W741L250 datasheet(3/86 Pages) WINBOND

Part #	W741L250

Description	4-BIT MICROCONTROLLER

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Manufacturer	WINBOND [Winbond]

Direct Link	http://www.winbond.com

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W741L250

Publication Release Date: March 1998

- 3 -

Revision A2

• MFP output pin

− Output is software selectable as modulating or nonmodulating frequency

− Works as frequency output specified by Timer 1

• Built-in 14-bit clock frequency divider circuit

• Two built-in 8-bit programmable countdown timers

− Timer 0: One of two internal clock frequencies (FOSC/4 or FOSC/1024) can be selected

− Timer 1: Offers auto-reload function and one of two internal clock frequencies (FOSC or

FOSC/64) can be selected or falling edge of pin RC.0 can be selected (output through MFP pin)

• Built-in 18/14-bit watchdog timer selectable for system reset

• Powerful instruction set: 116 instructions

• 8-level subroutine (include interrupt) nesting

• Up to 4

µS instruction cycle (with 1 MHz operating frequency)

• Packaged in 64-pin QFP

PIN CONFIGURATION

51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

1

2 3

4

5

6 7

8

9 10 11 12 13 14 15 16 17 18 19

20

21

22

23

24

25

26

27

28

29

30

31

32

52

53

54

55

56

57

58

59

60

61

62

63

64

RD1

RD0

RC3

RC2

RC1

RC0

RB3

RB1

M

F

P

/

I

N

T

/

R

E

S

X

I

N

O

U

T

V

D N N

D C C

D

H

1

D

H

2

V

D

SEG18

SEG17

SEG16

SEG15

SEG14

SEG13

SEG12

SEG11

SEG10

R

E

2

R

E

3

V

S

N

C

N

C

O

M

C

O

M

C

O

M

C

O

M

S

E

G

S

E

G

S

E

G

S

E

G

S

E

G

S

E

G

3 2

1

0

0 1

2

3

4 5

R

D

E E

R R

R

2

3 0

1

S S S

E

E E

G G

E

G

2

1

0 9

G

SEG9

SEG8

SEG7

SEG6

RB0

RA3

RA2

RA

1

RB2

S

2

2 1

S

E

G

3

2

3

V

D

2

V

D

X

R

A

0

1

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