1

8TQFP

23

1

I NDEX

CORNER

34

42

43

40

41

6

5

4

44

3

2

26

25

28

27

24

18

19

20

21

22

P1.7

P1.6

P1.5

NC

7

8

9

10

11

12

13

14

15

16

17

29

30

39

38

37

36

35

33

32

31

NC

PSEN

ALE/PR OG

EA/VPP

(RX D )

P 3.0

P0.7

( A D 7 )

P2.6

(A14)

P0.6

( A D 6 )

P0.5

( A D 5 )

P0.4

( A D 4 )

()

P 3 . 2

INT0

(TX D )

P 3.1

(T1)

P 3 .5

()

P 3 . 3

INT1

(T0)

P 3 .4

P2.7

(A15)

RST

P2.5

(A13)

Features

Description

The AT87F51 is a low-power, high-performance CMOS 8-bit microcomputer with 4K

bytes of QuickFlash Programmable Read Only Memory. The device is manufactured

using Atmel’s high density nonvolatile memory technology and is compatible with the

industry standard MCS-51™ instruction set and pinout. The on-chip QuickFlash

allows the program memory to be user programmed by a conventional nonvolatile

memory programmer. By combining a versatile 8-bit CPU with QuickFlash on a mono-

lithic chip, the Atmel AT87F51 is a powerful microcomputer which provides a highly

flexible and cost effective solution to many embedded control applications.

PDIP

P1.0

P1.1

P0.0

( A D 0 )

P1.2

()

P 3 . 2

INT0

ALE/PR OG

()

P 3 . 7

RD

P2.3

(A11)

(TX D )

P 3.1

EA/VPP

()

P 3 . 6

WR

P2.4

(A12)

(RX D )

P 3.0

P0.7

( A D 7 )

(T1)

P 3 .5

P2.6

(A14)

RST

P0.6

( A D 6 )

P1.7

P0.5

( A D 5 )

P1.6

P0.4

( A D 4 )

P1.5

P0.3

( A D 3 )

P1.4

P0.2

( A D 2 )

P1.3

P0.1

( A D 1 )

()

P 3 . 3

INT1

PSEN

XTAL2

P 2.2

( A10)

(T0)

P 3 .4

P2.7

(A15)

XTAL1

P 2.1

( A9)

GND

P 2.0

( A 8 )

P2.5

(A13)

20

19

18

17

16

15

1

2

3

4

5

6

7

8

9

10

11

12

13

14

21

22

23

24

25

26

40

39

38

37

36

35

34

33

32

31

30

29

28

27

Rev. 1012A–02/98

(continued)

8-Bit

Microcontroller

with 4K Bytes

AT87F51

Not Recommended

for New Designs.

Use AT89S51.

Pin Configurations

PLCC

ALE/PR OG

EA/VPP

(RX D ) P 3.0

P0.7 ( A D 7 )

P2.6 (A14)

P0.6 ( A D 6 )

P0.5 ( A D 5 )

P0.4 ( A D 4 )

PSEN

() P 3 . 2

INT0

(TX D ) P 3.1

(T1) P 3 .5

() P 3 . 3

INT1

(T0) P 3 .4

P2.7 (A15)

23

1

RST

P1.7

P1.6

P1.5

I NDEX

CORNER

NC

P2.5 (A13)

34

NC

42

43

40

41

6

5

44 4

3

2

26

25

28

27

18

19

20

24

21

22

7

8

9

10

11

12

13

14

15

16

17

29

30

39

38

37

36

35

33

32

31