VMX51C900-25-PG datasheet(5/55 Pages) ETC1

Part #	VMX51C900-25-PG

Description	Versa Mix 8051 MCU with LCD Controller and ADC

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Manufacturer	ETC1 [List of Unclassifed Manufacturers]

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VMX51C900

_______________________________________________________________________________________________

www.ramtron.com

page 5 of 55

DIP-40 Pin Descriptions

TABLE 3: VMX51C900 PIN DESCRIPTIONS FOR DIP40 PACKAGE

DIP -

40

Name

I/O

Function

T2

I

Timer 2 Clock Out

1

P1.0

I/O

Bit 0 of Port 1

T2EX

I

Timer 2 Control

2

P1.1

I/O

Bit 1 of Port 1

P1.2

I/O

Bit 2 of Port 1

3

PWMA

O

PWM Channel A

4

P1.3

I/O

Bit 3 of Port 1

5

P1.4

I/O

Bit 4 of Port 1

PWMB

O

PWM Channel B

6

P1.5

I/O

Bit 5 of Port 1

7

P1.6

I/O

Bit 6 of Port 1

8

P1.7

I/O

Bit 7 of Port 1

9

RES

I

Reset

RXD

I

Receive Data

10

P3.0

I/O

Bit 0 of Port 3

TXD

O

Transmit Data &

11

P3.1

I/O

Bit 1 of Port 3

#INT0

I

External Interrupt 0

12

P3.2

I/O

Bit 2 of Port 3

#INT1

I

External Interrupt 1

13

P3.3

I/O

Bit 3 of Port 3

ADCIN0

Ain

ADC input 0

T0

I

Timer 0

14

P3.4

I/O

Bit 4 of Port 3

ADCIN1

Ain

ADC input 1

T1

I

Timer 1 & 3

15

P3.5

I/O

Bit 5 of Port

ADCIN2

Ain

ADC input 2

#WR

O

Ext. Memory Write

16

P3.6

I/O

Bit 6 of Port 3

ADCIN3

Ain

ADC input 3

#RD

O

Ext. Memory Read

17

P3.7

I/O

Bit 7 of Port 3

18

XTAL2

O

Oscillator/Crystal Output

19

XTAL1

I

Oscillator/Crystal In

20

VSS

-

Ground

LCDCOM0

-

LCD Driver Common 0

P2.0

I/O

Bit 0 of Port 2

21

A8

O

Bit 8 of Ext. Memory Address

LCDCOM1

-

LCD Driver Common 1

P2.1

I/O

Bit 1 of Port 2

22

A9

O

Bit 9 of Ext. Memory Address

LCDCOM2

-

LCD Driver Common 2

P2.2

I/O

Bit 2 of Port 2

23

A10

O

Bit 10 of Ext. Memory Address

LCDCOM3

-

LCD Driver Common 3

P2.3

I/O

Bit 3 of Port 2 &

24

A11

O

Bit 11 of Ext. Memory Address

LCDSEG0

-

LCD Segment 0

P2.4

I/O

Bit 4 of Port 2

25

A12

O

Bit 12 of Ext. Memory Address

LCDSEG1

-

LCD Segment 1

P2.5

I/O

Bit 5 of Port 2

26

A13

O

Bit 13 of External Memory Address

LCDSEG2

-

LCD Segment 2

P2.6

I/O

Bit 6 of Port 2

27

A14

O

Bit 14 of External Memory Address

PLCC

- 44

Name

I/O

Function

LCDSEG3

-

LCD Segment 3

P2.7

I/O

Bit 7 of Port 2

28

A15

O

Bit 15 of External Memory Address

LCDSEG4

-

LCD Segment 4

29

#PSEN

O

Program Store Enable

LCDSEG5

-

LCD Segment 5

30

ALE

O

Address Latch Enable

31

#EA

I

External Access

LCDSEG6

-

LCD Segment 6

P0.7

I/O

Bit 7 Of Port 0

32

AD7

I/O

Data/Address Bit 7 of Ext. Memory

LCDSEG7

-

LCD Segment 7

P0.6

I/O

Bit 6 of Port 0

33

AD6

I/O

Data/Address Bit 6 of Ext. Memory

LCDSEG8

-

LCD Segment 8

P0.5

I/O

Bit 5 of Port 0

34

AD5

I/O

Data/Address Bit 5 of Ext. Memory

LCDSEG9

-

LCD Segment 9

P0.4

I/O

Bit 4 of Port 0

35

AD4

I/O

Data/Address Bit 4 of Ext. Memory

LCDSEG10

-

LCD Segment 10

P0.3

I/O

Bit 3 Of Port 0

36

AD3

I/O

Data/Address Bit 3 of Ext. Memory

LCDSEG11

-

LCD Segment 11

P0.2

I/O

Bit 2 of Port 0

37

AD2

I/O

Data/Address Bit 2 of Ext. Memory

LCDSEG12

-

LCD Segment 12

P0. 1

I/O

Bit 1 of Port 0 & Data

38

AD1

I/O

Address Bit 1 of Ext. Memory

LCDSEG13

-

LCD Segment 13

P0.0

I/O

Bit 0 Of Port 0 & Data

39

AD0

I/O

Address Bit 0 of Ext. Memory

40

VDD

-

5V supply

T2 / P1.0

T2EX / P1.1

PWMA / P1.2

P1.3

P1.4

PWMB / P1.5

P1.6

P1.7

RESET

RXD / P3.0

TXD / P3.1

#INT0 / P3.2

#INT1 / P3.3

ADCIN0 / T0 / P3.4

ADCIN1 / T1 / P3.5

ADCIN2 / #WR / P3.6

ADCIN3 / #RD / P3.7

XTAL2

XTAL1

VSS

VMX51C900

DIP-40

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

40

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

24

23

22

21

VDD

P0.0 / AD0 / LCDSEG13

P0.1 / AD1 / LCDSEG12

P0.2 / AD2 / LCDSEG11

P0.3 / AD3 / LCDSEG10

P0.4 / AD4 / LCDSEG9

P0.5 / AD5 / LCDSEG8

P0.6 / AD6 / LCDSEG7

P0.7 / AD7 / LCDSEG6

#EA / VPP

ALE / LCDSEG5

PSEN / LCDSEG4

P2.7 / A15 / LCDSEG3

P2.6 / A14 / LCDSEG2

P2.5 / A13 / LCDSEG1

P2.4 / A12 / LCDSEG0

P2.3 / A11 / LCDCOM3

P2.2 / A10 / LCDCOM2

P2.1 / A9 / LCDCOM1

P2.0 / A8 / LCDCOM0

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