

P2.6

P3.5

P2.5

P3.6

P2.4

4MHz

P3.7

P2.3

T e m p e r a t u r a

+

OSC2/CLKIN

P2.2

2 3 . 5 s t e p e n i c

OSC1/CLKIN

P2.1

GND

P2.0

D7

D6

D5

D4 D3 D2

D1 D0 E

R/W RS Vee Vdd Vss

1

+5V

LCD contrast

Kontrast LCD-a

Picture 27.

Digital temperature value is sent either to P3.6 or P2.0 pin, depending on the position of a jumper, set above DS1820 chip. Half-circle line drawn on the board marks the orientation of DS1820, when setting termometer in the socket.

P3.6

P2.0

Picture 28.

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m i k r o E l e k t r o n i k a d e v e l o p m e n t s y s t e m s		8051easy
		development system

PUL-UP / PULL-DOWN RESISTORS ON PORTS

Setting jumper to the upper position sets the pins of the appropriate port to logical one (pull-up). If jumper is set to the lower postion, pins are set to logical zero (pull-down).

Picture 29. illustrates the situation when the pins of port 0 are predefined to logical one. Graphic schemes are on the following pictures.

Picture 29.

Ω	5V						Ω
					GND
κ							κ
0							0
0	0	00κΩ	0	00κΩ	00κΩ	00κΩ	0
	0		0
P0.0	P0.1	P0.2	P0.3	P0.4	P0.5	P0.6	P0.7
	κ		κ
	Ω		Ω			Picture 30.

DIP system switches enable great flexibility. Through their use, port pins can be connected to various elements of the system:

SW2turn on / turn off seven-segment display digits. SW3turn on / turn off LED diodes on ports 0, 1 ,2 and 3.

SW4pins P1.4, P1.5, P1.6, P1.7 are connected to the appropriate pins of the exernal A/D converter LTC1290 of AVR-easy development sys tem.

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m i k r o E l e k t r o n i k a d e v e l o p m e n t s y s t e m s		8051easy
		development system

DIRECT ACCESS TO PORTS

All PIC pins can be defined as either input or output.

Port pins can be accessed directly from the right side of the development system by using the flat cable. This way, values from external elements can be transferred to ports, both ways.

Picture 32.

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